[NOT] EXISTS to IN transformation.

27 files changed, 9578 insertions, 133 deletions

diff --git a/mysql-test/r/mysqld--help.result b/mysql-test/r/mysqld--help.result
index cff5b49191f..d29631eabc0 100644
--- a/mysql-test/r/mysqld--help.result
+++ b/mysql-test/r/mysqld--help.result
@@ -498,8 +498,8 @@ The following options may be given as the first argument:
  mrr_cost_based, mrr_sort_keys, optimize_join_buffer_size,
  outer_join_with_cache, partial_match_rowid_merge,
  partial_match_table_scan, semijoin, semijoin_with_cache,
- subquery_cache, table_elimination, extended_keys } and
- val is one of {on, off, default}
+ subquery_cache, table_elimination, extended_keys,
+ exists_to_in } and val is one of {on, off, default}
  --performance-schema 
  Enable the performance schema.
  --performance-schema-events-waits-history-long-size=# 
diff --git a/mysql-test/r/subselect_exists2in.result b/mysql-test/r/subselect_exists2in.result
new file mode 100644
index 00000000000..dc229146a90
--- /dev/null
+++ b/mysql-test/r/subselect_exists2in.result
@@ -0,0 +1,865 @@
+drop table if exists t1,t2,t3;
+set optimizer_switch='exists_to_in=on';
+#
+# LP BUG#884644 exists2in broke name resolution
+#
+CREATE TABLE t1 (f1 integer);
+SELECT * FROM t1 WHERE EXISTS (SELECT NO_SUCH_TABLE.NO_SUCH_FIELD FROM t1);
+ERROR 42S22: Unknown column 'NO_SUCH_TABLE.NO_SUCH_FIELD' in 'field list'
+drop table t1;
+#
+# LP BUG#884657 Wrong result with exists2in , correlated subquery
+#
+CREATE TABLE t1 ( a varchar(1)) ;
+INSERT INTO t1 VALUES ('c'),('b');
+CREATE TABLE t2 ( b varchar(1)) ;
+INSERT INTO t2 VALUES ('v'),('v'),('c'),(NULL),('x'),('i'),('e'),('p'),('s'),('j'),('z'),('c'),('a'),('q'),('y'),(NULL),('r'),('v'),(NULL),('r');
+CREATE TABLE t3 ( a int NOT NULL , b varchar(1)) ;
+INSERT INTO t3 VALUES (29,'c');
+SELECT *
+FROM t1, t2
+WHERE EXISTS (
+SELECT a
+FROM t3
+WHERE t3.b = t1.a
+AND t3.b <> t2.b
+);
+a	b
+c	v
+c	v
+c	x
+c	i
+c	e
+c	p
+c	s
+c	j
+c	z
+c	a
+c	q
+c	y
+c	r
+c	v
+c	r
+INSERT INTO t3 VALUES (2,'c');
+alter table t1 add index aa (a);
+alter table t3 add index bb (b);
+-- EXIST to IN then semijoin (has priority over IN to EXISTS)
+set optimizer_switch='exists_to_in=on,in_to_exists=on,semijoin=on,materialization=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+a
+c
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	aa	aa	4	NULL	2	100.00	Using index
+1	PRIMARY	t3	ALL	bb	NULL	NULL	NULL	2	100.00	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3`) where (`test`.`t3`.`b` = `test`.`t1`.`a`)
+-- EXIST to IN then IN to EXISTS
+set optimizer_switch='exists_to_in=on,in_to_exists=on,semijoin=off,materialization=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+a
+c
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	aa	4	NULL	2	100.00	Using where; Using index
+2	DEPENDENT SUBQUERY	t3	ALL	bb	NULL	NULL	NULL	2	100.00	Using where
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,<exists>(select `test`.`t3`.`b` from `test`.`t3` where (<cache>(`test`.`t1`.`a`) = `test`.`t3`.`b`)))
+-- EXIST2IN then MATERIALIZATION
+set optimizer_switch='exists_to_in=on,in_to_exists=off,semijoin=off,materialization=on,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+a
+c
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	aa	4	NULL	2	100.00	Using where; Using index
+2	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t3`.`b` from `test`.`t3` where 1 ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `<subquery2>`.`b`)))))
+-- NO EXIST2IN
+set optimizer_switch='exists_to_in=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+a
+c
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	aa	4	NULL	2	100.00	Using where; Using index
+2	DEPENDENT SUBQUERY	t3	ALL	bb	NULL	NULL	NULL	2	100.00	Using where
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where exists(select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`b` = `test`.`t1`.`a`))
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+drop table t1,t2,t3;
+# 
+# From group_min_max.test
+# 
+create table t1 (
+a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(64) default ' '
+);
+insert into t1 (a1, a2, b, c, d) values
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
+('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
+('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
+('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
+('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'),
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
+('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
+('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
+('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
+('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4');
+create index idx_t1_0 on t1 (a1);
+create index idx_t1_1 on t1 (a1,a2,b,c);
+create index idx_t1_2 on t1 (a1,a2,b);
+analyze table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	Table is already up to date
+create table t2 (
+a1 char(64), a2 char(64) not null, b char(16), c char(16), d char(16), dummy char(64) default ' '
+);
+insert into t2 select * from t1;
+insert into t2 (a1, a2, b, c, d) values
+('a','a',NULL,'a777','xyz'),('a','a',NULL,'a888','xyz'),('a','a',NULL,'a999','xyz'),
+('a','a','a',NULL,'xyz'),
+('a','a','b',NULL,'xyz'),
+('a','b','a',NULL,'xyz'),
+('c','a',NULL,'c777','xyz'),('c','a',NULL,'c888','xyz'),('c','a',NULL,'c999','xyz'),
+('d','b','b',NULL,'xyz'),
+('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),
+('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),
+('a','a',NULL,'a777','xyz'),('a','a',NULL,'a888','xyz'),('a','a',NULL,'a999','xyz'),
+('a','a','a',NULL,'xyz'),
+('a','a','b',NULL,'xyz'),
+('a','b','a',NULL,'xyz'),
+('c','a',NULL,'c777','xyz'),('c','a',NULL,'c888','xyz'),('c','a',NULL,'c999','xyz'),
+('d','b','b',NULL,'xyz'),
+('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),
+('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz');
+create index idx_t2_0 on t2 (a1);
+create index idx_t2_1 on t2 (a1,a2,b,c);
+create index idx_t2_2 on t2 (a1,a2,b);
+analyze table t2;
+Table	Op	Msg_type	Msg_text
+test.t2	analyze	status	Table is already up to date
+create table t3 (
+a1 char(1), a2 char(1), b char(1), c char(4) not null, d char(3), dummy char(1) default ' '
+);
+insert into t3 (a1, a2, b, c, d) values
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
+insert into t3 (a1, a2, b, c, d) values
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
+insert into t3 (a1, a2, b, c, d) values
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
+insert into t3 (a1, a2, b, c, d) values
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
+create index idx_t3_0 on t3 (a1);
+create index idx_t3_1 on t3 (a1,a2,b,c);
+create index idx_t3_2 on t3 (a1,a2,b);
+analyze table t3;
+Table	Op	Msg_type	Msg_text
+test.t3	analyze	status	Table is already up to date
+explain select a1,a2,b,c,min(c), max(c) from t1
+where exists ( select * from t2
+where t2.c in (select c from t3 where t3.c > t1.b) and
+t2.c > 'b1' )
+group by a1,a2,b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	index	NULL	idx_t1_1	163	NULL	128	Using where; Using index
+2	DEPENDENT SUBQUERY	t2	index	NULL	idx_t2_1	163	NULL	164	Using where; Using index
+2	DEPENDENT SUBQUERY	t3	index	NULL	idx_t3_1	10	NULL	192	Using where; Using index; FirstMatch(t2); Using join buffer (flat, BNL join)
+select a1,a2,b,c,min(c), max(c) from t1
+where exists ( select * from t2
+where t2.c in (select c from t3 where t3.c > t1.b) and
+t2.c > 'b1' )
+group by a1,a2,b;
+a1	a2	b	c	min(c)	max(c)
+a	a	a	a111	a111	d111
+a	a	b	e112	e112	h112
+a	b	a	i121	i121	l121
+a	b	b	m122	m122	p122
+b	a	a	a211	a211	d211
+b	a	b	e212	e212	h212
+b	b	a	i221	i221	l221
+b	b	b	m222	m222	p222
+c	a	a	a311	a311	d311
+c	a	b	e312	e312	h312
+c	b	a	i321	i321	l321
+c	b	b	m322	m322	p322
+d	a	a	a411	a411	d411
+d	a	b	e412	e412	h412
+d	b	a	i421	i421	l421
+d	b	b	m422	m422	p422
+explain select a1,a2,b,c,min(c), max(c) from t1
+where exists ( select * from t2
+where t2.c in (select c from t3 where t3.c > t1.c) and
+t2.c > 'b1' )
+group by a1,a2,b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	index	NULL	idx_t1_1	163	NULL	128	Using where; Using index
+2	DEPENDENT SUBQUERY	t2	index	NULL	idx_t2_1	163	NULL	164	Using where; Using index
+2	DEPENDENT SUBQUERY	t3	index	NULL	idx_t3_1	10	NULL	192	Using where; Using index; FirstMatch(t2); Using join buffer (flat, BNL join)
+select a1,a2,b,c,min(c), max(c) from t1
+where exists ( select * from t2
+where t2.c in (select c from t3 where t3.c > t1.c) and
+t2.c > 'b1' )
+group by a1,a2,b;
+a1	a2	b	c	min(c)	max(c)
+a	a	a	a111	a111	d111
+a	a	b	e112	e112	h112
+a	b	a	i121	i121	l121
+a	b	b	m122	m122	p122
+b	a	a	a211	a211	d211
+b	a	b	e212	e212	h212
+b	b	a	i221	i221	l221
+b	b	b	m222	m222	p222
+c	a	a	a311	a311	d311
+c	a	b	e312	e312	h312
+c	b	a	i321	i321	l321
+c	b	b	m322	m322	o322
+d	a	a	a411	a411	d411
+d	a	b	e412	e412	h412
+d	b	a	i421	i421	l421
+d	b	b	m422	m422	o422
+drop table t1, t2, t3;
+CREATE TABLE t1 ( a INT );
+INSERT INTO t1 VALUES (7),(0);
+CREATE TABLE t2 ( b INT );
+INSERT INTO t2 VALUES (0),(8);
+SELECT * FROM t1 WHERE
+EXISTS ( SELECT * FROM t2 WHERE b = a )
+OR a > 0;
+a
+7
+0
+explain extended
+SELECT * FROM t1 WHERE
+EXISTS ( SELECT * FROM t2 WHERE b = a )
+OR a > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where (<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`b` from `test`.`t2` where 1 ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `<subquery2>`.`b`)))))) or (`test`.`t1`.`a` > 0))
+drop tables t1,t2;
+CREATE TABLE t1 ( a INT );
+INSERT INTO t1 VALUES (1),(5);
+CREATE TABLE t2 ( b INT ) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (1);
+CREATE TABLE t3 ( c INT );
+INSERT INTO t3 VALUES (4),(5);
+SET optimizer_switch='exists_to_in=on,subquery_cache=off,materialization=on,in_to_exists=off,semijoin=off';
+explain extended
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	1	100.00	
+3	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+Warnings:
+Note	1276	Field or reference 'test.t2.b' of SELECT #3 was resolved in SELECT #2
+Note	1003	select (select 1 from dual where (not(((1 is not null) and <in_optimizer>(1,1 in ( <materialize> (select `test`.`t3`.`c` from `test`.`t3` where (`test`.`t3`.`c` is not null) ), <primary_index_lookup>(1 in <temporary table> on distinct_key where ((1 = `<subquery3>`.`c`))))))))) AS `( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) )` from `test`.`t1`
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) )
+1
+1
+SET optimizer_switch='exists_to_in=on,subquery_cache=off';
+explain extended
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	1	100.00	
+3	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+Warnings:
+Note	1276	Field or reference 'test.t2.b' of SELECT #3 was resolved in SELECT #2
+Note	1003	select (select 1 from dual where (not(((1 is not null) and <in_optimizer>(1,1 in ( <materialize> (select `test`.`t3`.`c` from `test`.`t3` where (`test`.`t3`.`c` is not null) ), <primary_index_lookup>(1 in <temporary table> on distinct_key where ((1 = `<subquery3>`.`c`))))))))) AS `( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) )` from `test`.`t1`
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) )
+1
+1
+SET optimizer_switch='exists_to_in=off,subquery_cache=off';
+explain extended
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	1	100.00	
+3	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+Warnings:
+Note	1276	Field or reference 'test.t2.b' of SELECT #3 was resolved in SELECT #2
+Note	1003	select (select 1 from dual where (not(exists(select `test`.`t3`.`c` from `test`.`t3` where (`test`.`t3`.`c` = 1))))) AS `( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) )` from `test`.`t1`
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) )
+1
+1
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+drop table t1,t2,t3;
+# multi condition test
+CREATE TABLE t1 ( a varchar(1), a1 varchar(1)) ;
+INSERT INTO t1 VALUES ('c', 'c'), ('b', 'b');
+CREATE TABLE t3 ( a int NOT NULL , b varchar(1), b1 varchar(1)) ;
+INSERT INTO t3 VALUES (29,'c','c');
+INSERT INTO t3 VALUES (2,'c','c');
+alter table t1 add index aa (a,a1);
+alter table t3 add index bb (b,b1);
+-- EXIST to IN then semijoin (has priority over IN to EXISTS)
+set optimizer_switch='exists_to_in=on,in_to_exists=on,semijoin=on,materialization=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+a	a1
+c	c
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t3	index	bb	bb	8	NULL	2	100.00	Using where; Using index; LooseScan
+1	PRIMARY	t1	ref	aa	aa	8	test.t3.b,test.t3.b1	2	100.00	Using index
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.t1.a1' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`a1` AS `a1` from `test`.`t1` semi join (`test`.`t3`) where ((`test`.`t1`.`a1` = `test`.`t3`.`b1`) and (`test`.`t1`.`a` = `test`.`t3`.`b`))
+-- EXIST to IN then IN to EXISTS
+set optimizer_switch='exists_to_in=on,in_to_exists=on,semijoin=off,materialization=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+a	a1
+c	c
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	aa	8	NULL	2	100.00	Using where; Using index
+2	DEPENDENT SUBQUERY	t3	index_subquery	bb	bb	8	func,func	2	100.00	Using index; Using where
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.t1.a1' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`a1` AS `a1` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a`,`test`.`t1`.`a1`),<exists>(<index_lookup>(<cache>(`test`.`t1`.`a`) in t3 on bb where ((<cache>(`test`.`t1`.`a`) = `test`.`t3`.`b`) and (<cache>(`test`.`t1`.`a1`) = `test`.`t3`.`b1`)))))
+-- EXIST2IN then MATERIALIZATION
+set optimizer_switch='exists_to_in=on,in_to_exists=off,semijoin=off,materialization=on,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+a	a1
+c	c
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	aa	8	NULL	2	100.00	Using where; Using index
+2	MATERIALIZED	t3	index	NULL	bb	8	NULL	2	100.00	Using index
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.t1.a1' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`a1` AS `a1` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a`,`test`.`t1`.`a1`),(`test`.`t1`.`a`,`test`.`t1`.`a1`) in ( <materialize> (select `test`.`t3`.`b`,`test`.`t3`.`b1` from `test`.`t3` where 1 ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `<subquery2>`.`b`) and (`test`.`t1`.`a1` = `<subquery2>`.`b1`)))))
+-- NO EXIST2IN
+set optimizer_switch='exists_to_in=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+a	a1
+c	c
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	aa	8	NULL	2	100.00	Using where; Using index
+2	DEPENDENT SUBQUERY	t3	ref	bb	bb	8	test.t1.a,test.t1.a1	2	100.00	Using index
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.t1.a1' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`a1` AS `a1` from `test`.`t1` where exists(select 1 from `test`.`t3` where ((`test`.`t3`.`b` = `test`.`t1`.`a`) and (`test`.`t3`.`b1` = `test`.`t1`.`a1`)))
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+drop table t1,t3;
+#
+# MDEV-159 Assertion about not marked for read failed in
+# String* Field_varstring::val_str(String*, String*)
+#
+SET optimizer_switch = REPLACE( @@optimizer_switch, '=on', '=off' );
+SET optimizer_switch='in_to_exists=on,exists_to_in=on';
+CREATE TABLE t1 ( a VARCHAR(1) );
+INSERT INTO t1 VALUES ('k'),('m');
+CREATE TABLE t2 ( b INT,
+c VARCHAR(1),
+d VARCHAR(1) NOT NULL );
+INSERT INTO t2 VALUES 
+(4,'j','j'),(6,'v','v');
+CREATE ALGORITHM=MERGE VIEW v AS SELECT * FROM t2 WHERE b < 1;
+SELECT c FROM v  
+WHERE EXISTS ( 
+SELECT * FROM t1, t2 
+WHERE a <= v.d AND b = v.b 
+);
+c
+explain extended
+SELECT c FROM v  
+WHERE EXISTS ( 
+SELECT * FROM t1, t2 
+WHERE a <= v.d AND b = v.b 
+);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1276	Field or reference 'v.d' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'v.b' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t2`.`c` AS `c` from `test`.`t2` where (<in_optimizer>(`test`.`t2`.`b`,<exists>(select `test`.`t2`.`b` from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`a` <= `test`.`t2`.`d`) and (<cache>(`test`.`t2`.`b`) = `test`.`t2`.`b`)))) and (`test`.`t2`.`b` < 1))
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+drop view v;
+drop table t1,t2;
+#
+# MDEV-160 Exists2In: Crash in in hp_movelink with subquery_cache=ON
+#
+SET optimizer_switch = 'in_to_exists=on,subquery_cache=on,exists_to_in=on';
+CREATE TABLE t1 (  
+a VARCHAR(3) NOT NULL,  
+b VARCHAR(50)
+);
+INSERT INTO t1 VALUES 
+('USA','Chinese'),('USA','English'),
+('FRA','French'),('ITA','Italian');
+CREATE TABLE t2 ( c VARCHAR(3) );
+INSERT INTO t2 VALUES ('USA'),('FRA');
+SELECT * FROM t1 AS alias1, t1 AS alias2 
+WHERE EXISTS ( 
+SELECT * FROM t1, t2 
+WHERE a <= alias2.a AND c = alias1.b 
+) OR alias1 .a = 'foo';
+a	b	a	b
+SELECT * FROM t1 AS alias1, t1 AS alias2 
+WHERE EXISTS ( 
+SELECT * FROM t1, t2 
+WHERE a <= alias2.a AND c = alias1.a 
+) OR alias1 .a = 'foo';
+a	b	a	b
+USA	Chinese	USA	Chinese
+USA	English	USA	Chinese
+FRA	French	USA	Chinese
+USA	Chinese	USA	English
+USA	English	USA	English
+FRA	French	USA	English
+USA	Chinese	FRA	French
+USA	English	FRA	French
+FRA	French	FRA	French
+USA	Chinese	ITA	Italian
+USA	English	ITA	Italian
+FRA	French	ITA	Italian
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+#
+# MDEV-160 Exists2In: Crash in in hp_movelink with subquery_cache=ON
+#
+SET optimizer_switch = 'in_to_exists=on,subquery_cache=on,exists_to_in=on';
+CREATE TABLE t1 (  
+a VARCHAR(3) NOT NULL,  
+b VARCHAR(50)
+);
+INSERT INTO t1 VALUES 
+('USA','Chinese'),('USA','English'),
+('FRA','French'),('ITA','Italian');
+CREATE TABLE t2 ( c VARCHAR(3) );
+INSERT INTO t2 VALUES ('USA'),('FRA');
+SELECT * FROM t1 AS alias1, t1 AS alias2 
+WHERE EXISTS ( 
+SELECT * FROM t1, t2 
+WHERE a <= alias2.a AND c = alias1.b 
+) OR alias1 .a = 'foo';
+a	b	a	b
+explain extended
+SELECT * FROM t1 AS alias1, t1 AS alias2 
+WHERE EXISTS ( 
+SELECT * FROM t1, t2 
+WHERE a <= alias2.a AND c = alias1.b 
+) OR alias1 .a = 'foo';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	alias1	ALL	NULL	NULL	NULL	NULL	4	100.00	
+1	PRIMARY	alias2	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where; Using join buffer (flat, BNL join)
+2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1276	Field or reference 'test.alias2.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.alias1.b' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`alias1`.`a` AS `a`,`test`.`alias1`.`b` AS `b`,`test`.`alias2`.`a` AS `a`,`test`.`alias2`.`b` AS `b` from `test`.`t1` `alias1` join `test`.`t1` `alias2` where (<expr_cache><`test`.`alias1`.`b`,`test`.`alias2`.`a`>(<in_optimizer>(`test`.`alias1`.`b`,<exists>(select `test`.`t2`.`c` from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`a` <= `test`.`alias2`.`a`) and (<cache>(`test`.`alias1`.`b`) = `test`.`t2`.`c`))))) or (`test`.`alias1`.`a` = 'foo'))
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+#
+# MDEV-245 Exists2In: Wrong result (extra rows) with
+# exists_to_in=ON, materialization=OFF, NOT EXISTS subquery
+#
+SET optimizer_switch='materialization=off,exists_to_in=on';
+CREATE TABLE t1 ( a INT ) ;
+INSERT INTO t1 VALUES (0),(8),(1);
+CREATE TABLE t2 ( b INT ) ;
+INSERT INTO t2 VALUES (1),(2),(3);
+SELECT * FROM t1 WHERE NOT EXISTS ( SELECT * FROM t2 WHERE b = a );
+a
+0
+8
+explain extended
+SELECT * FROM t1 WHERE NOT EXISTS ( SELECT * FROM t2 WHERE b = a );
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where (not(((`test`.`t1`.`a` is not null) and <expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,<exists>(select `test`.`t2`.`b` from `test`.`t2` where ((`test`.`t2`.`b` is not null) and (<cache>(`test`.`t1`.`a`) = `test`.`t2`.`b`))))))))
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+#
+# MDEV-243 Wrong result (extra or missing rows) with
+# exists_to_in + materialization, EXISTS subquery
+#
+SET optimizer_switch='index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=on';
+CREATE TABLE t1 ( a VARCHAR(1), b VARCHAR(1) );
+INSERT INTO t1 VALUES ('v','v'),('s','v');
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+a	b
+s	v
+explain extended
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	alias	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; FirstMatch(alias); Using join buffer (flat, BNL join)
+Warnings:
+Note	1276	Field or reference 'test.alias.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.alias.b' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`alias`.`a` AS `a`,`test`.`alias`.`b` AS `b` from `test`.`t1` `alias` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`alias`.`b`) and (`test`.`alias`.`b` > `test`.`alias`.`a`))
+SET optimizer_switch = REPLACE( @@optimizer_switch, '=on', '=off' );
+SET optimizer_switch = 'exists_to_in=on,materialization=on,semijoin=off';
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+a	b
+s	v
+explain extended
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	alias	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+Warnings:
+Note	1276	Field or reference 'test.alias.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.alias.b' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`alias`.`a` AS `a`,`test`.`alias`.`b` AS `b` from `test`.`t1` `alias` where <in_optimizer>(`test`.`alias`.`b`,<exists>(select `test`.`t1`.`a` from `test`.`t1` where ((`test`.`t1`.`a` > `test`.`alias`.`a`) and (<cache>(`test`.`alias`.`b`) = `test`.`t1`.`a`))))
+SET optimizer_switch = 'exists_to_in=on,materialization=on,semijoin=on';
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+a	b
+s	v
+explain extended
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	alias	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Start temporary; End temporary
+Warnings:
+Note	1276	Field or reference 'test.alias.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.alias.b' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`alias`.`a` AS `a`,`test`.`alias`.`b` AS `b` from `test`.`t1` `alias` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`alias`.`b`) and (`test`.`alias`.`b` > `test`.`alias`.`a`))
+drop table t1;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+#
+# MDEV-403 Wrong result (missing rows) with subquery in
+# EXISTS and an OR condition outside
+#
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (2),(3);
+CREATE TABLE t2 (b INT);
+INSERT INTO t2 VALUES (1),(3);
+SET optimizer_switch = 'exists_to_in=off,in_to_exists=on';
+SELECT * FROM t1 AS alias1, t2 AS alias2 
+WHERE EXISTS ( 
+SELECT 1 FROM t2 WHERE b = alias1.a AND b > alias2.b 
+) OR a = 5;
+a	b
+3	1
+SET optimizer_switch = 'exists_to_in=on,in_to_exists=on';
+SELECT * FROM t1 AS alias1, t2 AS alias2 
+WHERE EXISTS ( 
+SELECT 1 FROM t2 WHERE b = alias1.a AND b > alias2.b 
+) OR a = 5;
+a	b
+3	1
+explain extended
+SELECT * FROM t1 AS alias1, t2 AS alias2 
+WHERE EXISTS ( 
+SELECT 1 FROM t2 WHERE b = alias1.a AND b > alias2.b 
+) OR a = 5;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	alias1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	alias2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer (flat, BNL join)
+2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+Warnings:
+Note	1276	Field or reference 'test.alias1.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.alias2.b' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`alias1`.`a` AS `a`,`test`.`alias2`.`b` AS `b` from `test`.`t1` `alias1` join `test`.`t2` `alias2` where (<expr_cache><`test`.`alias1`.`a`,`test`.`alias2`.`b`>(<in_optimizer>(`test`.`alias1`.`a`,<exists>(select `test`.`t2`.`b` from `test`.`t2` where ((`test`.`t2`.`b` > `test`.`alias2`.`b`) and (<cache>(`test`.`alias1`.`a`) = `test`.`t2`.`b`))))) or (`test`.`alias1`.`a` = 5))
+drop table t1, t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+#
+# MDEV-404: Wrong result (extra rows) with STRAIGHT_JOIN,
+# EXISTS subquery, NOT NULL column
+# (same as above)
+#
+SET optimizer_switch = 'exists_to_in=on,in_to_exists=on';
+CREATE TABLE t1 (a INT, b VARCHAR(1) NOT NULL);
+INSERT INTO t1 VALUES (1,'s'),(2,'e');
+SELECT STRAIGHT_JOIN * FROM t1 AS alias1, t1 AS alias2 
+WHERE EXISTS ( SELECT 1 FROM t1 WHERE b < alias2.b AND a = alias1.a );
+a	b	a	b
+2	e	1	s
+drop table t1;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+#
+# MDEV-3800: ORDER BY doesn't work with exists_to_in=ON on
+# a query with EXISTS subquery and OR condition
+#
+SET optimizer_switch = 'in_to_exists=on,exists_to_in=on';
+CREATE TABLE t1 (a INT, b VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (4,'j'),(6,'v'),(3,'c');
+CREATE TABLE t2 (c VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES ('b'),('y');
+SELECT a FROM t1
+WHERE EXISTS ( 
+SELECT 1 FROM t2 WHERE c = b 
+) OR b NOT IN ('U')  
+ORDER BY a;
+a
+3
+4
+6
+select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`b` in (select `test`.`t2`.`c` from `test`.`t2` where 1 ) or (`test`.`t1`.`b` <> 'U') order by `test`.`t1`.`a`;
+a
+3
+4
+6
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+#
+# correct calculation of reserved items (postreview-fix)
+#
+create table t1 (col1 int, col2 int, col3 int);
+insert into t1 values (1,2,3),(2,3,4),(4,5,6);
+create table t2 as select * from t1;
+explain extended
+select * from t1 where exists (select col2 from t2 where t2.col1=t1.col1 and t2.col2=t1.col2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	8	func,func	1	100.00	
+2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
+Warnings:
+Note	1276	Field or reference 'test.t1.col1' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.t1.col2' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t1`.`col1` AS `col1`,`test`.`t1`.`col2` AS `col2`,`test`.`t1`.`col3` AS `col3` from `test`.`t1` semi join (`test`.`t2`) where 1
+select * from t1 where exists (select col2 from t2 where t2.col1=t1.col1 and t2.col2=t1.col2);
+col1	col2	col3
+1	2	3
+2	3	4
+4	5	6
+drop table t1,t2;
+#
+# MDEV-3879: Exists2In: Wrong result (extra row) and unexpected
+# warning with exists_to_in=on and a NOT EXISTS subquery
+#
+SET optimizer_switch = 'exists_to_in=on';
+CREATE TABLE t1 (a1 INT, b1 CHAR(1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (3,'y'),(6,'w');
+CREATE TABLE t2 (a2 INT, b2 CHAR(1)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (3,'y'),(6,'d');
+SELECT * FROM t1
+WHERE NOT EXISTS ( SELECT * FROM t2 WHERE b2 = b1 AND a2 = a1 );
+a1	b1
+6	w
+drop table t1, t2;
+#
+# MDEV-3880: Wrong result (missing rows) with exists_to_in=on,
+# LEFT JOIN and NOT EXISTS subquery.
+# (Duplicate of above MDEV-3879).
+#
+SET optimizer_switch = 'exists_to_in=on';
+CREATE TABLE t1 (a1 INT, b1 CHAR(1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (4,'b'),(5,'y');
+CREATE TABLE t2 (b2 CHAR(1)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES ('z'),('b');
+CREATE TABLE t3 (a3 INT, b3 CHAR(1)) ENGINE=MyISAM;
+INSERT INTO t3 VALUES (4,'j'),(6,'v');
+SELECT * FROM t1 LEFT JOIN t2 ON ( b2 = b1 ) 
+WHERE NOT EXISTS ( SELECT * FROM t3 WHERE b3 = b2 AND a3 = a1 ) ;
+a1	b1	b2
+4	b	b
+5	y	NULL
+drop table t1, t2, t3;
+#
+# MDEV-3881: Endless loop and crash in Item_ref::real_item with
+# exists_to_in=on, NOT EXISTS subquery, merge view or from subquery,
+# constant table
+#
+SET optimizer_switch = 'exists_to_in=on';
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(7);
+CREATE TABLE t2 (b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (8);
+CREATE ALGORITHM=MERGE VIEW v1 AS SELECT * FROM t2;
+CREATE TABLE t3 (c INT) ENGINE=MyISAM;
+INSERT INTO t3 VALUES (4),(6);
+SELECT * FROM t1, v1 WHERE NOT EXISTS ( SELECT * FROM t3 WHERE c = b ) AND a = b;
+a	b
+drop view v1;
+drop table t1, t2, t3;
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(7);
+CREATE TABLE t2 (b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (8);
+CREATE TABLE t3 (c INT) ENGINE=MyISAM;
+INSERT INTO t3 VALUES (4),(6);
+SELECT * FROM t1, ( SELECT * FROM t2 ) alias WHERE NOT EXISTS ( SELECT * FROM t3 WHERE c = b ) AND a = b;
+a	b
+drop table t1, t2, t3;
+#
+# MDEV-3906: Server crashes in Dependency_marker::visit_field
+# on 2nd execution of PS with exists_to_in and NOT EXISTS subquery
+#
+SET optimizer_switch='exists_to_in=on';
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(7);
+PREPARE stmt FROM ' 
+SELECT * FROM t1 AS alias 
+WHERE NOT EXISTS ( SELECT * FROM t1 WHERE t1.a = alias.a ) 
+';
+EXECUTE stmt;
+a
+EXECUTE stmt;
+a
+drop table t1;
+#
+# MDEV-3904: Assertion `in_subs->has_strategy()' failed in
+# JOIN::choose_subquery_plan on 2nd execution of PS with
+# exists_to_in+semijoin, EXISTS subquery, MERGE view or FROM subquery
+#
+SET optimizer_switch='in_to_exists=on,semijoin=on,exists_to_in=on';
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(2);
+CREATE TABLE t2 (b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (4),(6);
+CREATE ALGORITHM=MERGE VIEW v AS 
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t2 WHERE b = a );
+PREPARE stmt FROM ' SELECT * FROM v ';
+EXECUTE stmt;
+a
+EXECUTE stmt;
+a
+drop view v;
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+#
+# MDEV-3903: Server crashes in Item_cond::fix_fields on 2nd execution
+# of a prepared stmt with exists_to_in+materialization+semijoin,
+# EXISTS subquery, STRAIGHT_JOIN
+#
+SET optimizer_switch='materialization=on,semijoin=on,exists_to_in=on';
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(2);
+CREATE TABLE t2 (b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (3),(4);
+PREPARE stmt FROM
+'SELECT STRAIGHT_JOIN * FROM t1
+WHERE EXISTS ( SELECT * FROM t2 WHERE b = a )';
+EXECUTE stmt;
+a
+EXECUTE stmt;
+a
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+#
+# MDEV-4152: Wrong result (missing rows) with exists_to_in=on, 
+# inner joins
+#
+SET optimizer_switch='materialization=on,semijoin=on,exists_to_in=on';
+CREATE TABLE t1 (i INT, c1 CHAR(5), c2 CHAR(5), t1_field VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1,'test1','test2','f'), (2,'test3','test4','d');
+CREATE TABLE t2 (t2_field VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES ('m'), ('b');
+CREATE TABLE t3 (t3_field VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t3 VALUES ('b'),('c');
+SELECT * FROM t1, t2 outer_t2 
+WHERE EXISTS ( SELECT 1 FROM t2, t3 WHERE t3_field = outer_t2.t2_field AND t2_field <= t1_field );
+i	c1	c2	t1_field	t2_field
+1	test1	test2	f	b
+2	test3	test4	d	b
+drop table t1,t2,t3;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+set optimizer_switch=default;
diff --git a/mysql-test/r/subselect_exists2in_costmat.result b/mysql-test/r/subselect_exists2in_costmat.result
new file mode 100644
index 00000000000..a46996d9bad
--- /dev/null
+++ b/mysql-test/r/subselect_exists2in_costmat.result
@@ -0,0 +1,103 @@
+set @subselect_mat_cost=@@optimizer_switch;
+set optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
+set long_query_time=0.1;
+drop database if exists world;
+set names utf8;
+create database world;
+use world;
+CREATE TABLE Country (
+Code char(3) NOT NULL default '',
+Name char(52) NOT NULL default '',
+SurfaceArea float(10,2) NOT NULL default '0.00',
+Population int(11) NOT NULL default '0',
+Capital int(11) default NULL,
+PRIMARY KEY  (Code),
+UNIQUE INDEX (Name)
+);
+CREATE TABLE City (
+ID int(11) NOT NULL auto_increment,
+Name char(35) NOT NULL default '',
+Country char(3) NOT NULL default '',
+Population int(11) NOT NULL default '0',
+PRIMARY KEY  (ID),
+INDEX (Population),
+INDEX (Country) 
+);
+CREATE TABLE CountryLanguage (
+Country char(3) NOT NULL default '',
+Language char(30) NOT NULL default '',
+Percentage float(3,1) NOT NULL default '0.0',
+PRIMARY KEY  (Country, Language),
+INDEX (Percentage)
+);
+Make the schema and data more diverse by adding more indexes, nullable
+columns, and NULL data.
+create index SurfaceArea on Country(SurfaceArea);
+create index Language on CountryLanguage(Language);
+create index CityName on City(Name);
+alter table City change population population int(11) null default 0;
+select max(id) from City into @max_city_id;
+insert into City values (@max_city_id + 1,'Kilifarevo','BGR',NULL);
+SELECT COUNT(*) FROM Country;
+COUNT(*)
+239
+SELECT COUNT(*) FROM City;
+COUNT(*)
+4080
+SELECT COUNT(*) FROM CountryLanguage;
+COUNT(*)
+984
+set @@optimizer_switch = 'exists_to_in=on,in_to_exists=on,semijoin=on,materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on';
+
+1. Subquery in a disjunctive WHERE clause of the outer query.
+
+
+Q1.1m:
+MATERIALIZATION: there are too many rows in the outer query
+to be looked up in the inner table.
+EXPLAIN
+SELECT Name FROM Country
+WHERE (EXISTS (select 1 from City where City.Population > 100000 and
+Code = Country) OR
+Name LIKE 'L%') AND
+surfacearea > 1000000;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	Country	ALL	Name,SurfaceArea	NULL	NULL	NULL	239	Using where
+2	MATERIALIZED	City	ALL	Population,Country	NULL	NULL	NULL	4080	Using where
+SELECT Name FROM Country
+WHERE (EXISTS (select 1 from City where City.Population > 100000 and
+Code = Country) OR
+Name LIKE 'L%') AND
+surfacearea > 1000000;
+Name
+Algeria
+Angola
+Argentina
+Australia
+Bolivia
+Brazil
+Egypt
+South Africa
+Ethiopia
+Indonesia
+India
+Iran
+Canada
+Kazakstan
+China
+Colombia
+Congo, The Democratic Republic of the
+Libyan Arab Jamahiriya
+Mali
+Mauritania
+Mexico
+Mongolia
+Niger
+Peru
+Saudi Arabia
+Sudan
+Chad
+Russian Federation
+United States
+drop database world;
+set optimizer_switch=@subselect_mat_cost;
diff --git a/mysql-test/r/subselect_exists_to_in.result b/mysql-test/r/subselect_exists_to_in.result
new file mode 100644
index 00000000000..b680e7623f5
--- /dev/null
+++ b/mysql-test/r/subselect_exists_to_in.result
@@ -0,0 +1,7021 @@
+select @@optimizer_switch like '%exists_to_in=on%';
+@@optimizer_switch like '%exists_to_in=on%'
+0
+set optimizer_switch='exists_to_in=on';
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t11,t12;
+drop view if exists v2;
+set @subselect_tmp=@@optimizer_switch;
+set @@optimizer_switch=ifnull(@optimizer_switch_for_subselect_test,
+"semijoin=on,firstmatch=on,loosescan=on,semijoin_with_cache=on,partial_match_rowid_merge=off,partial_match_table_scan=off");
+set join_cache_level=1;
+set optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
+select (select 2);
+(select 2)
+2
+explain extended select (select 2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+Warnings:
+Note	1249	Select 2 was reduced during optimization
+Note	1003	select 2 AS `(select 2)`
+SELECT (SELECT 1) UNION SELECT (SELECT 2);
+(SELECT 1)
+1
+2
+explain extended SELECT (SELECT 1) UNION SELECT (SELECT 2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+3	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+NULL	UNION RESULT	<union1,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
+Warnings:
+Note	1249	Select 2 was reduced during optimization
+Note	1249	Select 4 was reduced during optimization
+Note	1003	select 1 AS `(SELECT 1)` union select 2 AS `(SELECT 2)`
+SELECT (SELECT (SELECT 0 UNION SELECT 0));
+(SELECT (SELECT 0 UNION SELECT 0))
+0
+explain extended SELECT (SELECT (SELECT 0 UNION SELECT 0));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+3	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+4	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
+Warnings:
+Note	1249	Select 2 was reduced during optimization
+Note	1003	select (select 0 union select 0) AS `(SELECT (SELECT 0 UNION SELECT 0))`
+SELECT (SELECT 1 FROM (SELECT 1) as b HAVING a=1) as a;
+ERROR 42S22: Reference 'a' not supported (forward reference in item list)
+SELECT (SELECT 1 FROM (SELECT 1) as b HAVING b=1) as a,(SELECT 1 FROM (SELECT 1) as c HAVING a=1) as b;
+ERROR 42S22: Reference 'b' not supported (forward reference in item list)
+SELECT (SELECT 1),MAX(1) FROM (SELECT 1) as a;
+(SELECT 1)	MAX(1)
+1	1
+SELECT (SELECT a) as a;
+ERROR 42S22: Reference 'a' not supported (forward reference in item list)
+EXPLAIN EXTENDED SELECT 1 FROM (SELECT 1 as a) as b  HAVING (SELECT a)=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	100.00	
+3	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+Warnings:
+Note	1276	Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
+Note	1276	Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
+Note	1003	select 1 AS `1` from dual having ((select 1) = 1)
+SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
+1
+1
+SELECT (SELECT 1), a;
+ERROR 42S22: Unknown column 'a' in 'field list'
+SELECT 1 as a FROM (SELECT 1) as b HAVING (SELECT a)=1;
+a
+1
+SELECT 1 FROM (SELECT (SELECT a) b) c;
+ERROR 42S22: Unknown column 'a' in 'field list'
+SELECT * FROM (SELECT 1 as id) b WHERE id IN (SELECT * FROM (SELECT 1 as id) c ORDER BY id);
+id
+1
+SELECT * FROM (SELECT 1) a  WHERE 1 IN (SELECT 1,1);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT 1 IN (SELECT 1);
+1 IN (SELECT 1)
+1
+SELECT 1 FROM (SELECT 1 as a) b WHERE 1 IN (SELECT (SELECT a));
+1
+1
+select (SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE(1));
+ERROR HY000: Incorrect usage of PROCEDURE and subquery
+SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE((SELECT 1));
+ERROR HY000: Incorrect parameters to procedure 'ANALYSE'
+SELECT (SELECT 1) as a FROM (SELECT 1) b WHERE (SELECT a) IS NULL;
+ERROR 42S22: Unknown column 'a' in 'field list'
+SELECT (SELECT 1) as a FROM (SELECT 1) b WHERE (SELECT a) IS NOT NULL;
+ERROR 42S22: Unknown column 'a' in 'field list'
+SELECT (SELECT 1,2,3) = ROW(1,2,3);
+(SELECT 1,2,3) = ROW(1,2,3)
+1
+SELECT (SELECT 1,2,3) = ROW(1,2,1);
+(SELECT 1,2,3) = ROW(1,2,1)
+0
+SELECT (SELECT 1,2,3) < ROW(1,2,1);
+(SELECT 1,2,3) < ROW(1,2,1)
+0
+SELECT (SELECT 1,2,3) > ROW(1,2,1);
+(SELECT 1,2,3) > ROW(1,2,1)
+1
+SELECT (SELECT 1,2,3) = ROW(1,2,NULL);
+(SELECT 1,2,3) = ROW(1,2,NULL)
+NULL
+SELECT ROW(1,2,3) = (SELECT 1,2,3);
+ROW(1,2,3) = (SELECT 1,2,3)
+1
+SELECT ROW(1,2,3) = (SELECT 1,2,1);
+ROW(1,2,3) = (SELECT 1,2,1)
+0
+SELECT ROW(1,2,3) < (SELECT 1,2,1);
+ROW(1,2,3) < (SELECT 1,2,1)
+0
+SELECT ROW(1,2,3) > (SELECT 1,2,1);
+ROW(1,2,3) > (SELECT 1,2,1)
+1
+SELECT ROW(1,2,3) = (SELECT 1,2,NULL);
+ROW(1,2,3) = (SELECT 1,2,NULL)
+NULL
+SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'a');
+(SELECT 1.5,2,'a') = ROW(1.5,2,'a')
+1
+SELECT (SELECT 1.5,2,'a') = ROW(1.5,2,'b');
+(SELECT 1.5,2,'a') = ROW(1.5,2,'b')
+0
+SELECT (SELECT 1.5,2,'a') = ROW('1.5b',2,'b');
+(SELECT 1.5,2,'a') = ROW('1.5b',2,'b')
+0
+Warnings:
+Warning	1292	Truncated incorrect DOUBLE value: '1.5b'
+SELECT (SELECT 'b',2,'a') = ROW(1.5,2,'a');
+(SELECT 'b',2,'a') = ROW(1.5,2,'a')
+0
+SELECT (SELECT 1.5,2,'a') = ROW(1.5,'2','a');
+(SELECT 1.5,2,'a') = ROW(1.5,'2','a')
+1
+SELECT (SELECT 1.5,'c','a') = ROW(1.5,2,'a');
+(SELECT 1.5,'c','a') = ROW(1.5,2,'a')
+0
+SELECT (SELECT * FROM (SELECT 'test' a,'test' b) a);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT 1 as a,(SELECT a+a) b,(SELECT b);
+a	b	(SELECT b)
+1	2	2
+create table t1 (a int);
+create table t2 (a int, b int);
+create table t3 (a int);
+create table t4 (a int not null, b int not null);
+insert into t1 values (2);
+insert into t2 values (1,7),(2,7);
+insert into t4 values (4,8),(3,8),(5,9);
+select (select a from t1 where t1.a = a1) as a2, (select b from t2 where t2.b=a2) as a1;
+ERROR 42S22: Reference 'a1' not supported (forward reference in item list)
+select (select a from t1 where t1.a=t2.a), a from t2;
+(select a from t1 where t1.a=t2.a)	a
+NULL	1
+2	2
+select (select a from t1 where t1.a=t2.b), a from t2;
+(select a from t1 where t1.a=t2.b)	a
+NULL	1
+NULL	2
+select (select a from t1), a, (select 1 union select 2 limit 1) from t2;
+(select a from t1)	a	(select 1 union select 2 limit 1)
+2	1	1
+2	2	1
+select (select a from t3), a from t2;
+(select a from t3)	a
+NULL	1
+NULL	2
+select * from t2 where t2.a=(select a from t1);
+a	b
+2	7
+insert into t3 values (6),(7),(3);
+select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1);
+a	b
+1	7
+2	7
+(select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)) union (select * from t4 order by a limit 2) limit 3;
+a	b
+1	7
+2	7
+3	8
+(select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)) union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
+a	b
+1	7
+2	7
+4	8
+3	8
+explain extended (select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)) union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using filesort
+3	UNION	t4	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+4	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
+NULL	UNION RESULT	<union1,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
+Warnings:
+Note	1003	(select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` where (`test`.`t2`.`b` = (select `test`.`t3`.`a` from `test`.`t3` order by 1 desc limit 1))) union (select `test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t4` where (`test`.`t4`.`b` = (select (max(`test`.`t2`.`a`) * 4) from `test`.`t2`)) order by `a`)
+select (select a from t3 where a<t2.a*4 order by 1 desc limit 1), a from t2;
+(select a from t3 where a<t2.a*4 order by 1 desc limit 1)	a
+3	1
+7	2
+select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
+(select * from t2 where a>1) as tt;
+(select t3.a from t3 where a<8 order by 1 desc limit 1)	a
+7	2
+set @tmp_optimizer_switch=@@optimizer_switch;
+set optimizer_switch='derived_merge=off,derived_with_keys=off';
+explain extended select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
+(select * from t2 where a>1) as tt;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	100.00	
+3	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using filesort
+Warnings:
+Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,`tt`.`a` AS `a` from (select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` where (`test`.`t2`.`a` > 1)) `tt`
+set optimizer_switch=@tmp_optimizer_switch;
+select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
+a
+2
+select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3 where t3.a > t1.a) order by 1 desc limit 1);
+a
+2
+select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3 where t3.a < t1.a) order by 1 desc limit 1);
+a
+select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4;
+b	(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2)
+8	7.5000
+8	4.5000
+9	7.5000
+explain extended select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t4	ALL	NULL	NULL	NULL	NULL	3	100.00	
+2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
+3	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+Warnings:
+Note	1276	Field or reference 'test.t4.a' of SELECT #3 was resolved in SELECT #1
+Note	1003	select `test`.`t4`.`b` AS `b`,<expr_cache><`test`.`t4`.`a`>((select avg((`test`.`t2`.`a` + (select min(`test`.`t3`.`a`) from `test`.`t3` where (`test`.`t3`.`a` >= `test`.`t4`.`a`)))) from `test`.`t2`)) AS `(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2)` from `test`.`t4`
+select * from t3 where exists (select * from t2 where t2.b=t3.a);
+a
+7
+select * from t3 where not exists (select * from t2 where t2.b=t3.a);
+a
+6
+3
+select * from t3 where a in (select b from t2);
+a
+7
+select * from t3 where a not in (select b from t2);
+a
+6
+3
+select * from t3 where a = some (select b from t2);
+a
+7
+select * from t3 where a <> any (select b from t2);
+a
+6
+3
+select * from t3 where a = all (select b from t2);
+a
+7
+select * from t3 where a <> all (select b from t2);
+a
+6
+3
+insert into t2 values (100, 5);
+select * from t3 where a < any (select b from t2);
+a
+6
+3
+select * from t3 where a < all (select b from t2);
+a
+3
+select * from t3 where a >= any (select b from t2);
+a
+6
+7
+explain extended select * from t3 where a >= any (select b from t2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	
+Warnings:
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(`test`.`t3`.`a`,((select min(`test`.`t2`.`b`) from `test`.`t2`) <= <cache>(`test`.`t3`.`a`))))
+select * from t3 where a >= all (select b from t2);
+a
+7
+delete from t2 where a=100;
+select * from t3 where a in (select a,b from t2);
+ERROR 21000: Operand should contain 1 column(s)
+select * from t3 where a in (select * from t2);
+ERROR 21000: Operand should contain 1 column(s)
+insert into t4 values (12,7),(1,7),(10,9),(9,6),(7,6),(3,9),(1,10);
+select b,max(a) as ma from t4 group by b having b < (select max(t2.a) from t2 where t2.b=t4.b);
+b	ma
+insert into t2 values (2,10);
+select b,max(a) as ma from t4 group by b having ma < (select max(t2.a) from t2 where t2.b=t4.b);
+b	ma
+10	1
+delete from t2 where a=2 and b=10;
+select b,max(a) as ma from t4 group by b having b >= (select max(t2.a) from t2 where t2.b=t4.b);
+b	ma
+7	12
+create table t5 (a int);
+select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
+(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a)	a
+NULL	1
+2	2
+insert into t5 values (5);
+select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
+(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a)	a
+NULL	1
+2	2
+insert into t5 values (2);
+select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
+(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a)	a
+NULL	1
+2	2
+explain extended select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
+2	DEPENDENT SUBQUERY	t1	system	NULL	NULL	NULL	NULL	1	100.00	
+3	DEPENDENT UNION	t5	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
+Warnings:
+Note	1276	Field or reference 'test.t2.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.t2.a' of SELECT #3 was resolved in SELECT #1
+Note	1003	select <expr_cache><`test`.`t2`.`a`>((select 2 from dual where (2 = `test`.`t2`.`a`) union select `test`.`t5`.`a` from `test`.`t5` where (`test`.`t5`.`a` = `test`.`t2`.`a`))) AS `(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a)`,`test`.`t2`.`a` AS `a` from `test`.`t2`
+select (select a from t1 where t1.a=t2.a union all select a from t5 where t5.a=t2.a), a from t2;
+ERROR 21000: Subquery returns more than 1 row
+create table t6 (patient_uq int, clinic_uq int, index i1 (clinic_uq));
+create table t7( uq int primary key, name char(25));
+insert into t7 values(1,"Oblastnaia bolnitsa"),(2,"Bolnitsa Krasnogo Kresta");
+insert into t6 values (1,1),(1,2),(2,2),(1,3);
+select * from t6 where exists (select * from t7 where uq = clinic_uq);
+patient_uq	clinic_uq
+1	1
+1	2
+2	2
+explain extended select * from t6 where exists (select * from t7 where uq = clinic_uq);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t7	index	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index
+1	PRIMARY	t6	ALL	i1	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1276	Field or reference 'test.t6.clinic_uq' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`t6`.`patient_uq` AS `patient_uq`,`test`.`t6`.`clinic_uq` AS `clinic_uq` from `test`.`t7` join `test`.`t6` where (`test`.`t6`.`clinic_uq` = `test`.`t7`.`uq`)
+select * from t1 where a= (select a from t2,t4 where t2.b=t4.b);
+ERROR 23000: Column 'a' in field list is ambiguous
+drop table t1,t2,t3;
+CREATE TABLE t3 (a varchar(20),b char(1) NOT NULL default '0');
+INSERT INTO t3 VALUES ('W','a'),('A','c'),('J','b');
+CREATE TABLE t2 (a varchar(20),b int NOT NULL default '0');
+INSERT INTO t2 VALUES ('W','1'),('A','3'),('J','2');
+CREATE TABLE t1 (a varchar(20),b date NOT NULL default '0000-00-00');
+INSERT INTO t1 VALUES ('W','1732-02-22'),('A','1735-10-30'),('J','1743-04-13');
+SELECT * FROM t1 WHERE b = (SELECT MIN(b) FROM t1);
+a	b
+W	1732-02-22
+SELECT * FROM t2 WHERE b = (SELECT MIN(b) FROM t2);
+a	b
+W	1
+SELECT * FROM t3 WHERE b = (SELECT MIN(b) FROM t3);
+a	b
+W	a
+CREATE TABLE `t8` (
+`pseudo` varchar(35) character set latin1 NOT NULL default '',
+`email` varchar(60) character set latin1 NOT NULL default '',
+PRIMARY KEY  (`pseudo`),
+UNIQUE KEY `email` (`email`)
+) ENGINE=MyISAM CHARSET=latin1 ROW_FORMAT=DYNAMIC;
+INSERT INTO t8 (pseudo,email) VALUES ('joce','test');
+INSERT INTO t8 (pseudo,email) VALUES ('joce1','test1');
+INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
+EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
+4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
+2	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	
+3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
+Warnings:
+Note	1003	select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where 1) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where 1
+SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
+t8 WHERE pseudo='joce');
+ERROR 21000: Operand should contain 1 column(s)
+SELECT pseudo FROM t8 WHERE pseudo=(SELECT * FROM t8 WHERE
+pseudo='joce');
+ERROR 21000: Operand should contain 1 column(s)
+SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
+pseudo
+joce
+SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo LIKE '%joce%');
+ERROR 21000: Subquery returns more than 1 row
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8;
+CREATE TABLE `t1` (
+`topic` mediumint(8) unsigned NOT NULL default '0',
+`date` date NOT NULL default '0000-00-00',
+`pseudo` varchar(35) character set latin1 NOT NULL default '',
+PRIMARY KEY  (`pseudo`,`date`,`topic`),
+KEY `topic` (`topic`)
+) ENGINE=MyISAM ROW_FORMAT=DYNAMIC;
+INSERT INTO t1 (topic,date,pseudo) VALUES
+('43506','2002-10-02','joce'),('40143','2002-08-03','joce');
+EXPLAIN EXTENDED SELECT DISTINCT date FROM t1 WHERE date='2002-08-03';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	index	NULL	PRIMARY	43	NULL	2	100.00	Using where; Using index
+Warnings:
+Note	1003	select distinct `test`.`t1`.`date` AS `date` from `test`.`t1` where (`test`.`t1`.`date` = '2002-08-03')
+EXPLAIN EXTENDED SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03');
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+2	SUBQUERY	t1	index	NULL	PRIMARY	43	NULL	2	100.00	Using where; Using index
+Warnings:
+Note	1003	select (select distinct `test`.`t1`.`date` from `test`.`t1` where (`test`.`t1`.`date` = '2002-08-03')) AS `(SELECT DISTINCT date FROM t1 WHERE date='2002-08-03')`
+SELECT DISTINCT date FROM t1 WHERE date='2002-08-03';
+date
+2002-08-03
+SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03');
+(SELECT DISTINCT date FROM t1 WHERE date='2002-08-03')
+2002-08-03
+SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION SELECT 1) UNION ALL SELECT 1;
+1
+1
+1
+1
+SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION ALL SELECT 1) UNION SELECT 1;
+ERROR 21000: Subquery returns more than 1 row
+EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION SELECT 1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	topic	3	NULL	2	100.00	Using index
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+3	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
+Warnings:
+Note	1003	select 1 AS `1` from `test`.`t1` where (1 = (select 1 union select 1))
+drop table t1;
+CREATE TABLE `t1` (
+`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
+`maxnumrep` int(10) unsigned NOT NULL default '0',
+PRIMARY KEY  (`numeropost`),
+UNIQUE KEY `maxnumrep` (`maxnumrep`)
+) ENGINE=MyISAM ROW_FORMAT=FIXED;
+INSERT INTO t1 (numeropost,maxnumrep) VALUES (40143,1),(43506,2);
+CREATE TABLE `t2` (
+`mot` varchar(30) NOT NULL default '',
+`topic` mediumint(8) unsigned NOT NULL default '0',
+`date` date NOT NULL default '0000-00-00',
+`pseudo` varchar(35) NOT NULL default '',
+PRIMARY KEY  (`mot`,`pseudo`,`date`,`topic`)
+) ENGINE=MyISAM ROW_FORMAT=DYNAMIC;
+INSERT INTO t2 (mot,topic,date,pseudo) VALUES ('joce','40143','2002-10-22','joce'), ('joce','43506','2002-10-22','joce');
+select numeropost as a FROM t1 GROUP BY (SELECT 1 FROM t1 HAVING a=1);
+a
+40143
+SELECT numeropost,maxnumrep FROM t1 WHERE exists (SELECT 1 FROM t2 WHERE (mot='joce') AND date >= '2002-10-21' AND t1.numeropost = t2.topic) ORDER BY maxnumrep DESC LIMIT 0, 20;
+numeropost	maxnumrep
+43506	2
+40143	1
+SELECT (SELECT 1) as a FROM (SELECT 1 FROM t1 HAVING a=1) b;
+ERROR 42S22: Unknown column 'a' in 'having clause'
+SELECT 1 IN (SELECT 1 FROM t2 HAVING a);
+ERROR 42S22: Unknown column 'a' in 'having clause'
+SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY topic);
+mot	topic	date	pseudo
+joce	40143	2002-10-22	joce
+joce	43506	2002-10-22	joce
+SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100);
+mot	topic	date	pseudo
+SELECT * from t2 where topic IN (SELECT SUM(topic) FROM t1);
+mot	topic	date	pseudo
+SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic);
+mot	topic	date	pseudo
+joce	40143	2002-10-22	joce
+joce	43506	2002-10-22	joce
+SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100);
+mot	topic	date	pseudo
+SELECT * from t2 where topic = any (SELECT SUM(topic) FROM t1);
+mot	topic	date	pseudo
+SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic);
+mot	topic	date	pseudo
+SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100);
+mot	topic	date	pseudo
+joce	40143	2002-10-22	joce
+joce	43506	2002-10-22	joce
+SELECT *, topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100) from t2;
+mot	topic	date	pseudo	topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 4100)
+joce	40143	2002-10-22	joce	1
+joce	43506	2002-10-22	joce	1
+SELECT * from t2 where topic = all (SELECT SUM(topic) FROM t2);
+mot	topic	date	pseudo
+SELECT * from t2 where topic <> any (SELECT SUM(topic) FROM t2);
+mot	topic	date	pseudo
+joce	40143	2002-10-22	joce
+joce	43506	2002-10-22	joce
+SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000);
+mot	topic	date	pseudo
+joce	40143	2002-10-22	joce
+SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000);
+mot	topic	date	pseudo
+joce	40143	2002-10-22	joce
+SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000);
+mot	topic	date	pseudo
+joce	40143	2002-10-22	joce
+SELECT *, topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000) from t2;
+mot	topic	date	pseudo	topic = all (SELECT topic FROM t2 GROUP BY topic HAVING topic < 41000)
+joce	40143	2002-10-22	joce	1
+joce	43506	2002-10-22	joce	0
+drop table t1,t2;
+CREATE TABLE `t1` (
+`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
+`maxnumrep` int(10) unsigned NOT NULL default '0',
+PRIMARY KEY  (`numeropost`),
+UNIQUE KEY `maxnumrep` (`maxnumrep`)
+) ENGINE=MyISAM ROW_FORMAT=FIXED;
+INSERT INTO t1 (numeropost,maxnumrep) VALUES (1,0),(2,1);
+select numeropost as a FROM t1 GROUP BY (SELECT 1 FROM t1 HAVING a=1);
+ERROR 21000: Subquery returns more than 1 row
+select numeropost as a FROM t1 ORDER BY (SELECT 1 FROM t1 HAVING a=1);
+ERROR 21000: Subquery returns more than 1 row
+show warnings;
+Level	Code	Message
+Error	1242	Subquery returns more than 1 row
+Error	1028	Sort aborted: Subquery returns more than 1 row
+drop table t1;
+create table t1 (a int);
+insert into t1 values (1),(2),(3);
+(select * from t1) union (select * from t1) order by (select a from t1 limit 1);
+a
+1
+2
+3
+drop table t1;
+CREATE TABLE t1 (field char(1) NOT NULL DEFAULT 'b');
+INSERT INTO t1 VALUES ();
+SELECT field FROM t1 WHERE 1=(SELECT 1 UNION ALL SELECT 1 FROM (SELECT 1) a HAVING field='b');
+ERROR 21000: Subquery returns more than 1 row
+drop table t1;
+CREATE TABLE `t1` (
+`numeropost` mediumint(8) unsigned NOT NULL default '0',
+`numreponse` int(10) unsigned NOT NULL auto_increment,
+`pseudo` varchar(35) NOT NULL default '',
+PRIMARY KEY  (`numeropost`,`numreponse`),
+UNIQUE KEY `numreponse` (`numreponse`),
+KEY `pseudo` (`pseudo`,`numeropost`)
+) ENGINE=MyISAM;
+SELECT (SELECT numeropost FROM t1 HAVING numreponse=a),numreponse FROM (SELECT * FROM t1) as a;
+ERROR 42S22: Reference 'numreponse' not supported (forward reference in item list)
+SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=a) FROM (SELECT * FROM t1) as a;
+ERROR 42S22: Unknown column 'a' in 'having clause'
+SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=1) FROM (SELECT * FROM t1) as a;
+numreponse	(SELECT numeropost FROM t1 HAVING numreponse=1)
+INSERT INTO t1 (numeropost,numreponse,pseudo) VALUES (1,1,'joce'),(1,2,'joce'),(1,3,'test');
+EXPLAIN EXTENDED SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
+ERROR 21000: Subquery returns more than 1 row
+SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1');
+ERROR 21000: Subquery returns more than 1 row
+EXPLAIN EXTENDED SELECT MAX(numreponse) FROM t1 WHERE numeropost='1';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+Warnings:
+Note	1003	select max(`test`.`t1`.`numreponse`) AS `MAX(numreponse)` from `test`.`t1` where (`test`.`t1`.`numeropost` = '1')
+EXPLAIN EXTENDED SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT MAX(numreponse) FROM t1 WHERE numeropost='1');
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	const	PRIMARY,numreponse	PRIMARY	7	const,const	1	100.00	Using where; Using index
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+Warnings:
+Note	1003	select `test`.`t1`.`numreponse` AS `numreponse` from `test`.`t1` where ((`test`.`t1`.`numeropost` = '1') and (`test`.`t1`.`numreponse` = (select max(`test`.`t1`.`numreponse`) from `test`.`t1` where (`test`.`t1`.`numeropost` = '1'))))
+drop table t1;
+CREATE TABLE t1 (a int(1));
+INSERT INTO t1 VALUES (1);
+SELECT 1 FROM (SELECT a FROM t1) b HAVING (SELECT b.a)=1;
+1
+1
+drop table t1;
+create table t1 (a int NOT NULL, b int, primary key (a));
+create table t2 (a int NOT NULL, b int, primary key (a));
+insert into t1 values (0, 10),(1, 11),(2, 12);
+insert into t2 values (1, 21),(2, 22),(3, 23);
+select * from t1;
+a	b
+0	10
+1	11
+2	12
+update t1 set b= (select b from t1);
+ERROR HY000: You can't specify target table 't1' for update in FROM clause
+update t1 set b= (select b from t2);
+ERROR 21000: Subquery returns more than 1 row
+update t1 set b= (select b from t2 where t1.a = t2.a);
+select * from t1;
+a	b
+0	NULL
+1	21
+2	22
+drop table t1, t2;
+create table t1 (a int NOT NULL, b int, primary key (a));
+create table t2 (a int NOT NULL, b int, primary key (a));
+insert into t1 values (0, 10),(1, 11),(2, 12);
+insert into t2 values (1, 21),(2, 12),(3, 23);
+select * from t1;
+a	b
+0	10
+1	11
+2	12
+select * from t1 where b = (select b from t2 where t1.a = t2.a);
+a	b
+2	12
+delete from t1 where b in (select b from t1);
+ERROR HY000: You can't specify target table 't1' for update in FROM clause
+delete from t1 where b = (select b from t2);
+ERROR 21000: Subquery returns more than 1 row
+delete from t1 where b = (select b from t2 where t1.a = t2.a);
+select * from t1;
+a	b
+0	10
+1	11
+drop table t1, t2;
+create table t11 (a int NOT NULL, b int, primary key (a));
+create table t12 (a int NOT NULL, b int, primary key (a));
+create table t2 (a int NOT NULL, b int, primary key (a));
+insert into t11 values (0, 10),(1, 11),(2, 12);
+insert into t12 values (33, 10),(22, 11),(2, 12);
+insert into t2 values (1, 21),(2, 12),(3, 23);
+select * from t11;
+a	b
+0	10
+1	11
+2	12
+select * from t12;
+a	b
+33	10
+22	11
+2	12
+delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b = (select b from t12 where t11.a = t12.a);
+ERROR HY000: You can't specify target table 't12' for update in FROM clause
+delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b = (select b from t2);
+ERROR 21000: Subquery returns more than 1 row
+delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b = (select b from t2 where t11.a = t2.a);
+select * from t11;
+a	b
+0	10
+1	11
+select * from t12;
+a	b
+33	10
+22	11
+drop table t11, t12, t2;
+CREATE TABLE t1 (x int) ENGINE=MyISAM;
+create table t2 (a int) ENGINE=MyISAM;
+create table t3 (b int);
+insert into t2 values (1);
+insert into t3 values (1),(2);
+INSERT INTO t1 (x) VALUES ((SELECT x FROM t1));
+ERROR HY000: You can't specify target table 't1' for update in FROM clause
+INSERT INTO t1 (x) VALUES ((SELECT b FROM t3));
+ERROR 21000: Subquery returns more than 1 row
+INSERT INTO t1 (x) VALUES ((SELECT a FROM t2));
+select * from t1;
+x
+1
+insert into t2 values (1);
+INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(a) FROM t2));
+select * from t1;
+x
+1
+2
+INSERT INTO t1 (x) select (SELECT SUM(a)+1 FROM t2) FROM t2;
+select * from t1;
+x
+1
+2
+3
+3
+INSERT INTO t1 (x) select (SELECT SUM(x)+2 FROM t1) FROM t2;
+select * from t1;
+x
+1
+2
+3
+3
+11
+11
+INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(x) FROM t2));
+ERROR 42S22: Unknown column 'x' in 'field list'
+INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(a) FROM t2));
+select * from t1;
+x
+1
+2
+3
+3
+11
+11
+2
+drop table t1, t2, t3;
+CREATE TABLE t1 (x int not null, y int, primary key (x)) ENGINE=MyISAM;
+create table t2 (a int);
+create table t3 (a int);
+insert into t2 values (1);
+insert into t3 values (1),(2);
+select * from t1;
+x	y
+replace into t1 (x, y) VALUES ((SELECT x FROM t1), (SELECT a+1 FROM t2));
+ERROR HY000: You can't specify target table 't1' for update in FROM clause
+replace into t1 (x, y) VALUES ((SELECT a FROM t3), (SELECT a+1 FROM t2));
+ERROR 21000: Subquery returns more than 1 row
+replace into t1 (x, y) VALUES ((SELECT a FROM t2), (SELECT a+1 FROM t2));
+select * from t1;
+x	y
+1	2
+replace into t1 (x, y) VALUES ((SELECT a FROM t2), (SELECT a+2 FROM t2));
+select * from t1;
+x	y
+1	3
+replace DELAYED into t1 (x, y) VALUES ((SELECT a+3 FROM t2), (SELECT a FROM t2));
+select * from t1;
+x	y
+1	3
+4	1
+replace DELAYED into t1 (x, y) VALUES ((SELECT a+3 FROM t2), (SELECT a+1 FROM t2));
+select * from t1;
+x	y
+1	3
+4	2
+replace LOW_PRIORITY into t1 (x, y) VALUES ((SELECT a+1 FROM t2), (SELECT a FROM t2));
+select * from t1;
+x	y
+1	3
+4	2
+2	1
+drop table t1, t2, t3;
+SELECT * FROM (SELECT 1) b WHERE 1 IN (SELECT *);
+ERROR HY000: No tables used
+CREATE TABLE t2 (id int(11) default NULL, KEY id (id)) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t2 VALUES (1),(2);
+SELECT * FROM t2 WHERE id IN (SELECT 1);
+id
+1
+EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using index
+Warnings:
+Note	1249	Select 2 was reduced during optimization
+Note	1003	select `test`.`t2`.`id` AS `id` from `test`.`t2` where (`test`.`t2`.`id` = 1)
+SELECT * FROM t2 WHERE id IN (SELECT 1 UNION SELECT 3);
+id
+1
+SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
+id
+2
+EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	ref	id	id	5	const	1	100.00	Using where; Using index
+Warnings:
+Note	1249	Select 3 was reduced during optimization
+Note	1249	Select 2 was reduced during optimization
+Note	1003	select `test`.`t2`.`id` AS `id` from `test`.`t2` where (`test`.`t2`.`id` = <cache>((1 + 1)))
+EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1 UNION SELECT 3);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	index	NULL	id	5	NULL	2	100.00	Using where; Using index
+2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+3	DEPENDENT UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
+Warnings:
+Note	1003	select `test`.`t2`.`id` AS `id` from `test`.`t2` where <expr_cache><`test`.`t2`.`id`>(<in_optimizer>(`test`.`t2`.`id`,<exists>(select 1 having (<cache>(`test`.`t2`.`id`) = <ref_null_helper>(1)) union select 3 having (<cache>(`test`.`t2`.`id`) = <ref_null_helper>(3)))))
+SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 3);
+id
+SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 2);
+id
+2
+INSERT INTO t2 VALUES ((SELECT * FROM t2));
+ERROR HY000: You can't specify target table 't2' for update in FROM clause
+INSERT INTO t2 VALUES ((SELECT id FROM t2));
+ERROR HY000: You can't specify target table 't2' for update in FROM clause
+SELECT * FROM t2;
+id
+1
+2
+CREATE TABLE t1 (id int(11) default NULL, KEY id (id)) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t1 values (1),(1);
+UPDATE t2 SET id=(SELECT * FROM t1);
+ERROR 21000: Subquery returns more than 1 row
+drop table t2, t1;
+create table t1 (a int);
+insert into t1 values (1),(2),(3);
+select 1 IN (SELECT * from t1);
+1 IN (SELECT * from t1)
+1
+select 10 IN (SELECT * from t1);
+10 IN (SELECT * from t1)
+0
+select NULL IN (SELECT * from t1);
+NULL IN (SELECT * from t1)
+NULL
+update t1 set a=NULL where a=2;
+select 1 IN (SELECT * from t1);
+1 IN (SELECT * from t1)
+1
+select 3 IN (SELECT * from t1);
+3 IN (SELECT * from t1)
+1
+select 10 IN (SELECT * from t1);
+10 IN (SELECT * from t1)
+NULL
+select 1 > ALL (SELECT * from t1);
+1 > ALL (SELECT * from t1)
+0
+select 10 > ALL (SELECT * from t1);
+10 > ALL (SELECT * from t1)
+NULL
+select 1 > ANY (SELECT * from t1);
+1 > ANY (SELECT * from t1)
+NULL
+select 10 > ANY (SELECT * from t1);
+10 > ANY (SELECT * from t1)
+1
+drop table t1;
+create table t1 (a varchar(20));
+insert into t1 values ('A'),('BC'),('DEF');
+select 'A' IN (SELECT * from t1);
+'A' IN (SELECT * from t1)
+1
+select 'XYZS' IN (SELECT * from t1);
+'XYZS' IN (SELECT * from t1)
+0
+select NULL IN (SELECT * from t1);
+NULL IN (SELECT * from t1)
+NULL
+update t1 set a=NULL where a='BC';
+select 'A' IN (SELECT * from t1);
+'A' IN (SELECT * from t1)
+1
+select 'DEF' IN (SELECT * from t1);
+'DEF' IN (SELECT * from t1)
+1
+select 'XYZS' IN (SELECT * from t1);
+'XYZS' IN (SELECT * from t1)
+NULL
+select 'A' > ALL (SELECT * from t1);
+'A' > ALL (SELECT * from t1)
+0
+select 'XYZS' > ALL (SELECT * from t1);
+'XYZS' > ALL (SELECT * from t1)
+NULL
+select 'A' > ANY (SELECT * from t1);
+'A' > ANY (SELECT * from t1)
+NULL
+select 'XYZS' > ANY (SELECT * from t1);
+'XYZS' > ANY (SELECT * from t1)
+1
+drop table t1;
+create table t1 (a float);
+insert into t1 values (1.5),(2.5),(3.5);
+select 1.5 IN (SELECT * from t1);
+1.5 IN (SELECT * from t1)
+1
+select 10.5 IN (SELECT * from t1);
+10.5 IN (SELECT * from t1)
+0
+select NULL IN (SELECT * from t1);
+NULL IN (SELECT * from t1)
+NULL
+update t1 set a=NULL where a=2.5;
+select 1.5 IN (SELECT * from t1);
+1.5 IN (SELECT * from t1)
+1
+select 3.5 IN (SELECT * from t1);
+3.5 IN (SELECT * from t1)
+1
+select 10.5 IN (SELECT * from t1);
+10.5 IN (SELECT * from t1)
+NULL
+select 1.5 > ALL (SELECT * from t1);
+1.5 > ALL (SELECT * from t1)
+0
+select 10.5 > ALL (SELECT * from t1);
+10.5 > ALL (SELECT * from t1)
+NULL
+select 1.5 > ANY (SELECT * from t1);
+1.5 > ANY (SELECT * from t1)
+NULL
+select 10.5 > ANY (SELECT * from t1);
+10.5 > ANY (SELECT * from t1)
+1
+explain extended select (select a+1) from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1249	Select 2 was reduced during optimization
+Note	1003	select (`test`.`t1`.`a` + 1) AS `(select a+1)` from `test`.`t1`
+select (select a+1) from t1;
+(select a+1)
+2.5
+NULL
+4.5
+drop table t1;
+CREATE TABLE t1 (a int(11) NOT NULL default '0', PRIMARY KEY  (a));
+CREATE TABLE t2 (a int(11) default '0', INDEX (a));
+INSERT INTO t1 VALUES (1),(2),(3),(4);
+INSERT INTO t2 VALUES (1),(2),(3);
+SELECT t1.a, t1.a in (select t2.a from t2) FROM t1;
+a	t1.a in (select t2.a from t2)
+1	1
+2	1
+3	1
+4	0
+explain extended SELECT t1.a, t1.a in (select t2.a from t2) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	PRIMARY	4	NULL	4	100.00	Using index
+2	SUBQUERY	t2	index_subquery	a	a	5	func	2	100.00	Using index
+Warnings:
+Note	1003	select `test`.`t1`.`a` AS `a`,<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`a`) in t2 on a checking NULL having <is_not_null_test>(`test`.`t2`.`a`))))) AS `t1.a in (select t2.a from t2)` from `test`.`t1`
+CREATE TABLE t3 (a int(11) default '0');
+INSERT INTO t3 VALUES (1),(2),(3);
+SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) FROM t1;
+a	t1.a in (select t2.a from t2,t3 where t3.a=t2.a)
+1	1
+2	1
+3	1
+4	0
+explain extended SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	PRIMARY	4	NULL	4	100.00	Using index
+2	DEPENDENT SUBQUERY	t2	ref_or_null	a	a	5	func	2	100.00	Using where; Using index
+2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1003	select `test`.`t1`.`a` AS `a`,<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,<exists>(select `test`.`t2`.`a` from `test`.`t2` join `test`.`t3` where ((`test`.`t3`.`a` = `test`.`t2`.`a`) and ((<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`) or isnull(`test`.`t2`.`a`))) having <is_not_null_test>(`test`.`t2`.`a`)))) AS `t1.a in (select t2.a from t2,t3 where t3.a=t2.a)` from `test`.`t1`
+drop table t1,t2,t3;
+# check correct NULL Processing for normal IN/ALL/ANY
+# and 2 ways of max/min optimization
+create table t1 (a int);
+insert into t1 values (1), (100), (NULL), (1000);
+create table t2 (a int not null);
+# subselect returns empty set (for NULL and non-NULL left part)
+select a, a in (select * from t2) from t1;
+a	a in (select * from t2)
+1	0
+100	0
+NULL	0
+1000	0
+select a, a > any (select * from t2) from t1;
+a	a > any (select * from t2)
+1	0
+100	0
+NULL	0
+1000	0
+select a, a > all (select * from t2) from t1;
+a	a > all (select * from t2)
+1	1
+100	1
+NULL	1
+1000	1
+select a from t1 where a in (select * from t2);
+a
+select a from t1 where a > any (select * from t2);
+a
+select a from t1 where a > all (select * from t2);
+a
+1
+100
+NULL
+1000
+select a from t1 where a in (select * from t2 group by a);
+a
+select a from t1 where a > any (select * from t2 group by a);
+a
+select a from t1 where a > all (select * from t2 group by a);
+a
+1
+100
+NULL
+1000
+insert into t2 values (1),(200);
+# sebselect returns non-empty set without NULLs
+select a, a in (select * from t2) from t1;
+a	a in (select * from t2)
+1	1
+100	0
+NULL	NULL
+1000	0
+select a, a > any (select * from t2) from t1;
+a	a > any (select * from t2)
+1	0
+100	1
+NULL	NULL
+1000	1
+select a, a > all (select * from t2) from t1;
+a	a > all (select * from t2)
+1	0
+100	0
+NULL	NULL
+1000	1
+select a from t1 where a in (select * from t2);
+a
+1
+select a from t1 where a > any (select * from t2);
+a
+100
+1000
+select a from t1 where a > all (select * from t2);
+a
+1000
+select a from t1 where a in (select * from t2 group by a);
+a
+1
+select a from t1 where a > any (select * from t2 group by a);
+a
+100
+1000
+select a from t1 where a > all (select * from t2 group by a);
+a
+1000
+drop table t2;
+create table t2 (a int);
+insert into t2 values (1),(NULL),(200);
+# sebselect returns non-empty set with NULLs
+select a, a in (select * from t2) from t1;
+a	a in (select * from t2)
+1	1
+100	NULL
+NULL	NULL
+1000	NULL
+select a, a > any (select * from t2) from t1;
+a	a > any (select * from t2)
+1	NULL
+100	1
+NULL	NULL
+1000	1
+select a, a > all (select * from t2) from t1;
+a	a > all (select * from t2)
+1	0
+100	0
+NULL	NULL
+1000	NULL
+select a from t1 where a in (select * from t2);
+a
+1
+select a from t1 where a > any (select * from t2);
+a
+100
+1000
+select a from t1 where a > all (select * from t2);
+a
+select a from t1 where a in (select * from t2 group by a);
+a
+1
+select a from t1 where a > any (select * from t2 group by a);
+a
+100
+1000
+select a from t1 where a > all (select * from t2 group by a);
+a
+drop table t1, t2;
+create table t1 (a float);
+select 10.5 IN (SELECT * from t1 LIMIT 1);
+ERROR 42000: This version of MariaDB doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
+select 10.5 IN (SELECT * from t1 LIMIT 1 UNION SELECT 1.5);
+ERROR 42000: This version of MariaDB doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
+drop table t1;
+create table t1 (a int, b int, c varchar(10));
+create table t2 (a int);
+insert into t1 values (1,2,'a'),(2,3,'b'),(3,4,'c');
+insert into t2 values (1),(2),(NULL);
+select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a'),(select c from t1 where a=t2.a)  from t2;
+a	(select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a')	(select c from t1 where a=t2.a)
+1	1	a
+2	0	b
+NULL	NULL	NULL
+select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,3,'b'),(select c from t1 where a=t2.a) from t2;
+a	(select a,b,c from t1 where t1.a=t2.a) = ROW(a,3,'b')	(select c from t1 where a=t2.a)
+1	0	a
+2	1	b
+NULL	NULL	NULL
+select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c'),(select c from t1 where a=t2.a) from t2;
+a	(select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c')	(select c from t1 where a=t2.a)
+1	0	a
+2	0	b
+NULL	NULL	NULL
+drop table t1,t2;
+create table t1 (a int, b real, c varchar(10));
+insert into t1 values (1, 1, 'a'), (2,2,'b'), (NULL, 2, 'b');
+select ROW(1, 1, 'a') IN (select a,b,c from t1);
+ROW(1, 1, 'a') IN (select a,b,c from t1)
+1
+select ROW(1, 2, 'a') IN (select a,b,c from t1);
+ROW(1, 2, 'a') IN (select a,b,c from t1)
+0
+select ROW(1, 1, 'a') IN (select b,a,c from t1);
+ROW(1, 1, 'a') IN (select b,a,c from t1)
+1
+select ROW(1, 1, 'a') IN (select a,b,c from t1 where a is not null);
+ROW(1, 1, 'a') IN (select a,b,c from t1 where a is not null)
+1
+select ROW(1, 2, 'a') IN (select a,b,c from t1 where a is not null);
+ROW(1, 2, 'a') IN (select a,b,c from t1 where a is not null)
+0
+select ROW(1, 1, 'a') IN (select b,a,c from t1 where a is not null);
+ROW(1, 1, 'a') IN (select b,a,c from t1 where a is not null)
+1
+select ROW(1, 1, 'a') IN (select a,b,c from t1 where c='b' or c='a');
+ROW(1, 1, 'a') IN (select a,b,c from t1 where c='b' or c='a')
+1
+select ROW(1, 2, 'a') IN (select a,b,c from t1 where c='b' or c='a');
+ROW(1, 2, 'a') IN (select a,b,c from t1 where c='b' or c='a')
+0
+select ROW(1, 1, 'a') IN (select b,a,c from t1 where c='b' or c='a');
+ROW(1, 1, 'a') IN (select b,a,c from t1 where c='b' or c='a')
+1
+select ROW(1, 1, 'a') IN (select b,a,c from t1 limit 2);
+ERROR 42000: This version of MariaDB doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
+drop table t1;
+create table t1 (a int);
+insert into t1 values (1);
+do @a:=(SELECT a from t1);
+select @a;
+@a
+1
+set @a:=2;
+set @a:=(SELECT a from t1);
+select @a;
+@a
+1
+drop table t1;
+do (SELECT a from t1);
+ERROR 42S02: Table 'test.t1' doesn't exist
+set @a:=(SELECT a from t1);
+ERROR 42S02: Table 'test.t1' doesn't exist
+CREATE TABLE t1 (a int, KEY(a));
+HANDLER t1 OPEN;
+HANDLER t1 READ a=((SELECT 1));
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'SELECT 1))' at line 1
+HANDLER t1 CLOSE;
+drop table t1;
+create table t1 (a int);
+create table t2 (b int);
+insert into t1 values (1),(2);
+insert into t2 values (1);
+select a from t1 where a in (select a from t1 where a in (select b from t2));
+a
+1
+drop table t1, t2;
+create table t1 (a int, b int);
+create table t2 like t1;
+insert into t1 values (1,2),(1,3),(1,4),(1,5);
+insert into t2 values (1,2),(1,3);
+select * from t1 where row(a,b) in (select a,b from t2);
+a	b
+1	2
+1	3
+drop table t1, t2;
+CREATE TABLE `t1` (`i` int(11) NOT NULL default '0',PRIMARY KEY  (`i`)) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t1 VALUES (1);
+UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
+select * from t1;
+i
+2
+drop table t1;
+CREATE TABLE t1 (a int(1));
+EXPLAIN EXTENDED SELECT (SELECT RAND() FROM t1) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+2	UNCACHEABLE SUBQUERY	t1	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+Warnings:
+Note	1003	select (select rand() from `test`.`t1`) AS `(SELECT RAND() FROM t1)` from `test`.`t1`
+EXPLAIN EXTENDED SELECT (SELECT ENCRYPT('test') FROM t1) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+2	UNCACHEABLE SUBQUERY	t1	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+Warnings:
+Note	1003	select (select encrypt('test') from `test`.`t1`) AS `(SELECT ENCRYPT('test') FROM t1)` from `test`.`t1`
+EXPLAIN EXTENDED SELECT (SELECT BENCHMARK(1,1) FROM t1) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+2	UNCACHEABLE SUBQUERY	t1	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+Warnings:
+Note	1003	select (select benchmark(1,1) from `test`.`t1`) AS `(SELECT BENCHMARK(1,1) FROM t1)` from `test`.`t1`
+drop table t1;
+CREATE TABLE `t1` (
+`mot` varchar(30) character set latin1 NOT NULL default '',
+`topic` mediumint(8) unsigned NOT NULL default '0',
+`date` date NOT NULL default '0000-00-00',
+`pseudo` varchar(35) character set latin1 NOT NULL default '',
+PRIMARY KEY  (`mot`,`pseudo`,`date`,`topic`),
+KEY `pseudo` (`pseudo`,`date`,`topic`),
+KEY `topic` (`topic`)
+) ENGINE=MyISAM CHARSET=latin1 ROW_FORMAT=DYNAMIC;
+CREATE TABLE `t2` (
+`mot` varchar(30) character set latin1 NOT NULL default '',
+`topic` mediumint(8) unsigned NOT NULL default '0',
+`date` date NOT NULL default '0000-00-00',
+`pseudo` varchar(35) character set latin1 NOT NULL default '',
+PRIMARY KEY  (`mot`,`pseudo`,`date`,`topic`),
+KEY `pseudo` (`pseudo`,`date`,`topic`),
+KEY `topic` (`topic`)
+) ENGINE=MyISAM CHARSET=latin1 ROW_FORMAT=DYNAMIC;
+CREATE TABLE `t3` (
+`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
+`maxnumrep` int(10) unsigned NOT NULL default '0',
+PRIMARY KEY  (`numeropost`),
+UNIQUE KEY `maxnumrep` (`maxnumrep`)
+) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t1 VALUES ('joce','1','','joce'),('test','2','','test');
+Warnings:
+Warning	1265	Data truncated for column 'date' at row 1
+Warning	1265	Data truncated for column 'date' at row 2
+INSERT INTO t2 VALUES ('joce','1','','joce'),('test','2','','test');
+Warnings:
+Warning	1265	Data truncated for column 'date' at row 1
+Warning	1265	Data truncated for column 'date' at row 2
+INSERT INTO t3 VALUES (1,1);
+SELECT DISTINCT topic FROM t2 WHERE NOT EXISTS(SELECT * FROM t3 WHERE
+numeropost=topic);
+topic
+2
+select * from t1;
+mot	topic	date	pseudo
+joce	1	0000-00-00	joce
+test	2	0000-00-00	test
+DELETE FROM t1 WHERE topic IN (SELECT DISTINCT topic FROM t2 WHERE NOT
+EXISTS(SELECT * FROM t3 WHERE numeropost=topic));
+select * from t1;
+mot	topic	date	pseudo
+joce	1	0000-00-00	joce
+drop table t1, t2, t3;
+SELECT * FROM (SELECT 1 as a,(SELECT a)) a;
+a	(SELECT a)
+1	1
+CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT 1)) a;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(1) NOT NULL DEFAULT '0',
+  `(SELECT 1)` int(1) NOT NULL DEFAULT '0'
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t1;
+CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT a)) a;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(1) NOT NULL DEFAULT '0',
+  `(SELECT a)` int(1) NOT NULL DEFAULT '0'
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t1;
+CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT a+0)) a;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(1) NOT NULL DEFAULT '0',
+  `(SELECT a+0)` int(3) NOT NULL DEFAULT '0'
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t1;
+CREATE TABLE t1 SELECT (SELECT 1 as a UNION SELECT 1+1 limit 1,1) as a;
+select * from t1;
+a
+2
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` bigint(20) NOT NULL DEFAULT '0'
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t1;
+create table t1 (a int);
+insert into t1 values (1), (2), (3);
+explain extended select a,(select (select rand() from t1 limit 1)  from t1 limit 1)
+from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+2	UNCACHEABLE SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+3	UNCACHEABLE SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+Warnings:
+Note	1003	select `test`.`t1`.`a` AS `a`,(select (select rand() from `test`.`t1` limit 1) from `test`.`t1` limit 1) AS `(select (select rand() from t1 limit 1)  from t1 limit 1)` from `test`.`t1`
+drop table t1;
+select t1.Continent, t2.Name, t2.Population from t1 LEFT JOIN t2 ON t1.Code = t2.Country  where t2.Population IN (select max(t2.Population) AS Population from t2, t1 where t2.Country = t1.Code group by Continent);
+ERROR 42S02: Table 'test.t1' doesn't exist
+CREATE TABLE t1 (
+ID int(11) NOT NULL auto_increment,
+name char(35) NOT NULL default '',
+t2 char(3) NOT NULL default '',
+District char(20) NOT NULL default '',
+Population int(11) NOT NULL default '0',
+PRIMARY KEY  (ID)
+) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (130,'Sydney','AUS','New South Wales',3276207);
+INSERT INTO t1 VALUES (131,'Melbourne','AUS','Victoria',2865329);
+INSERT INTO t1 VALUES (132,'Brisbane','AUS','Queensland',1291117);
+CREATE TABLE t2 (
+Code char(3) NOT NULL default '',
+Name char(52) NOT NULL default '',
+Continent enum('Asia','Europe','North America','Africa','Oceania','Antarctica','South America') NOT NULL default 'Asia',
+Region char(26) NOT NULL default '',
+SurfaceArea float(10,2) NOT NULL default '0.00',
+IndepYear smallint(6) default NULL,
+Population int(11) NOT NULL default '0',
+LifeExpectancy float(3,1) default NULL,
+GNP float(10,2) default NULL,
+GNPOld float(10,2) default NULL,
+LocalName char(45) NOT NULL default '',
+GovernmentForm char(45) NOT NULL default '',
+HeadOfState char(60) default NULL,
+Capital int(11) default NULL,
+Code2 char(2) NOT NULL default '',
+PRIMARY KEY  (Code)
+) ENGINE=MyISAM;
+INSERT INTO t2 VALUES ('AUS','Australia','Oceania','Australia and New Zealand',7741220.00,1901,18886000,79.8,351182.00,392911.00,'Australia','Constitutional Monarchy, Federation','Elisabeth II',135,'AU');
+INSERT INTO t2 VALUES ('AZE','Azerbaijan','Asia','Middle East',86600.00,1991,7734000,62.9,4127.00,4100.00,'Azärbaycan','Federal Republic','Heydär Äliyev',144,'AZ');
+select t2.Continent, t1.Name, t1.Population from t2 LEFT JOIN t1 ON t2.Code = t1.t2  where t1.Population IN (select max(t1.Population) AS Population from t1, t2 where t1.t2 = t2.Code group by Continent);
+Continent	Name	Population
+Oceania	Sydney	3276207
+drop table t1, t2;
+CREATE TABLE `t1` (
+`id` mediumint(8) unsigned NOT NULL auto_increment,
+`pseudo` varchar(35) character set latin1 NOT NULL default '',
+PRIMARY KEY  (`id`),
+UNIQUE KEY `pseudo` (`pseudo`)
+) ENGINE=MyISAM PACK_KEYS=1 ROW_FORMAT=DYNAMIC;
+INSERT INTO t1 (pseudo) VALUES ('test');
+SELECT 0 IN (SELECT 1 FROM t1 a);
+0 IN (SELECT 1 FROM t1 a)
+0
+EXPLAIN EXTENDED SELECT 0 IN (SELECT 1 FROM t1 a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+Warnings:
+Note	1003	select <in_optimizer>(0,<exists>(select 1 from dual where (0 = 1))) AS `0 IN (SELECT 1 FROM t1 a)`
+INSERT INTO t1 (pseudo) VALUES ('test1');
+SELECT 0 IN (SELECT 1 FROM t1 a);
+0 IN (SELECT 1 FROM t1 a)
+0
+EXPLAIN EXTENDED SELECT 0 IN (SELECT 1 FROM t1 a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+Warnings:
+Note	1003	select <in_optimizer>(0,<exists>(select 1 from `test`.`t1` `a` where (0 = 1))) AS `0 IN (SELECT 1 FROM t1 a)`
+drop table t1;
+CREATE TABLE `t1` (
+`i` int(11) NOT NULL default '0',
+PRIMARY KEY  (`i`)
+) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t1 VALUES (1);
+UPDATE t1 SET i=i+(SELECT MAX(i) FROM (SELECT 1) t) WHERE i=(SELECT MAX(i));
+UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
+UPDATE t1 SET t.i=i+(SELECT MAX(i) FROM (SELECT 1) t);
+ERROR 42S22: Unknown column 't.i' in 'field list'
+select * from t1;
+i
+3
+drop table t1;
+CREATE TABLE t1 (
+id int(11) default NULL
+) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t1 VALUES (1),(1),(2),(2),(1),(3);
+CREATE TABLE t2 (
+id int(11) default NULL,
+name varchar(15) default NULL
+) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t2 VALUES (4,'vita'), (1,'vita'), (2,'vita'), (1,'vita');
+update t1, t2 set t2.name='lenka' where t2.id in (select id from t1);
+select * from t2;
+id	name
+4	vita
+1	lenka
+2	lenka
+1	lenka
+drop table t1,t2;
+create table t1 (a int, unique index indexa (a));
+insert into t1 values (-1), (-4), (-2), (NULL);
+select -10 IN (select a from t1 FORCE INDEX (indexa));
+-10 IN (select a from t1 FORCE INDEX (indexa))
+NULL
+drop table t1;
+create table t1 (id int not null auto_increment primary key, salary int, key(salary));
+insert into t1 (salary) values (100),(1000),(10000),(10),(500),(5000),(50000);
+explain extended SELECT id FROM t1 where salary = (SELECT MAX(salary) FROM t1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ref	salary	salary	5	const	0	0.00	Using where
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+Warnings:
+Note	1003	select `test`.`t1`.`id` AS `id` from `test`.`t1` where (`test`.`t1`.`salary` = (select max(`test`.`t1`.`salary`) from `test`.`t1`))
+drop table t1;
+CREATE TABLE t1 (
+ID int(10) unsigned NOT NULL auto_increment,
+SUB_ID int(3) unsigned NOT NULL default '0',
+REF_ID int(10) unsigned default NULL,
+REF_SUB int(3) unsigned default '0',
+PRIMARY KEY (ID,SUB_ID),
+UNIQUE KEY t1_PK (ID,SUB_ID),
+KEY t1_FK (REF_ID,REF_SUB),
+KEY t1_REFID (REF_ID)
+) ENGINE=MyISAM CHARSET=cp1251;
+INSERT INTO t1 VALUES (1,0,NULL,NULL),(2,0,NULL,NULL);
+SELECT DISTINCT REF_ID FROM t1 WHERE ID= (SELECT DISTINCT REF_ID FROM t1 WHERE ID=2);
+REF_ID
+DROP TABLE t1;
+create table t1 (a int, b int);
+create table t2 (a int, b int);
+insert into t1 values (1,0), (2,0), (3,0);
+insert into t2 values (1,1), (2,1), (3,1), (2,2);
+update ignore t1 set b=(select b from t2 where t1.a=t2.a);
+Warnings:
+Warning	1242	Subquery returns more than 1 row
+select * from t1;
+a	b
+1	1
+2	NULL
+3	1
+drop table t1, t2;
+CREATE TABLE `t1` (
+`id` mediumint(8) unsigned NOT NULL auto_increment,
+`pseudo` varchar(35) NOT NULL default '',
+`email` varchar(60) NOT NULL default '',
+PRIMARY KEY  (`id`),
+UNIQUE KEY `email` (`email`),
+UNIQUE KEY `pseudo` (`pseudo`)
+) ENGINE=MyISAM CHARSET=latin1 PACK_KEYS=1 ROW_FORMAT=DYNAMIC;
+INSERT INTO t1 (id,pseudo,email) VALUES (1,'test','test'),(2,'test1','test1');
+SELECT pseudo as a, pseudo as b FROM t1 GROUP BY (SELECT a) ORDER BY (SELECT id*1);
+a	b
+test	test
+test1	test1
+drop table if exists t1;
+(SELECT 1 as a) UNION (SELECT 1) ORDER BY (SELECT a+0);
+a
+1
+create table t1 (a int not null, b int, primary key (a));
+create table t2 (a int not null, primary key (a));
+create table t3 (a int not null, b int, primary key (a));
+insert into t1 values (1,10), (2,20), (3,30),  (4,40);
+insert into t2 values (2), (3), (4), (5);
+insert into t3 values (10,3), (20,4), (30,5);
+select * from t2 where t2.a in (select a from t1);
+a
+2
+3
+4
+explain extended select * from t2 where t2.a in (select a from t1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
+1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	4	75.00	Using where; Using index; Using join buffer (flat, BNL join)
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where (`test`.`t1`.`a` = `test`.`t2`.`a`)
+select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
+a
+2
+4
+explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
+select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
+a
+2
+3
+explain extended select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	4	75.00	Using where; Using join buffer (flat, BNL join)
+1	PRIMARY	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.b	1	100.00	Using index
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t3` join `test`.`t2` where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t3`.`a` = `test`.`t1`.`b`))
+drop table t1, t2, t3;
+create table t1 (a int, b int, index a (a,b));
+create table t2 (a int, index a (a));
+create table t3 (a int, b int, index a (a));
+insert into t1 values (1,10), (2,20), (3,30), (4,40);
+create table t0(a int);
+insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+insert into t1
+select rand()*100000+200,rand()*100000 from t0 A, t0 B, t0 C, t0 D;
+insert into t2 values (2), (3), (4), (5);
+insert into t3 values (10,3), (20,4), (30,5);
+select * from t2 where t2.a in (select a from t1);
+a
+2
+3
+4
+explain extended select * from t2 where t2.a in (select a from t1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using index; FirstMatch(t2)
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where (`test`.`t1`.`a` = `test`.`t2`.`a`)
+select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
+a
+2
+4
+explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using where; Using index; FirstMatch(t2)
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
+select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
+a
+2
+3
+explain extended select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t3	index	a	a	5	NULL	3	100.00	Using where; Using index
+1	PRIMARY	t1	ref	a	a	10	test.t2.a,test.t3.a	116	100.00	Using index; FirstMatch(t2)
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1` join `test`.`t3`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` = `test`.`t3`.`a`))
+insert into t1 values (3,31);
+select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
+a
+2
+3
+4
+select * from t2 where t2.a in (select a from t1 where t1.b <> 30 and t1.b <> 31);
+a
+2
+4
+explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using where; Using index; FirstMatch(t2)
+Warnings:
+Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
+drop table t0, t1, t2, t3;
+create table t1 (a int, b int);
+create table t2 (a int, b int);
+create table t3 (a int, b int);
+insert into t1 values (0,100),(1,2), (1,3), (2,2), (2,7), (2,-1), (3,10);
+insert into t2 values (0,0), (1,1), (2,1), (3,1), (4,1);
+insert into t3 values (3,3), (2,2), (1,1);
+select a,(select count(distinct t1.b) as sum from t1,t2 where t1.a=t2.a and t2.b > 0 and t1.a <= t3.b group by t1.a order by sum limit 1) from t3;
+a	(select count(distinct t1.b) as sum from t1,t2 where t1.a=t2.a and t2.b > 0 and t1.a <= t3.b group by t1.a order by sum limit 1)
+3	1
+2	2
+1	2
+drop table t1,t2,t3;
+create table t1 (s1 int);
+create table t2 (s1 int);
+insert into t1 values (1);
+insert into t2 values (1);
+select * from t1 where exists (select s1 from t2 having max(t2.s1)=t1.s1);
+s1
+1
+drop table t1,t2;
+create table t1 (s1 int);
+create table t2 (s1 int);
+insert into t1 values (1);
+insert into t2 values (1);
+update t1 set  s1 = s1 + 1 where 1 = (select x.s1 as A from t2 WHERE t2.s1 > t1.s1 order by A);
+ERROR 42S22: Unknown column 'x.s1' in 'field list'
+DROP TABLE t1, t2;
+CREATE TABLE t1 (s1 CHAR(5) COLLATE latin1_german1_ci,
+s2 CHAR(5) COLLATE latin1_swedish_ci);
+INSERT INTO t1 VALUES ('z','?');
+select * from t1 where s1 > (select max(s2) from t1);
+ERROR HY000: Illegal mix of collations (latin1_german1_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation '>'
+select * from t1 where s1 > any (select max(s2) from t1);
+ERROR HY000: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (latin1_german1_ci,IMPLICIT) for operation '<'
+drop table t1;
+create table t1(toid int,rd int);
+create table t2(userid int,pmnew int,pmtotal int);
+insert into t2 values(1,0,0),(2,0,0);
+insert into t1 values(1,0),(1,0),(1,0),(1,12),(1,15),(1,123),(1,12312),(1,12312),(1,123),(2,0),(2,0),(2,1),(2,2);
+select userid,pmtotal,pmnew, (select count(rd) from t1 where toid=t2.userid) calc_total, (select count(rd) from t1 where rd=0 and toid=t2.userid) calc_new from t2 where userid in (select distinct toid from t1);
+userid	pmtotal	pmnew	calc_total	calc_new
+1	0	0	9	3
+2	0	0	4	2
+drop table t1, t2;
+create table t1 (s1 char(5));
+select (select 'a','b' from t1 union select 'a','b' from t1) from t1;
+ERROR 21000: Operand should contain 1 column(s)
+insert into t1 values ('tttt');
+select * from t1 where ('a','b')=(select 'a','b' from t1 union select 'a','b' from t1);
+s1
+tttt
+explain extended (select * from t1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	100.00	
+Warnings:
+Note	1003	(select 'tttt' AS `s1` from dual)
+(select * from t1);
+s1
+tttt
+drop table t1;
+create table t1 (s1 char(5), index s1(s1));
+create table t2 (s1 char(5), index s1(s1));
+insert into t1 values ('a1'),('a2'),('a3');
+insert into t2 values ('a1'),('a2');
+select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
+s1	s1 NOT IN (SELECT s1 FROM t2)
+a1	0
+a2	0
+a3	1
+select s1, s1 = ANY (SELECT s1 FROM t2) from t1;
+s1	s1 = ANY (SELECT s1 FROM t2)
+a1	1
+a2	1
+a3	0
+select s1, s1 <> ALL (SELECT s1 FROM t2) from t1;
+s1	s1 <> ALL (SELECT s1 FROM t2)
+a1	0
+a2	0
+a3	1
+select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
+s1	s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2')
+a1	0
+a2	1
+a3	1
+explain extended select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	s1	6	NULL	3	100.00	Using index
+2	SUBQUERY	t2	index_subquery	s1	s1	6	func	2	100.00	Using index; Full scan on NULL key
+Warnings:
+Note	1003	select `test`.`t1`.`s1` AS `s1`,(not(<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))))) AS `s1 NOT IN (SELECT s1 FROM t2)` from `test`.`t1`
+explain extended select s1, s1 = ANY (SELECT s1 FROM t2) from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	s1	6	NULL	3	100.00	Using index
+2	SUBQUERY	t2	index_subquery	s1	s1	6	func	2	100.00	Using index; Full scan on NULL key
+Warnings:
+Note	1003	select `test`.`t1`.`s1` AS `s1`,<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))) AS `s1 = ANY (SELECT s1 FROM t2)` from `test`.`t1`
+explain extended select s1, s1 <> ALL (SELECT s1 FROM t2) from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	s1	6	NULL	3	100.00	Using index
+2	SUBQUERY	t2	index_subquery	s1	s1	6	func	2	100.00	Using index; Full scan on NULL key
+Warnings:
+Note	1003	select `test`.`t1`.`s1` AS `s1`,(not(<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))))) AS `s1 <> ALL (SELECT s1 FROM t2)` from `test`.`t1`
+explain extended select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	index	NULL	s1	6	NULL	3	100.00	Using index
+2	SUBQUERY	t2	index_subquery	s1	s1	6	func	2	100.00	Using index; Using where; Full scan on NULL key
+Warnings:
+Note	1003	select `test`.`t1`.`s1` AS `s1`,(not(<expr_cache><`test`.`t1`.`s1`>(<in_optimizer>(`test`.`t1`.`s1`,<exists>(<index_lookup>(<cache>(`test`.`t1`.`s1`) in t2 on s1 checking NULL where (`test`.`t2`.`s1` < 'a2') having trigcond(<is_not_null_test>(`test`.`t2`.`s1`)))))))) AS `s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2')` from `test`.`t1`
+drop table t1,t2;
+create table t2 (a int, b int not null);
+create table t3 (a int);
+insert into t3 values (6),(7),(3);
+select * from t3 where a >= all (select b from t2);
+a
+6
+7
+3
+explain extended select * from t3 where a >= all (select b from t2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+Warnings:
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where <not>(<in_optimizer>(`test`.`t3`.`a`,((select max(NULL) from `test`.`t2`) > <cache>(`test`.`t3`.`a`))))
+select * from t3 where a >= some (select b from t2);
+a
+explain extended select * from t3 where a >= some (select b from t2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+Warnings:
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(`test`.`t3`.`a`,((select min(NULL) from `test`.`t2`) <= <cache>(`test`.`t3`.`a`))))
+select * from t3 where a >= all (select b from t2 group by 1);
+a
+6
+7
+3
+explain extended select * from t3 where a >= all (select b from t2 group by 1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+Warnings:
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where <not>(<in_optimizer>(`test`.`t3`.`a`,((select max(NULL) from `test`.`t2`) > <cache>(`test`.`t3`.`a`))))
+select * from t3 where a >= some (select b from t2 group by 1);
+a
+explain extended select * from t3 where a >= some (select b from t2 group by 1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
+Warnings:
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where <nop>(<in_optimizer>(`test`.`t3`.`a`,((select min(NULL) from `test`.`t2`) <= <cache>(`test`.`t3`.`a`))))
+select * from t3 where NULL >= any (select b from t2);
+a
+explain extended select * from t3 where NULL >= any (select b from t2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
+Warnings:
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
+select * from t3 where NULL >= any (select b from t2 group by 1);
+a
+explain extended select * from t3 where NULL >= any (select b from t2 group by 1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
+Warnings:
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
+select * from t3 where NULL >= some (select b from t2);
+a
+explain extended select * from t3 where NULL >= some (select b from t2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
+Warnings:
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
+select * from t3 where NULL >= some (select b from t2 group by 1);
+a
+explain extended select * from t3 where NULL >= some (select b from t2 group by 1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
+Warnings:
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
+insert into t2 values (2,2), (2,1), (3,3), (3,1);
+select * from t3 where a > all (select max(b) from t2 group by a);
+a
+6
+7
+explain extended select * from t3 where a > all (select max(b) from t2 group by a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	4	100.00	Using temporary
+Warnings:
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where <not>(<in_optimizer>(`test`.`t3`.`a`,(<max>(select max(`test`.`t2`.`b`) from `test`.`t2` group by `test`.`t2`.`a`) >= <cache>(`test`.`t3`.`a`))))
+drop table t2, t3;
+CREATE TABLE `t1` ( `id` mediumint(9) NOT NULL auto_increment, `taskid` bigint(20) NOT NULL default '0', `dbid` int(11) NOT NULL default '0', `create_date` datetime NOT NULL default '0000-00-00 00:00:00', `last_update` datetime NOT NULL default '0000-00-00 00:00:00', PRIMARY KEY  (`id`)) ENGINE=MyISAM CHARSET=latin1 AUTO_INCREMENT=3 ;
+INSERT INTO `t1` (`id`, `taskid`, `dbid`, `create_date`,`last_update`) VALUES (1, 1, 15, '2003-09-29 10:31:36', '2003-09-29 10:31:36'), (2, 1, 21, now(), now());
+CREATE TABLE `t2` (`db_id` int(11) NOT NULL auto_increment,`name` varchar(200) NOT NULL default '',`primary_uid` smallint(6) NOT NULL default '0',`secondary_uid` smallint(6) NOT NULL default '0',PRIMARY KEY  (`db_id`),UNIQUE KEY `name_2` (`name`),FULLTEXT KEY `name` (`name`)) ENGINE=MyISAM CHARSET=latin1 AUTO_INCREMENT=2147483647;
+INSERT INTO `t2` (`db_id`, `name`, `primary_uid`, `secondary_uid`) VALUES (18, 'Not Set 1', 0, 0),(19, 'Valid', 1, 2),(20, 'Valid 2', 1, 2),(21, 'Should Not Return', 1, 2),(26, 'Not Set 2', 0, 0),(-1, 'ALL DB\'S', 0, 0);
+CREATE TABLE `t3` (`taskgenid` mediumint(9) NOT NULL auto_increment,`dbid` int(11) NOT NULL default '0',`taskid` int(11) NOT NULL default '0',`mon` tinyint(4) NOT NULL default '1',`tues` tinyint(4) NOT NULL default '1',`wed` tinyint(4) NOT NULL default '1',`thur` tinyint(4) NOT NULL default '1',`fri` tinyint(4) NOT NULL default '1',`sat` tinyint(4) NOT NULL default '0',`sun` tinyint(4) NOT NULL default '0',`how_often` smallint(6) NOT NULL default '1',`userid` smallint(6) NOT NULL default '0',`active` tinyint(4) NOT NULL default '1',PRIMARY KEY  (`taskgenid`)) ENGINE=MyISAM CHARSET=latin1 AUTO_INCREMENT=2 ;
+INSERT INTO `t3` (`taskgenid`, `dbid`, `taskid`, `mon`, `tues`,`wed`, `thur`, `fri`, `sat`, `sun`, `how_often`, `userid`, `active`) VALUES (1,-1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1);
+CREATE TABLE `t4` (`task_id` smallint(6) NOT NULL default '0',`description` varchar(200) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO `t4` (`task_id`, `description`) VALUES (1, 'Daily Check List'),(2, 'Weekly Status');
+select  dbid, name, (date_format(now() , '%Y-%m-%d') - INTERVAL how_often DAY) >= ifnull((SELECT date_format(max(create_date),'%Y-%m-%d') FROM t1 WHERE dbid = b.db_id AND taskid = a.taskgenid), '1950-01-01') from t3 a, t2 b, t4  WHERE dbid = - 1 AND primary_uid = '1' AND t4.task_id = taskid;
+dbid	name	(date_format(now() , '%Y-%m-%d') - INTERVAL how_often DAY) >= ifnull((SELECT date_format(max(create_date),'%Y-%m-%d') FROM t1 WHERE dbid = b.db_id AND taskid = a.taskgenid), '1950-01-01')
+-1	Valid	1
+-1	Valid 2	1
+-1	Should Not Return	0
+SELECT dbid, name FROM t3 a, t2 b, t4 WHERE dbid = - 1 AND primary_uid = '1' AND ((date_format(now() , '%Y-%m-%d') - INTERVAL how_often DAY) >= ifnull((SELECT date_format(max(create_date),'%Y-%m-%d') FROM t1 WHERE dbid = b.db_id AND taskid = a.taskgenid), '1950-01-01')) AND t4.task_id = taskid;
+dbid	name
+-1	Valid
+-1	Valid 2
+drop table t1,t2,t3,t4;
+CREATE TABLE t1 (id int(11) default NULL) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t1 VALUES (1),(5);
+CREATE TABLE t2 (id int(11) default NULL) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t2 VALUES (2),(6);
+select * from t1 where (1,2,6) in (select * from t2);
+ERROR 21000: Operand should contain 3 column(s)
+DROP TABLE t1,t2;
+create table t1 (s1 int);
+insert into t1 values (1);
+insert into t1 values (2);
+set sort_buffer_size = (select s1 from t1);
+ERROR 21000: Subquery returns more than 1 row
+do (select * from t1);
+Warnings:
+Error	1242	Subquery returns more than 1 row
+drop table t1;
+create table t1 (s1 char);
+insert into t1 values ('e');
+select * from t1 where 'f' > any (select s1 from t1);
+s1
+e
+select * from t1 where 'f' > any (select s1 from t1 union select s1 from t1);
+s1
+e
+explain extended select * from t1 where 'f' > any (select s1 from t1 union select s1 from t1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	100.00	
+2	SUBQUERY	t1	system	NULL	NULL	NULL	NULL	1	100.00	
+3	UNION	t1	system	NULL	NULL	NULL	NULL	1	100.00	
+NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
+Warnings:
+Note	1003	select 'e' AS `s1` from dual where 1
+drop table t1;
+CREATE TABLE t1 (number char(11) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t1 VALUES ('69294728265'),('18621828126'),('89356874041'),('95895001874');
+CREATE TABLE t2 (code char(5) NOT NULL default '',UNIQUE KEY code (code)) ENGINE=MyISAM CHARSET=latin1;
+INSERT INTO t2 VALUES ('1'),('1226'),('1245'),('1862'),('18623'),('1874'),('1967'),('6');
+select c.number as phone,(select p.code from t2 p where c.number like concat(p.code, '%') order by length(p.code) desc limit 1) as code from t1 c;
+phone	code
+69294728265	6
+18621828126	1862
+89356874041	NULL
+95895001874	NULL
+drop table t1, t2;
+create table t1 (s1 int);
+create table t2 (s1 int);
+select * from t1 where (select count(*) from t2 where t1.s2) = 1;
+ERROR 42S22: Unknown column 't1.s2' in 'where clause'
+select * from t1 where (select count(*) from t2 group by t1.s2) = 1;
+ERROR 42S22: Unknown column 't1.s2' in 'group statement'
+select count(*) from t2 group by t1.s2;
+ERROR 42S22: Unknown column 't1.s2' in 'group statement'
+drop table t1, t2;
+CREATE TABLE t1(COLA FLOAT NOT NULL,COLB FLOAT NOT NULL,COLC VARCHAR(20) DEFAULT NULL,PRIMARY KEY (COLA, COLB));
+CREATE TABLE t2(COLA FLOAT NOT NULL,COLB FLOAT NOT NULL,COLC CHAR(1) NOT NULL,PRIMARY KEY (COLA));
+INSERT INTO t1 VALUES (1,1,'1A3240'), (1,2,'4W2365');
+INSERT INTO t2 VALUES (100, 200, 'C');
+SELECT DISTINCT COLC FROM t1 WHERE COLA = (SELECT COLA FROM t2 WHERE COLB = 200 AND COLC ='C' LIMIT 1);
+COLC
+DROP TABLE t1, t2;
+CREATE TABLE t1 (a int(1));
+INSERT INTO t1 VALUES (1),(1),(1),(1),(1),(2),(3),(4),(5);
+SELECT DISTINCT (SELECT a) FROM t1 LIMIT 100;
+(SELECT a)
+1
+2
+3
+4
+5
+DROP TABLE t1;
+create table t1 (a int, b decimal(13, 3));
+insert into t1 values (1, 0.123);
+select a, (select max(b) from t1) into outfile "../../tmp/subselect.out.file.1" from t1;
+delete from t1;
+load data infile "../../tmp/subselect.out.file.1" into table t1;
+select * from t1;
+a	b
+1	0.123
+drop table t1;
+CREATE TABLE `t1` (
+`id` int(11) NOT NULL auto_increment,
+`id_cns` tinyint(3) unsigned NOT NULL default '0',
+`tipo` enum('','UNO','DUE') NOT NULL default '',
+`anno_dep` smallint(4) unsigned zerofill NOT NULL default '0000',
+`particolare` mediumint(8) unsigned NOT NULL default '0',
+`generale` mediumint(8) unsigned NOT NULL default '0',
+`bis` tinyint(3) unsigned NOT NULL default '0',
+PRIMARY KEY  (`id`),
+UNIQUE KEY `idx_cns_gen_anno` (`anno_dep`,`id_cns`,`generale`,`particolare`),
+UNIQUE KEY `idx_cns_par_anno` (`id_cns`,`anno_dep`,`tipo`,`particolare`,`bis`)
+);
+INSERT INTO `t1` VALUES (1,16,'UNO',1987,2048,9681,0),(2,50,'UNO',1987,1536,13987,0),(3,16,'UNO',1987,2432,14594,0),(4,16,'UNO',1987,1792,13422,0),(5,16,'UNO',1987,1025,10240,0),(6,16,'UNO',1987,1026,7089,0);
+CREATE TABLE `t2` (
+`id` tinyint(3) unsigned NOT NULL auto_increment,
+`max_anno_dep` smallint(6) unsigned NOT NULL default '0',
+PRIMARY KEY  (`id`)
+);
+INSERT INTO `t2` VALUES (16,1987),(50,1990),(51,1990);
+SELECT cns.id, cns.max_anno_dep, cns.max_anno_dep = (SELECT s.anno_dep FROM t1 AS s WHERE s.id_cns = cns.id ORDER BY s.anno_dep DESC LIMIT 1) AS PIPPO FROM t2 AS cns;
+id	max_anno_dep	PIPPO
+16	1987	1
+50	1990	0
+51	1990	NULL
+DROP TABLE t1, t2;
+create table t1 (a int);
+insert into t1 values (1), (2), (3);
+SET SQL_SELECT_LIMIT=1;
+select sum(a) from (select * from t1) as a;
+sum(a)
+6
+select 2 in (select * from t1);
+2 in (select * from t1)
+1
+SET SQL_SELECT_LIMIT=default;
+drop table t1;
+CREATE TABLE t1 (a int, b int, INDEX (a));
+INSERT INTO t1 VALUES (1, 1), (1, 2), (1, 3);
+SELECT * FROM t1 WHERE a = (SELECT MAX(a) FROM t1 WHERE a = 1) ORDER BY b;
+a	b
+1	1
+1	2
+1	3
+DROP TABLE t1;
+create table t1(val varchar(10));
+insert into t1 values ('aaa'), ('bbb'),('eee'),('mmm'),('ppp');
+select count(*) from t1 as w1 where w1.val in (select w2.val from t1 as w2 where w2.val like 'm%') and w1.val in (select w3.val from t1 as w3 where w3.val like 'e%');
+count(*)
+0
+drop table t1;
+create table t1 (id int not null, text varchar(20) not null default '', primary key (id));
+insert into t1 (id, text) values (1, 'text1'), (2, 'text2'), (3, 'text3'), (4, 'text4'), (5, 'text5'), (6, 'text6'), (7, 'text7'), (8, 'text8'), (9, 'text9'), (10, 'text10'), (11, 'text11'), (12, 'text12');
+select * from t1 where id not in (select id from t1 where id < 8);
+id	text
+8	text8
+9	text9
+10	text10
+11	text11
+12	text12
+select * from t1 as tt where not exists (select id from t1 where id < 8 and (id = tt.id or id is null) having id is not null);
+id	text
+8	text8
+9	text9
+10	text10
+11	text11
+12	text12
+explain extended select * from t1 where id not in (select id from t1 where id < 8);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	12	100.00	Using where
+2	DEPENDENT SUBQUERY	t1	unique_subquery	PRIMARY	PRIMARY	4	func	1	100.00	Using index; Using where
+Warnings:
+Note	1003	select `test`.`t1`.`id` AS `id`,`test`.`t1`.`text` AS `text` from `test`.`t1` where (not(<expr_cache><`test`.`t1`.`id`>(<in_optimizer>(`test`.`t1`.`id`,<exists>(<primary_index_lookup>(<cache>(`test`.`t1`.`id`) in t1 on PRIMARY where ((`test`.`t1`.`id` < 8) and (<cache>(`test`.`t1`.`id`) = `test`.`t1`.`id`))))))))
+explain extended select * from t1 as tt where not exists (select id from t1 where id < 8 and (id = tt.id or id is null) having id is not null);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	tt	ALL	NULL	NULL	NULL	NULL	12	100.00	Using where
+2	DEPENDENT SUBQUERY	t1	eq_ref	PRIMARY	PRIMARY	4	test.tt.id	1	100.00	Using where; Using index
+Warnings:
+Note	1276	Field or reference 'test.tt.id' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`tt`.`id` AS `id`,`test`.`tt`.`text` AS `text` from `test`.`t1` `tt` where (not(<in_optimizer>(1,<expr_cache><`test`.`tt`.`id`>(exists(select `test`.`t1`.`id` from `test`.`t1` where ((`test`.`t1`.`id` < 8) and (`test`.`t1`.`id` = `test`.`tt`.`id`)) having (`test`.`t1`.`id` is not null))))))
+insert into t1 (id, text) values (1000, 'text1000'), (1001, 'text1001');
+create table t2 (id int not null, text varchar(20) not null default '', primary key (id));
+insert into t2 (id, text) values (1, 'text1'), (2, 'text2'), (3, 'text3'), (4, 'text4'), (5, 'text5'), (6, 'text6'), (7, 'text7'), (8, 'text8'), (9, 'text9'), (10, 'text10'), (11, 'text1'), (12, 'text2'), (13, 'text3'), (14, 'text4'), (15, 'text5'), (16, 'text6'), (17, 'text7'), (18, 'text8'), (19, 'text9'), (20, 'text10'),(21, 'text1'), (22, 'text2'), (23, 'text3'), (24, 'text4'), (25, 'text5'), (26, 'text6'), (27, 'text7'), (28, 'text8'), (29, 'text9'), (30, 'text10'), (31, 'text1'), (32, 'text2'), (33, 'text3'), (34, 'text4'), (35, 'text5'), (36, 'text6'), (37, 'text7'), (38, 'text8'), (39, 'text9'), (40, 'text10'), (41, 'text1'), (42, 'text2'), (43, 'text3'), (44, 'text4'), (45, 'text5'), (46, 'text6'), (47, 'text7'), (48, 'text8'), (49, 'text9'), (50, 'text10');
+select * from t1 a left join t2 b on (a.id=b.id or b.id is null) join t1 c on (if(isnull(b.id), 1000, b.id)=c.id);
+id	text	id	text	id	text
+1	text1	1	text1	1	text1
+2	text2	2	text2	2	text2
+3	text3	3	text3	3	text3
+4	text4	4	text4	4	text4
+5	text5	5	text5	5	text5
+6	text6	6	text6	6	text6
+7	text7	7	text7	7	text7
+8	text8	8	text8	8	text8
+9	text9	9	text9	9	text9
+10	text10	10	text10	10	text10
+11	text11	11	text1	11	text11
+12	text12	12	text2	12	text12
+1000	text1000	NULL	NULL	1000	text1000
+1001	text1001	NULL	NULL	1000	text1000
+explain extended select * from t1 a left join t2 b on (a.id=b.id or b.id is null) join t1 c on (if(isnull(b.id), 1000, b.id)=c.id);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	a	ALL	NULL	NULL	NULL	NULL	14	100.00	
+1	SIMPLE	b	eq_ref	PRIMARY	PRIMARY	4	test.a.id	2	100.00	
+1	SIMPLE	c	eq_ref	PRIMARY	PRIMARY	4	func	1	100.00	Using index condition
+Warnings:
+Note	1003	select `test`.`a`.`id` AS `id`,`test`.`a`.`text` AS `text`,`test`.`b`.`id` AS `id`,`test`.`b`.`text` AS `text`,`test`.`c`.`id` AS `id`,`test`.`c`.`text` AS `text` from `test`.`t1` `a` left join `test`.`t2` `b` on(((`test`.`b`.`id` = `test`.`a`.`id`) or isnull(`test`.`b`.`id`))) join `test`.`t1` `c` where (if(isnull(`test`.`b`.`id`),1000,`test`.`b`.`id`) = `test`.`c`.`id`)
+drop table t1,t2;
+create table t1 (a int);
+insert into t1 values (1);
+explain select benchmark(1000, (select a from t1 where a=sha(rand())));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+2	UNCACHEABLE SUBQUERY	t1	system	NULL	NULL	NULL	NULL	1	
+drop table t1;
+create table t1(id int);
+create table t2(id int);
+create table t3(flag int);
+select (select * from t3 where id not null) from t1, t2;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'null) from t1, t2' at line 1
+drop table t1,t2,t3;
+CREATE TABLE t1 (id INT);
+CREATE TABLE t2 (id INT);
+INSERT INTO t1 VALUES (1), (2);
+INSERT INTO t2 VALUES (1);
+SELECT t1.id, ( SELECT COUNT(t.id) FROM t2 AS t WHERE t.id = t1.id ) AS c FROM t1 LEFT JOIN t2 USING (id);
+id	c
+1	1
+2	0
+SELECT id, ( SELECT COUNT(t.id) FROM t2 AS t WHERE t.id = t1.id ) AS c FROM t1 LEFT JOIN t2 USING (id);
+id	c
+1	1
+2	0
+SELECT t1.id, ( SELECT COUNT(t.id) FROM t2 AS t WHERE t.id = t1.id ) AS c FROM t1 LEFT JOIN t2 USING (id) ORDER BY t1.id;
+id	c
+1	1
+2	0
+SELECT id, ( SELECT COUNT(t.id) FROM t2 AS t WHERE t.id = t1.id ) AS c FROM t1 LEFT JOIN t2 USING (id) ORDER BY id;
+id	c
+1	1
+2	0
+DROP TABLE t1,t2;
+CREATE TABLE t1 ( a int, b int );
+INSERT INTO t1 VALUES (1,1),(2,2),(3,3);
+SELECT a FROM t1 WHERE a > ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+3
+SELECT a FROM t1 WHERE a < ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+SELECT a FROM t1 WHERE a = ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+2
+SELECT a FROM t1 WHERE a >= ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+3
+SELECT a FROM t1 WHERE a > ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+3
+SELECT a FROM t1 WHERE a < ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+SELECT a FROM t1 WHERE a = ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+2
+SELECT a FROM t1 WHERE a >= ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+3
+ALTER TABLE t1 ADD INDEX (a);
+SELECT a FROM t1 WHERE a > ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+3
+SELECT a FROM t1 WHERE a < ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+SELECT a FROM t1 WHERE a = ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+2
+SELECT a FROM t1 WHERE a >= ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ANY ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+3
+SELECT a FROM t1 WHERE a > ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+3
+SELECT a FROM t1 WHERE a < ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+SELECT a FROM t1 WHERE a = ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+2
+SELECT a FROM t1 WHERE a >= ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ALL ( SELECT a FROM t1 WHERE b = 2 );
+a
+1
+3
+SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 HAVING a = 2);
+a
+3
+SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 HAVING a = 2);
+a
+1
+SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 HAVING a = 2);
+a
+2
+SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 HAVING a = 2);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 HAVING a = 2);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 HAVING a = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 HAVING a = 2);
+a
+3
+SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 HAVING a = 2);
+a
+1
+SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 HAVING a = 2);
+a
+2
+SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 HAVING a = 2);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 HAVING a = 2);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 HAVING a = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+3
+SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+1
+SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+2
+SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+3
+SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+1
+SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+2
+SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 WHERE b = 2 UNION SELECT a FROM t1 WHERE b = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+3
+SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+1
+SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+2
+SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+3
+SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+1
+SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+2
+SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 HAVING a = 2 UNION SELECT a FROM t1 HAVING a = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE (1,2) > ANY (SELECT a FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT a FROM t1 WHERE a > ANY (SELECT a,2 FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT a FROM t1 WHERE (1,2) > ANY (SELECT a,2 FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT a FROM t1 WHERE (1,2) > ALL (SELECT a FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT a FROM t1 WHERE a > ALL (SELECT a,2 FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT a FROM t1 WHERE (1,2) > ALL (SELECT a,2 FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT a FROM t1 WHERE (1,2) = ALL (SELECT a,2 FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT a FROM t1 WHERE (1,2) <> ANY (SELECT a,2 FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT a FROM t1 WHERE (1,2) = ANY (SELECT a FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 2 column(s)
+SELECT a FROM t1 WHERE a = ANY (SELECT a,2 FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT a FROM t1 WHERE (1,2) = ANY (SELECT a,2 FROM t1 WHERE b = 2);
+a
+SELECT a FROM t1 WHERE (1,2) <> ALL (SELECT a FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 2 column(s)
+SELECT a FROM t1 WHERE a <> ALL (SELECT a,2 FROM t1 WHERE b = 2);
+ERROR 21000: Operand should contain 1 column(s)
+SELECT a FROM t1 WHERE (1,2) <> ALL (SELECT a,2 FROM t1 WHERE b = 2);
+a
+1
+2
+3
+SELECT a FROM t1 WHERE (a,1) = ANY (SELECT a,1 FROM t1 WHERE b = 2);
+a
+2
+SELECT a FROM t1 WHERE (a,1) <> ALL (SELECT a,1 FROM t1 WHERE b = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE (a,1) = ANY (SELECT a,1 FROM t1 HAVING a = 2);
+a
+2
+SELECT a FROM t1 WHERE (a,1) <> ALL (SELECT a,1 FROM t1 HAVING a = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE (a,1) = ANY (SELECT a,1 FROM t1 WHERE b = 2 UNION SELECT a,1 FROM t1 WHERE b = 2);
+a
+2
+SELECT a FROM t1 WHERE (a,1) <> ALL (SELECT a,1 FROM t1 WHERE b = 2 UNION SELECT a,1 FROM t1 WHERE b = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE (a,1) = ANY (SELECT a,1 FROM t1 HAVING a = 2 UNION SELECT a,1 FROM t1 HAVING a = 2);
+a
+2
+SELECT a FROM t1 WHERE (a,1) <> ALL (SELECT a,1 FROM t1 HAVING a = 2 UNION SELECT a,1 FROM t1 HAVING a = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+3
+SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+1
+SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+2
+SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+1
+3
+SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+3
+SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+1
+SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+2
+SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 WHERE b = 2 group by a);
+a
+1
+3
+SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 group by a HAVING a = 2);
+a
+3
+SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 group by a HAVING a = 2);
+a
+1
+SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 group by a HAVING a = 2);
+a
+2
+SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 group by a HAVING a = 2);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 group by a HAVING a = 2);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 group by a HAVING a = 2);
+a
+1
+3
+SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 group by a HAVING a = 2);
+a
+3
+SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 group by a HAVING a = 2);
+a
+1
+SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 group by a HAVING a = 2);
+a
+2
+SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 group by a HAVING a = 2);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 group by a HAVING a = 2);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 group by a HAVING a = 2);
+a
+1
+3
+SELECT concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a > t1.a), '-') from t1 a;
+concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a > t1.a), '-')
+0-
+0-
+1-
+SELECT concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a < t1.a), '-') from t1 a;
+concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a < t1.a), '-')
+1-
+0-
+0-
+SELECT concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a = t1.a), '-') from t1 a;
+concat(EXISTS(SELECT a FROM t1 WHERE b = 2 and a.a = t1.a), '-')
+0-
+1-
+0-
+DROP TABLE t1;
+CREATE TABLE t1 ( a double, b double );
+INSERT INTO t1 VALUES (1,1),(2,2),(3,3);
+SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 WHERE b = 2e0);
+a
+3
+SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 WHERE b = 2e0);
+a
+1
+SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 WHERE b = 2e0);
+a
+2
+SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 WHERE b = 2e0);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 WHERE b = 2e0);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 WHERE b = 2e0);
+a
+1
+3
+SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 WHERE b = 2e0);
+a
+3
+SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 WHERE b = 2e0);
+a
+1
+SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 WHERE b = 2e0);
+a
+2
+SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 WHERE b = 2e0);
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 WHERE b = 2e0);
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 WHERE b = 2e0);
+a
+1
+3
+DROP TABLE t1;
+CREATE TABLE t1 ( a char(1), b char(1));
+INSERT INTO t1 VALUES ('1','1'),('2','2'),('3','3');
+SELECT a FROM t1 WHERE a > ANY (SELECT a FROM t1 WHERE b = '2');
+a
+3
+SELECT a FROM t1 WHERE a < ANY (SELECT a FROM t1 WHERE b = '2');
+a
+1
+SELECT a FROM t1 WHERE a = ANY (SELECT a FROM t1 WHERE b = '2');
+a
+2
+SELECT a FROM t1 WHERE a >= ANY (SELECT a FROM t1 WHERE b = '2');
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ANY (SELECT a FROM t1 WHERE b = '2');
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ANY (SELECT a FROM t1 WHERE b = '2');
+a
+1
+3
+SELECT a FROM t1 WHERE a > ALL (SELECT a FROM t1 WHERE b = '2');
+a
+3
+SELECT a FROM t1 WHERE a < ALL (SELECT a FROM t1 WHERE b = '2');
+a
+1
+SELECT a FROM t1 WHERE a = ALL (SELECT a FROM t1 WHERE b = '2');
+a
+2
+SELECT a FROM t1 WHERE a >= ALL (SELECT a FROM t1 WHERE b = '2');
+a
+2
+3
+SELECT a FROM t1 WHERE a <= ALL (SELECT a FROM t1 WHERE b = '2');
+a
+1
+2
+SELECT a FROM t1 WHERE a <> ALL (SELECT a FROM t1 WHERE b = '2');
+a
+1
+3
+DROP TABLE t1;
+create table t1 (a int, b int);
+insert into t1 values (1,2),(3,4);
+select * from t1 up where exists (select * from t1 where t1.a=up.a);
+a	b
+1	2
+3	4
+explain extended select * from t1 up where exists (select * from t1 where t1.a=up.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	up	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	100.00	
+2	MATERIALIZED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+Warnings:
+Note	1276	Field or reference 'test.up.a' of SELECT #2 was resolved in SELECT #1
+Note	1003	select `test`.`up`.`a` AS `a`,`test`.`up`.`b` AS `b` from `test`.`t1` `up` semi join (`test`.`t1`) where 1
+drop table t1;
+CREATE TABLE t1 (t1_a int);
+INSERT INTO t1 VALUES (1);
+CREATE TABLE t2 (t2_a int, t2_b int, PRIMARY KEY (t2_a, t2_b));
+INSERT INTO t2 VALUES (1, 1), (1, 2);
+SELECT * FROM t1, t2 table2 WHERE t1_a = 1 AND table2.t2_a = 1
+HAVING table2.t2_b = (SELECT MAX(t2_b) FROM t2 WHERE t2_a = table2.t2_a);
+t1_a	t2_a	t2_b
+1	1	2
+DROP TABLE t1, t2;
+CREATE TABLE t1 (id int(11) default NULL,name varchar(10) default NULL);
+INSERT INTO t1 VALUES (1,'Tim'),(2,'Rebecca'),(3,NULL);
+CREATE TABLE t2 (id int(11) default NULL, pet varchar(10) default NULL);
+INSERT INTO t2 VALUES (1,'Fido'),(2,'Spot'),(3,'Felix');
+SELECT a.*, b.* FROM (SELECT * FROM t1) AS a JOIN t2 as b on a.id=b.id;
+id	name	id	pet
+1	Tim	1	Fido
+2	Rebecca	2	Spot
+3	NULL	3	Felix
+drop table t1,t2;
+CREATE TABLE t1 ( a int, b int );
+CREATE TABLE t2 ( c int, d int );
+INSERT INTO t1 VALUES (1,2), (2,3), (3,4);
+SELECT a AS abc, b FROM t1 outr WHERE b =
+(SELECT MIN(b) FROM t1 WHERE a=outr.a);
+abc	b
+1	2
+2	3
+3	4
+INSERT INTO t2 SELECT a AS abc, b FROM t1 outr WHERE b =
+(SELECT MIN(b) FROM t1 WHERE a=outr.a);
+select * from t2;
+c	d
+1	2
+2	3
+3	4
+CREATE TABLE t3 SELECT a AS abc, b FROM t1 outr WHERE b =
+(SELECT MIN(b) FROM t1 WHERE a=outr.a);
+select * from t3;
+abc	b
+1	2
+2	3
+3	4
+prepare stmt1 from "INSERT INTO t2 SELECT a AS abc, b FROM t1 outr WHERE b = (SELECT MIN(b) FROM t1 WHERE a=outr.a);";
+execute stmt1;
+deallocate prepare stmt1;
+select * from t2;
+c	d
+1	2
+2	3
+3	4
+1	2
+2	3
+3	4
+drop table t3;
+prepare stmt1 from "CREATE TABLE t3 SELECT a AS abc, b FROM t1 outr WHERE b = (SELECT MIN(b) FROM t1 WHERE a=outr.a);";
+execute stmt1;
+select * from t3;
+abc	b
+1	2
+2	3
+3	4
+deallocate prepare stmt1;
+DROP TABLE t1, t2, t3;
+CREATE TABLE `t1` ( `a` int(11) default NULL) ENGINE=MyISAM DEFAULT CHARSET=latin1;
+insert into t1 values (1);
+CREATE TABLE `t2` ( `b` int(11) default NULL, `a` int(11) default NULL) ENGINE=MyISAM DEFAULT CHARSET=latin1;
+insert into t2 values (1,2);
+select t000.a, count(*) `C` FROM t1 t000 GROUP BY t000.a HAVING count(*) > ALL (SELECT count(*) FROM t2 t001 WHERE t001.a=1);
+a	C
+1	1
+drop table t1,t2;
+create table t1 (a int not null auto_increment primary key, b varchar(40), fulltext(b));
+insert into t1 (b) values ('ball'),('ball games'), ('games'), ('foo'), ('foobar'), ('Serg'), ('Sergei'),('Georg'), ('Patrik'),('Hakan');
+create table t2 (a int);
+insert into t2 values (1),(3),(2),(7);
+select a,b from t1 where match(b) against ('Ball') > 0;
+a	b
+1	ball
+2	ball games
+select a from t2 where a in (select a from t1 where match(b) against ('Ball') > 0);
+a
+1
+2
+drop table t1,t2;
+CREATE TABLE t1(`IZAVORGANG_ID` VARCHAR(11) CHARACTER SET latin1 COLLATE latin1_bin,`KUERZEL` VARCHAR(10) CHARACTER SET latin1 COLLATE latin1_bin,`IZAANALYSEART_ID` VARCHAR(11) CHARACTER SET latin1 COLLATE latin1_bin,`IZAPMKZ_ID` VARCHAR(11) CHARACTER SET latin1 COLLATE latin1_bin);
+CREATE INDEX AK01IZAVORGANG ON t1(izaAnalyseart_id,Kuerzel);
+INSERT INTO t1(`IZAVORGANG_ID`,`KUERZEL`,`IZAANALYSEART_ID`,`IZAPMKZ_ID`)VALUES('D0000000001','601','D0000000001','I0000000001');
+INSERT INTO t1(`IZAVORGANG_ID`,`KUERZEL`,`IZAANALYSEART_ID`,`IZAPMKZ_ID`)VALUES('D0000000002','602','D0000000001','I0000000001');
+INSERT INTO t1(`IZAVORGANG_ID`,`KUERZEL`,`IZAANALYSEART_ID`,`IZAPMKZ_ID`)VALUES('D0000000003','603','D0000000001','I0000000001');
+INSERT INTO t1(`IZAVORGANG_ID`,`KUERZEL`,`IZAANALYSEART_ID`,`IZAPMKZ_ID`)VALUES('D0000000004','101','D0000000001','I0000000001');
+SELECT `IZAVORGANG_ID` FROM t1 WHERE `KUERZEL` IN(SELECT MIN(`KUERZEL`)`Feld1` FROM t1 WHERE `KUERZEL` LIKE'601%'And`IZAANALYSEART_ID`='D0000000001');
+IZAVORGANG_ID
+D0000000001
+drop table t1;
+CREATE TABLE `t1` ( `aid` int(11) NOT NULL default '0', `bid` int(11) NOT NULL default '0', PRIMARY KEY  (`aid`,`bid`));
+CREATE TABLE `t2` ( `aid` int(11) NOT NULL default '0', `bid` int(11) NOT NULL default '0', PRIMARY KEY  (`aid`,`bid`));
+insert into t1 values (1,1),(1,2),(2,1),(2,2);
+insert into t2 values (1,2),(2,2);
+select * from t1 where t1.aid not in (select aid from t2 where bid=t1.bid);
+aid	bid
+1	1
+2	1
+alter table t2 drop primary key;
+alter table t2 add key KEY1 (aid, bid);
+select * from t1 where t1.aid not in (select aid from t2 where bid=t1.bid);
+aid	bid
+1	1
+2	1
+alter table t2 drop key KEY1;
+alter table t2 add primary key (bid, aid);
+select * from t1 where t1.aid not in (select aid from t2 where bid=t1.bid);
+aid	bid
+1	1
+2	1
+drop table t1,t2;
+CREATE TABLE t1 (howmanyvalues bigint, avalue int);
+INSERT INTO t1 VALUES (1, 1),(2, 1),(2, 2),(3, 1),(3, 2),(3, 3),(4, 1),(4, 2),(4, 3),(4, 4);
+SELECT howmanyvalues, count(*) from t1 group by howmanyvalues;
+howmanyvalues	count(*)
+1	1
+2	2
+3	3
+4	4
+SELECT a.howmanyvalues, (SELECT count(*) from t1 b where b.howmanyvalues = a.howmanyvalues) as mycount from t1 a group by a.howmanyvalues;
+howmanyvalues	mycount
+1	1
+2	2
+3	3
+4	4
+CREATE INDEX t1_howmanyvalues_idx ON t1 (howmanyvalues);
+SELECT a.howmanyvalues, (SELECT count(*) from t1 b where b.howmanyvalues+1 = a.howmanyvalues+1) as mycount from t1 a group by a.howmanyvalues;
+howmanyvalues	mycount
+1	1
+2	2
+3	3
+4	4
+SELECT a.howmanyvalues, (SELECT count(*) from t1 b where b.howmanyvalues = a.howmanyvalues) as mycount from t1 a group by a.howmanyvalues;
+howmanyvalues	mycount
+1	1
+2	2
+3	3
+4	4
+SELECT a.howmanyvalues, (SELECT count(*) from t1 b where b.howmanyvalues = a.avalue) as mycount from t1 a group by a.howmanyvalues;
+howmanyvalues	mycount
+1	1
+2	1
+3	1
+4	1
+drop table t1;
+create table t1 (x int);
+select  (select b.x from t1 as b where b.x=a.x) from t1 as a where a.x=2 group by a.x;
+(select b.x from t1 as b where b.x=a.x)
+drop table t1;
+CREATE TABLE `t1` ( `master` int(10) unsigned NOT NULL default '0', `map` smallint(6) unsigned NOT NULL default '0', `slave` int(10) unsigned NOT NULL default '0', `access` int(10) unsigned NOT NULL default '0', UNIQUE KEY `access_u` (`master`,`map`,`slave`));
+INSERT INTO `t1` VALUES (1,0,0,700),(1,1,1,400),(1,5,5,400),(1,12,12,400),(1,12,32,400),(4,12,32,400);
+CREATE TABLE `t2` ( `id` int(10) unsigned NOT NULL default '0', `pid` int(10) unsigned NOT NULL default '0', `map` smallint(6) unsigned NOT NULL default '0', `level` tinyint(4) unsigned NOT NULL default '0', `title` varchar(255) default NULL, PRIMARY KEY  (`id`,`pid`,`map`), KEY `level` (`level`), KEY `id` (`id`,`map`)) ;
+INSERT INTO `t2` VALUES (6,5,12,7,'a'),(12,0,0,7,'a'),(12,1,0,7,'a'),(12,5,5,7,'a'),(12,5,12,7,'a');
+SELECT b.sc FROM (SELECT (SELECT a.access FROM t1 a WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac FROM t2 op WHERE op.id = 12 AND op.map = 0) b;
+ERROR 42S22: Unknown column 'b.sc' in 'field list'
+SELECT b.ac FROM (SELECT (SELECT a.access FROM t1 a WHERE a.map = op.map AND a.slave = op.pid AND a.master = 1) ac FROM t2 op WHERE op.id = 12 AND op.map = 0) b;
+ac
+700
+NULL
+drop tables t1,t2;
+create table t1 (a int not null, b int not null, c int, primary key (a,b));
+insert into t1 values (1,1,1), (2,2,2), (3,3,3);
+set @b:= 0;
+explain select sum(a) from t1 where b > @b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	PRIMARY	8	NULL	3	Using where; Using index
+set @a:= (select sum(a) from t1 where b > @b);
+explain select a from t1 where c=2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+do @a:= (select sum(a) from t1 where b > @b);
+explain select a from t1 where c=2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+drop table t1;
+set @got_val= (SELECT 1 FROM (SELECT 'A' as my_col) as T1 ) ;
+create table t1 (a int, b int);
+create table t2 (a int, b int);
+insert into t1 values (1,1),(1,2),(1,3),(2,4),(2,5);
+insert into t2 values (1,3),(2,1);
+select distinct a,b, (select max(b) from t2 where t1.b=t2.a) from t1 order by t1.b;
+a	b	(select max(b) from t2 where t1.b=t2.a)
+1	1	3
+1	2	1
+1	3	NULL
+2	4	NULL
+2	5	NULL
+drop table t1, t2;
+create table t1 (id int);
+create table t2 (id int, body text, fulltext (body));
+insert into t1 values(1),(2),(3);
+insert into t2 values (1,'test'), (2,'mysql'), (3,'test'), (4,'test');
+select count(distinct id) from t1 where id in (select id from t2 where match(body) against ('mysql' in boolean mode));
+count(distinct id)
+1
+drop table t2,t1;
+create table t1 (s1 int,s2 int);
+insert into t1 values (20,15);
+select * from t1 where  (('a',null) <=> (select 'a',s2 from t1 where s1 = 0));
+s1	s2
+drop table t1;
+create table t1 (s1 int);
+insert into t1 values (1),(null);
+select * from t1 where s1 < all (select s1 from t1);
+s1
+select s1, s1 < all (select s1 from t1) from t1;
+s1	s1 < all (select s1 from t1)
+1	0
+NULL	NULL
+drop table t1;
+CREATE TABLE t1 (
+Code char(3) NOT NULL default '',
+Name char(52) NOT NULL default '',
+Continent enum('Asia','Europe','North America','Africa','Oceania','Antarctica','South America') NOT NULL default 'Asia',
+Region char(26) NOT NULL default '',
+SurfaceArea float(10,2) NOT NULL default '0.00',
+IndepYear smallint(6) default NULL,
+Population int(11) NOT NULL default '0',
+LifeExpectancy float(3,1) default NULL,
+GNP float(10,2) default NULL,
+GNPOld float(10,2) default NULL,
+LocalName char(45) NOT NULL default '',
+GovernmentForm char(45) NOT NULL default '',
+HeadOfState char(60) default NULL,
+Capital int(11) default NULL,
+Code2 char(2) NOT NULL default ''
+) ENGINE=MyISAM;
+INSERT INTO t1 VALUES ('XXX','Xxxxx','Oceania','Xxxxxx',26.00,0,0,0,0,0,'Xxxxx','Xxxxx','Xxxxx',NULL,'XX');
+INSERT INTO t1 VALUES ('ASM','American Samoa','Oceania','Polynesia',199.00,0,68000,75.1,334.00,NULL,'Amerika Samoa','US Territory','George W. Bush',54,'AS');
+INSERT INTO t1 VALUES ('ATF','French Southern territories','Antarctica','Antarctica',7780.00,0,0,NULL,0.00,NULL,'Terres australes françaises','Nonmetropolitan Territory of France','Jacques Chirac',NULL,'TF');
+INSERT INTO t1 VALUES ('UMI','United States Minor Outlying Islands','Oceania','Micronesia/Caribbean',16.00,0,0,NULL,0.00,NULL,'United States Minor Outlying Islands','Dependent Territory of the US','George W. Bush',NULL,'UM');
+/*!40000 ALTER TABLE t1 ENABLE KEYS */;
+SELECT DISTINCT Continent AS c FROM t1 outr WHERE
+Code <> SOME ( SELECT Code FROM t1 WHERE Continent = outr.Continent AND
+Population < 200);
+c
+Oceania
+drop table t1;
+create table t1 (a1 int);
+create table t2 (b1 int);
+select * from t1 where a2 > any(select b1 from t2);
+ERROR 42S22: Unknown column 'a2' in 'IN/ALL/ANY subquery'
+select * from t1 where a1 > any(select b1 from t2);
+a1
+drop table t1,t2;
+create table t1 (a integer, b integer);
+select (select * from t1) = (select 1,2);
+(select * from t1) = (select 1,2)
+NULL
+select (select 1,2) = (select * from t1);
+(select 1,2) = (select * from t1)
+NULL
+select  row(1,2) = ANY (select * from t1);
+row(1,2) = ANY (select * from t1)
+0
+select  row(1,2) != ALL (select * from t1);
+row(1,2) != ALL (select * from t1)
+1
+drop table t1;
+create table t1 (a integer, b integer);
+select row(1,(2,2)) in (select * from t1 );
+ERROR 21000: Operand should contain 2 column(s)
+select row(1,(2,2)) = (select * from t1 );
+ERROR 21000: Operand should contain 2 column(s)
+select (select * from t1) = row(1,(2,2));
+ERROR 21000: Operand should contain 1 column(s)
+drop table t1;
+create  table t1 (a integer);
+insert into t1 values (1);
+select 1 = ALL (select 1 from t1 where 1 = xx ), 1 as xx ;
+ERROR 42S22: Reference 'xx' not supported (forward reference in item list)
+select 1 = ALL (select 1 from t1 where 1 = xx ), 1 as xx;
+ERROR 42S22: Reference 'xx' not supported (forward reference in item list)
+select 1 as xx, 1 = ALL (  select 1 from t1 where 1 = xx );
+xx	1 = ALL (  select 1 from t1 where 1 = xx )
+1	1
+select 1 = ALL (select 1 from t1 where 1 = xx ), 1 as xx;
+ERROR 42S22: Reference 'xx' not supported (forward reference in item list)
+select 1 = ALL (select 1 from t1 where 1 = xx ), 1 as xx from DUAL;
+ERROR 42S22: Reference 'xx' not supported (forward reference in item list)
+drop table t1;
+CREATE TABLE t1 (
+categoryId int(11) NOT NULL,
+courseId int(11) NOT NULL,
+startDate datetime NOT NULL,
+endDate datetime NOT NULL,
+createDate datetime NOT NULL,
+modifyDate timestamp NOT NULL,
+attributes text NOT NULL
+);
+INSERT INTO t1 VALUES (1,41,'2004-02-09','2010-01-01','2004-02-09','2004-02-09',''),
+(1,86,'2004-08-16','2004-08-16','2004-08-16','2004-08-16',''),
+(1,87,'2004-08-16','2004-08-16','2004-08-16','2004-08-16',''),
+(2,52,'2004-03-15','2004-10-01','2004-03-15','2004-09-17',''),
+(2,53,'2004-03-16','2004-10-01','2004-03-16','2004-09-17',''),
+(2,88,'2004-08-16','2004-08-16','2004-08-16','2004-08-16',''),
+(2,89,'2004-08-16','2004-08-16','2004-08-16','2004-08-16',''),
+(3,51,'2004-02-09','2010-01-01','2004-02-09','2004-02-09',''),
+(5,12,'2004-02-18','2010-01-01','2004-02-18','2004-02-18','');
+CREATE TABLE t2 (
+userId int(11) NOT NULL,
+courseId int(11) NOT NULL,
+date datetime NOT NULL
+);
+INSERT INTO t2 VALUES (5141,71,'2003-11-18'),
+(5141,72,'2003-11-25'),(5141,41,'2004-08-06'),
+(5141,52,'2004-08-06'),(5141,53,'2004-08-06'),
+(5141,12,'2004-08-06'),(5141,86,'2004-10-21'),
+(5141,87,'2004-10-21'),(5141,88,'2004-10-21'),
+(5141,89,'2004-10-22'),(5141,51,'2004-10-26');
+CREATE TABLE t3 (
+groupId int(11) NOT NULL,
+parentId int(11) NOT NULL,
+startDate datetime NOT NULL,
+endDate datetime NOT NULL,
+createDate datetime NOT NULL,
+modifyDate timestamp NOT NULL,
+ordering int(11)
+);
+INSERT INTO t3 VALUES (12,9,'1000-01-01','3999-12-31','2004-01-29','2004-01-29',NULL);
+CREATE TABLE t4 (
+id int(11) NOT NULL,
+groupTypeId int(11) NOT NULL,
+groupKey varchar(50) NOT NULL,
+name text,
+ordering int(11),
+description text,
+createDate datetime NOT NULL,
+modifyDate timestamp NOT NULL
+);
+INSERT INTO t4 VALUES (9,5,'stationer','stationer',0,'Stationer','2004-01-29','2004-01-29'),
+(12,5,'group2','group2',0,'group2','2004-01-29','2004-01-29');
+CREATE TABLE t5 (
+userId int(11) NOT NULL,
+groupId int(11) NOT NULL,
+createDate datetime NOT NULL,
+modifyDate timestamp NOT NULL
+);
+INSERT INTO t5 VALUES (5141,12,'2004-08-06','2004-08-06');
+select
+count(distinct t2.userid) pass,
+groupstuff.*,
+count(t2.courseid) crse,
+t1.categoryid,
+t2.courseid,
+date_format(date, '%b%y') as colhead
+from t2
+join t1 on t2.courseid=t1.courseid
+join
+(
+select
+t5.userid,
+parentid,
+parentgroup,
+childid,
+groupname,
+grouptypeid
+from t5
+join
+(
+select t4.id as parentid,
+t4.name as parentgroup,
+t4.id as childid,
+t4.name as groupname,
+t4.grouptypeid
+from t4
+) as gin on t5.groupid=gin.childid
+) as groupstuff on t2.userid = groupstuff.userid
+group by
+groupstuff.groupname, colhead , t2.courseid;
+pass	userid	parentid	parentgroup	childid	groupname	grouptypeid	crse	categoryid	courseid	colhead
+1	5141	12	group2	12	group2	5	1	5	12	Aug04
+1	5141	12	group2	12	group2	5	1	1	41	Aug04
+1	5141	12	group2	12	group2	5	1	2	52	Aug04
+1	5141	12	group2	12	group2	5	1	2	53	Aug04
+1	5141	12	group2	12	group2	5	1	3	51	Oct04
+1	5141	12	group2	12	group2	5	1	1	86	Oct04
+1	5141	12	group2	12	group2	5	1	1	87	Oct04
+1	5141	12	group2	12	group2	5	1	2	88	Oct04
+1	5141	12	group2	12	group2	5	1	2	89	Oct04
+drop table t1, t2, t3, t4, t5;
+create table t1 (a int);
+insert into t1 values (1), (2), (3);
+SELECT 1 FROM t1 WHERE (SELECT 1) in (SELECT 1);
+1
+1
+1
+1
+drop table t1;
+create table t1 (a int);
+create table t2 (a int);
+insert into t1 values (1),(2);
+insert into t2 values (0),(1),(2),(3);
+select a from t2 where a in (select a from t1);
+a
+1
+2
+select a from t2 having a in (select a from t1);
+a
+1
+2
+prepare stmt1 from "select a from t2 where a in (select a from t1)";
+execute stmt1;
+a
+1
+2
+execute stmt1;
+a
+1
+2
+deallocate prepare stmt1;
+prepare stmt1 from "select a from t2 having a in (select a from t1)";
+execute stmt1;
+a
+1
+2
+execute stmt1;
+a
+1
+2
+deallocate prepare stmt1;
+drop table t1, t2;
+create table t1 (a int, b int);
+insert into t1 values (1,2);
+select 1 = (select * from t1);
+ERROR 21000: Operand should contain 1 column(s)
+select (select * from t1) = 1;
+ERROR 21000: Operand should contain 2 column(s)
+select (1,2) = (select a from t1);
+ERROR 21000: Operand should contain 2 column(s)
+select (select a from t1) = (1,2);
+ERROR 21000: Operand should contain 1 column(s)
+select (1,2,3) = (select * from t1);
+ERROR 21000: Operand should contain 3 column(s)
+select (select * from t1) = (1,2,3);
+ERROR 21000: Operand should contain 2 column(s)
+drop table t1;
+CREATE TABLE `t1` (
+`itemid` bigint(20) unsigned NOT NULL auto_increment,
+`sessionid` bigint(20) unsigned default NULL,
+`time` int(10) unsigned NOT NULL default '0',
+`type` set('A','D','E','F','G','I','L','N','U') collate latin1_general_ci NOT
+NULL default '',
+`data` text collate latin1_general_ci NOT NULL,
+PRIMARY KEY  (`itemid`)
+) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;
+INSERT INTO `t1` VALUES (1, 1, 1, 'D', '');
+CREATE TABLE `t2` (
+`sessionid` bigint(20) unsigned NOT NULL auto_increment,
+`pid` int(10) unsigned NOT NULL default '0',
+`date` int(10) unsigned NOT NULL default '0',
+`ip` varchar(15) collate latin1_general_ci NOT NULL default '',
+PRIMARY KEY  (`sessionid`)
+) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;
+INSERT INTO `t2` VALUES (1, 1, 1, '10.10.10.1');
+SELECT s.ip, count( e.itemid ) FROM `t1` e JOIN t2 s ON s.sessionid = e.sessionid WHERE e.sessionid = ( SELECT sessionid FROM t2 ORDER BY sessionid DESC LIMIT 1 ) GROUP BY s.ip HAVING count( e.itemid ) >0 LIMIT 0 , 30;
+ip	count( e.itemid )
+10.10.10.1	1
+drop tables t1,t2;
+create table t1 (fld enum('0','1'));
+insert into t1 values ('1');
+select * from (select max(fld) from t1) as foo;
+max(fld)
+1
+drop table t1;
+set @tmp11867_optimizer_switch=@@optimizer_switch;
+set optimizer_switch='semijoin_with_cache=off';
+CREATE TABLE t1 (one int, two int, flag char(1));
+CREATE TABLE t2 (one int, two int, flag char(1));
+INSERT INTO t1 VALUES(1,2,'Y'),(2,3,'Y'),(3,4,'Y'),(5,6,'N'),(7,8,'N');
+INSERT INTO t2 VALUES(1,2,'Y'),(2,3,'Y'),(3,4,'Y'),(5,6,'N'),(7,8,'N');
+SELECT * FROM t1
+WHERE ROW(one,two) IN (SELECT DISTINCT one,two FROM t2 WHERE flag = 'N');
+one	two	flag
+5	6	N
+7	8	N
+SELECT * FROM t1
+WHERE ROW(one,two) IN (SELECT DISTINCT one,two FROM t1 WHERE flag = 'N');
+one	two	flag
+5	6	N
+7	8	N
+insert into t2 values (null,null,'N');
+insert into t2 values (null,3,'0');
+insert into t2 values (null,5,'0');
+insert into t2 values (10,null,'0');
+insert into t1 values (10,3,'0');
+insert into t1 values (10,5,'0');
+insert into t1 values (10,10,'0');
+SELECT one,two,ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = 'N') as 'test' from t1;
+one	two	test
+1	2	NULL
+2	3	NULL
+3	4	NULL
+5	6	1
+7	8	1
+10	3	NULL
+10	5	NULL
+10	10	NULL
+SELECT one,two from t1 where ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = 'N');
+one	two
+5	6
+7	8
+SELECT one,two,ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = 'N' group by one,two) as 'test' from t1;
+one	two	test
+1	2	NULL
+2	3	NULL
+3	4	NULL
+5	6	1
+7	8	1
+10	3	NULL
+10	5	NULL
+10	10	NULL
+SELECT one,two,ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = '0') as 'test' from t1;
+one	two	test
+1	2	0
+2	3	NULL
+3	4	0
+5	6	0
+7	8	0
+10	3	NULL
+10	5	NULL
+10	10	NULL
+SELECT one,two,ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = '0' group by one,two) as 'test' from t1;
+one	two	test
+1	2	0
+2	3	NULL
+3	4	0
+5	6	0
+7	8	0
+10	3	NULL
+10	5	NULL
+10	10	NULL
+explain extended SELECT one,two,ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = '0') as 'test' from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	8	100.00	
+2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	9	100.00	Using where
+Warnings:
+Note	1003	select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two`,<expr_cache><`test`.`t1`.`one`,`test`.`t1`.`two`>(<in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),<exists>(select `test`.`t2`.`one`,`test`.`t2`.`two` from `test`.`t2` where ((`test`.`t2`.`flag` = '0') and trigcond(trigcond(((<cache>(`test`.`t1`.`one`) = `test`.`t2`.`one`) or isnull(`test`.`t2`.`one`)))) and trigcond(trigcond(((<cache>(`test`.`t1`.`two`) = `test`.`t2`.`two`) or isnull(`test`.`t2`.`two`))))) having (trigcond(<is_not_null_test>(`test`.`t2`.`one`)) and trigcond(<is_not_null_test>(`test`.`t2`.`two`)))))) AS `test` from `test`.`t1`
+explain extended SELECT one,two from t1 where ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = 'N');
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	8	100.00	
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	8	func,func	1	100.00	
+2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	9	100.00	Using where
+Warnings:
+Note	1003	select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`flag` = 'N'))
+explain extended SELECT one,two,ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = '0' group by one,two) as 'test' from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	8	100.00	
+2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	9	100.00	Using where
+Warnings:
+Note	1003	select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two`,<expr_cache><`test`.`t1`.`one`,`test`.`t1`.`two`>(<in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),<exists>(select `test`.`t2`.`one`,`test`.`t2`.`two` from `test`.`t2` where ((`test`.`t2`.`flag` = '0') and trigcond(trigcond(((<cache>(`test`.`t1`.`one`) = `test`.`t2`.`one`) or isnull(`test`.`t2`.`one`)))) and trigcond(trigcond(((<cache>(`test`.`t1`.`two`) = `test`.`t2`.`two`) or isnull(`test`.`t2`.`two`))))) having (trigcond(<is_not_null_test>(`test`.`t2`.`one`)) and trigcond(<is_not_null_test>(`test`.`t2`.`two`)))))) AS `test` from `test`.`t1`
+DROP TABLE t1,t2;
+set optimizer_switch=@tmp11867_optimizer_switch;
+CREATE TABLE t1 (a char(5), b char(5));
+INSERT INTO t1 VALUES (NULL,'aaa'), ('aaa','aaa');
+SELECT * FROM t1 WHERE (a,b) IN (('aaa','aaa'), ('aaa','bbb'));
+a	b
+aaa	aaa
+DROP TABLE t1;
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (a int, b int);
+CREATE TABLE t3 (b int NOT NULL);
+INSERT INTO t1 VALUES (1), (2), (3), (4);
+INSERT INTO t2 VALUES (1,10), (3,30);
+SELECT * FROM t2 LEFT JOIN t3 ON t2.b=t3.b
+WHERE t3.b IS NOT NULL OR t2.a > 10;
+a	b	b
+SELECT * FROM t1
+WHERE t1.a NOT IN (SELECT a FROM t2 LEFT JOIN t3 ON t2.b=t3.b
+WHERE t3.b IS NOT NULL OR t2.a > 10);
+a
+1
+2
+3
+4
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (f1 INT);
+CREATE TABLE t2 (f2 INT);
+INSERT INTO t1 VALUES (1);
+SELECT * FROM t1 WHERE f1 > ALL (SELECT f2 FROM t2);
+f1
+1
+SELECT * FROM t1 WHERE f1 > ALL (SELECT f2 FROM t2 WHERE 1=0);
+f1
+1
+INSERT INTO t2 VALUES (1);
+INSERT INTO t2 VALUES (2);
+SELECT * FROM t1 WHERE f1 > ALL (SELECT f2 FROM t2 WHERE f2=0);
+f1
+1
+DROP TABLE t1, t2;
+select 1 from dual where 1 < any (select 2);
+1
+1
+select 1 from dual where 1 < all (select 2);
+1
+1
+select 1 from dual where 2 > any (select 1);
+1
+1
+select 1 from dual where 2 > all (select 1);
+1
+1
+select 1 from dual where 1 < any (select 2 from dual);
+1
+1
+select 1 from dual where 1 < all (select 2 from dual where 1!=1);
+1
+1
+create table t1 (s1 char);
+insert into t1 values (1),(2);
+select * from t1 where (s1 < any (select s1 from t1));
+s1
+1
+select * from t1 where not (s1 < any (select s1 from t1));
+s1
+2
+select * from t1 where (s1 < ALL (select s1+1 from t1));
+s1
+1
+select * from t1 where not(s1 < ALL (select s1+1 from t1));
+s1
+2
+select * from t1 where (s1+1 = ANY (select s1 from t1));
+s1
+1
+select * from t1 where NOT(s1+1 = ANY (select s1 from t1));
+s1
+2
+select * from t1 where (s1 = ALL (select s1/s1 from t1));
+s1
+1
+select * from t1 where NOT(s1 = ALL (select s1/s1 from t1));
+s1
+2
+drop table t1;
+create table t1 (
+retailerID varchar(8) NOT NULL,
+statusID   int(10) unsigned NOT NULL,
+changed    datetime NOT NULL,
+UNIQUE KEY retailerID (retailerID, statusID, changed)
+);
+INSERT INTO t1 VALUES("0026", "1", "2005-12-06 12:18:56");
+INSERT INTO t1 VALUES("0026", "2", "2006-01-06 12:25:53");
+INSERT INTO t1 VALUES("0037", "1", "2005-12-06 12:18:56");
+INSERT INTO t1 VALUES("0037", "2", "2006-01-06 12:25:53");
+INSERT INTO t1 VALUES("0048", "1", "2006-01-06 12:37:50");
+INSERT INTO t1 VALUES("0059", "1", "2006-01-06 12:37:50");
+select * from t1 r1
+where (r1.retailerID,(r1.changed)) in
+(SELECT r2.retailerId,(max(changed)) from t1 r2
+group by r2.retailerId);
+retailerID	statusID	changed
+0026	2	2006-01-06 12:25:53
+0037	2	2006-01-06 12:25:53
+0048	1	2006-01-06 12:37:50
+0059	1	2006-01-06 12:37:50
+drop table t1;
+create table t1(a int, primary key (a));
+insert into t1 values (10);
+create table t2 (a int primary key, b varchar(32), c int, unique key b(c, b));
+insert into t2(a, c, b) values (1,10,'359'), (2,10,'35988'), (3,10,'35989');
+explain SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
+ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
+             ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	system	PRIMARY	NULL	NULL	NULL	1	
+1	PRIMARY	r	const	PRIMARY	PRIMARY	4	const	1	
+2	SUBQUERY	t2	range	b	b	40	NULL	2	Using where
+SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
+ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
+            ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
+a	a	b
+10	3	35989
+explain SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
+ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
+            ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	system	PRIMARY	NULL	NULL	NULL	1	
+1	PRIMARY	r	const	PRIMARY	PRIMARY	4	const	1	
+2	SUBQUERY	t2	range	b	b	40	NULL	2	Using index condition
+SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r
+ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
+            ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
+a	a	b
+10	1	359
+drop table t1,t2;
+CREATE TABLE t1 (
+field1 int NOT NULL,
+field2 int NOT NULL,
+field3 int NOT NULL,
+PRIMARY KEY  (field1,field2,field3)
+);
+CREATE TABLE t2 (
+fieldA int NOT NULL,
+fieldB int NOT NULL,
+PRIMARY KEY  (fieldA,fieldB)
+);
+INSERT INTO t1 VALUES
+(1,1,1), (1,1,2), (1,2,1), (1,2,2), (1,2,3), (1,3,1);
+INSERT INTO t2 VALUES (1,1), (1,2), (1,3);
+SELECT field1, field2, COUNT(*)
+FROM t1 GROUP BY field1, field2;
+field1	field2	COUNT(*)
+1	1	2
+1	2	3
+1	3	1
+SELECT field1, field2
+FROM  t1
+GROUP BY field1, field2
+HAVING COUNT(*) >= ALL (SELECT fieldB
+FROM t2 WHERE fieldA = field1);
+field1	field2
+1	2
+SELECT field1, field2
+FROM  t1
+GROUP BY field1, field2
+HAVING COUNT(*) < ANY (SELECT fieldB
+FROM t2 WHERE fieldA = field1);
+field1	field2
+1	1
+1	3
+DROP TABLE t1, t2;
+CREATE TABLE t1(a int, INDEX (a));
+INSERT INTO t1 VALUES (1), (3), (5), (7);
+INSERT INTO t1 VALUES (NULL);
+CREATE TABLE t2(a int);
+INSERT INTO t2 VALUES (1),(2),(3);
+EXPLAIN SELECT a, a IN (SELECT a FROM t1) FROM t2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	3	
+2	SUBQUERY	t1	index_subquery	a	a	5	func	2	Using index; Full scan on NULL key
+SELECT a, a IN (SELECT a FROM t1) FROM t2;
+a	a IN (SELECT a FROM t1)
+1	1
+2	NULL
+3	1
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a DATETIME);
+INSERT INTO t1 VALUES ('1998-09-23'), ('2003-03-25');
+CREATE TABLE t2 AS SELECT
+(SELECT a FROM t1 WHERE a < '2000-01-01') AS sub_a
+FROM t1 WHERE a > '2000-01-01';
+SHOW CREATE TABLE t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `sub_a` datetime DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+CREATE TABLE t3 AS (SELECT a FROM t1 WHERE a < '2000-01-01') UNION (SELECT a FROM t1 WHERE a > '2000-01-01');
+SHOW CREATE TABLE t3;
+Table	Create Table
+t3	CREATE TABLE `t3` (
+  `a` datetime DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (1), (2);
+SELECT a FROM t1 WHERE (SELECT 1 FROM DUAL WHERE 1=0) > 0;
+a
+SELECT a FROM t1 WHERE (SELECT 1 FROM DUAL WHERE 1=0) IS NULL;
+a
+1
+2
+EXPLAIN SELECT a FROM t1 WHERE (SELECT 1 FROM DUAL WHERE 1=0) IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+DROP TABLE t1;
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (2), (4), (1), (3);
+CREATE TABLE t2 (b int, c int);
+INSERT INTO t2 VALUES
+(2,1), (1,3), (2,1), (4,4), (2,2), (1,4);
+SELECT a FROM t1 ORDER BY (SELECT c FROM t2 WHERE b > 2 );
+a
+2
+4
+1
+3
+SELECT a FROM t1 ORDER BY (SELECT c FROM t2 WHERE b > 1);
+ERROR 21000: Subquery returns more than 1 row
+SELECT a FROM t1 ORDER BY (SELECT c FROM t2 WHERE b > 2), a;
+a
+1
+2
+3
+4
+SELECT a FROM t1 ORDER BY (SELECT c FROM t2 WHERE b > 1), a;
+ERROR 21000: Subquery returns more than 1 row
+SELECT b, MAX(c) FROM t2 GROUP BY b, (SELECT c FROM t2 WHERE b > 2);
+b	MAX(c)
+1	4
+2	2
+4	4
+SELECT b, MAX(c) FROM t2 GROUP BY b, (SELECT c FROM t2 WHERE b > 1);
+ERROR 21000: Subquery returns more than 1 row
+SELECT a FROM t1 GROUP BY a
+HAVING IFNULL((SELECT b FROM t2 WHERE b > 2),
+(SELECT c FROM t2 WHERE c=a AND b > 2 ORDER BY b)) > 3;
+a
+1
+2
+3
+4
+SELECT a FROM t1 GROUP BY a
+HAVING IFNULL((SELECT b FROM t2 WHERE b > 1),
+(SELECT c FROM t2 WHERE c=a AND b > 2 ORDER BY b)) > 3;
+ERROR 21000: Subquery returns more than 1 row
+SELECT a FROM t1 GROUP BY a
+HAVING IFNULL((SELECT b FROM t2 WHERE b > 4),
+(SELECT c FROM t2 WHERE c=a AND b > 2 ORDER BY b)) > 3;
+a
+4
+SELECT a FROM t1 GROUP BY a
+HAVING IFNULL((SELECT b FROM t2 WHERE b > 4),
+(SELECT c FROM t2 WHERE c=a AND b > 1 ORDER BY b)) > 3;
+ERROR 21000: Subquery returns more than 1 row
+SELECT a FROM t1
+ORDER BY IFNULL((SELECT b FROM t2 WHERE b > 2),
+(SELECT c FROM t2 WHERE c=a AND b > 2 ORDER BY b));
+a
+1
+2
+3
+4
+SELECT a FROM t1
+ORDER BY IFNULL((SELECT b FROM t2 WHERE b > 1),
+(SELECT c FROM t2 WHERE c=a AND b > 1 ORDER BY b));
+ERROR 21000: Subquery returns more than 1 row
+SELECT a FROM t1
+ORDER BY IFNULL((SELECT b FROM t2 WHERE b > 4),
+(SELECT c FROM t2 WHERE c=a AND b > 2 ORDER BY b));
+a
+1
+2
+3
+4
+SELECT a FROM t1
+ORDER BY IFNULL((SELECT b FROM t2 WHERE b > 4),
+(SELECT c FROM t2 WHERE c=a AND b > 1 ORDER BY b));
+ERROR 21000: Subquery returns more than 1 row
+DROP TABLE t1,t2;
+create table t1 (df decimal(5,1));
+insert into t1 values(1.1);
+insert into t1 values(2.2);
+select * from t1 where df <= all (select avg(df) from t1 group by df);
+df
+1.1
+select * from t1 where df >= all (select avg(df) from t1 group by df);
+df
+2.2
+drop table t1;
+create table t1 (df decimal(5,1));
+insert into t1 values(1.1);
+select 1.1 * exists(select * from t1);
+1.1 * exists(select * from t1)
+1.1
+drop table t1;
+CREATE TABLE t1 (
+grp int(11) default NULL,
+a decimal(10,2) default NULL);
+insert into t1 values (1, 1), (2, 2), (2, 3), (3, 4), (3, 5), (3, 6), (NULL, NULL);
+select * from t1;
+grp	a
+1	1.00
+2	2.00
+2	3.00
+3	4.00
+3	5.00
+3	6.00
+NULL	NULL
+select min(a) from t1 group by grp;
+min(a)
+NULL
+1.00
+2.00
+4.00
+drop table t1;
+CREATE table t1 ( c1 integer );
+INSERT INTO t1 VALUES ( 1 );
+INSERT INTO t1 VALUES ( 2 );
+INSERT INTO t1 VALUES ( 3 );
+CREATE TABLE t2 ( c2 integer );
+INSERT INTO t2 VALUES ( 1 );
+INSERT INTO t2 VALUES ( 4 );
+INSERT INTO t2 VALUES ( 5 );
+SELECT * FROM t1 LEFT JOIN t2 ON c1 = c2 WHERE c2 IN (1);
+c1	c2
+1	1
+SELECT * FROM t1 LEFT JOIN t2 ON c1 = c2
+WHERE c2 IN ( SELECT c2 FROM t2 WHERE c2 IN ( 1 ) );
+c1	c2
+1	1
+DROP TABLE t1,t2;
+CREATE TABLE t1 ( c1 integer );
+INSERT INTO t1 VALUES ( 1 );
+INSERT INTO t1 VALUES ( 2 );
+INSERT INTO t1 VALUES ( 3 );
+INSERT INTO t1 VALUES ( 6 );
+CREATE TABLE t2 ( c2 integer );
+INSERT INTO t2 VALUES ( 1 );
+INSERT INTO t2 VALUES ( 4 );
+INSERT INTO t2 VALUES ( 5 );
+INSERT INTO t2 VALUES ( 6 );
+CREATE TABLE t3 ( c3 integer );
+INSERT INTO t3 VALUES ( 7 );
+INSERT INTO t3 VALUES ( 8 );
+SELECT c1,c2 FROM t1 LEFT JOIN t2 ON c1 = c2
+WHERE EXISTS (SELECT c3 FROM t3 WHERE c2 IS NULL );
+c1	c2
+2	NULL
+3	NULL
+DROP TABLE t1,t2,t3;
+CREATE TABLE `t1` (
+`itemid` bigint(20) unsigned NOT NULL auto_increment,
+`sessionid` bigint(20) unsigned default NULL,
+`time` int(10) unsigned NOT NULL default '0',
+`type` set('A','D','E','F','G','I','L','N','U') collate latin1_general_ci NOT
+NULL default '',
+`data` text collate latin1_general_ci NOT NULL,
+PRIMARY KEY  (`itemid`)
+) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;
+INSERT INTO `t1` VALUES (1, 1, 1, 'D', '');
+CREATE TABLE `t2` (
+`sessionid` bigint(20) unsigned NOT NULL auto_increment,
+`pid` int(10) unsigned NOT NULL default '0',
+`date` int(10) unsigned NOT NULL default '0',
+`ip` varchar(15) collate latin1_general_ci NOT NULL default '',
+PRIMARY KEY  (`sessionid`)
+) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;
+INSERT INTO `t2` VALUES (1, 1, 1, '10.10.10.1');
+SELECT s.ip, count( e.itemid ) FROM `t1` e JOIN t2 s ON s.sessionid = e.sessionid WHERE e.sessionid = ( SELECT sessionid FROM t2 ORDER BY sessionid DESC LIMIT 1 ) GROUP BY s.ip HAVING count( e.itemid ) >0 LIMIT 0 , 30;
+ip	count( e.itemid )
+10.10.10.1	1
+drop tables t1,t2;
+CREATE TABLE t1 (EMPNUM   CHAR(3));
+CREATE TABLE t2 (EMPNUM   CHAR(3) );
+INSERT INTO t1 VALUES ('E1'),('E2');
+INSERT INTO t2 VALUES ('E1');
+DELETE FROM t1
+WHERE t1.EMPNUM NOT IN
+(SELECT t2.EMPNUM
+FROM t2
+WHERE t1.EMPNUM = t2.EMPNUM);
+select * from t1;
+EMPNUM
+E1
+DROP TABLE t1,t2;
+CREATE TABLE t1(select_id BIGINT, values_id BIGINT);
+INSERT INTO t1 VALUES (1, 1);
+CREATE TABLE t2 (select_id BIGINT, values_id BIGINT,
+PRIMARY KEY(select_id,values_id));
+INSERT INTO t2 VALUES (0, 1), (0, 2), (0, 3), (1, 5);
+SELECT values_id FROM t1
+WHERE values_id IN (SELECT values_id FROM t2
+WHERE select_id IN (1, 0));
+values_id
+1
+SELECT values_id FROM t1
+WHERE values_id IN (SELECT values_id FROM t2
+WHERE select_id BETWEEN 0 AND 1);
+values_id
+1
+SELECT values_id FROM t1
+WHERE values_id IN (SELECT values_id FROM t2
+WHERE select_id = 0 OR select_id = 1);
+values_id
+1
+DROP TABLE t1, t2;
+create table t1 (fld enum('0','1'));
+insert into t1 values ('1');
+select * from (select max(fld) from t1) as foo;
+max(fld)
+1
+drop table t1;
+CREATE TABLE t1 (a int, b int);
+CREATE TABLE t2 (c int, d int);
+CREATE TABLE t3 (e int);
+INSERT INTO t1 VALUES
+(1,10), (2,10), (1,20), (2,20), (3,20), (2,30), (4,40);
+INSERT INTO t2 VALUES
+(2,10), (2,20), (4,10), (5,10), (3,20), (2,40);
+INSERT INTO t3 VALUES (10), (30), (10), (20) ;
+SELECT a, MAX(b), MIN(b) FROM t1 GROUP BY a;
+a	MAX(b)	MIN(b)
+1	20	10
+2	30	10
+3	20	20
+4	40	40
+SELECT * FROM t2;
+c	d
+2	10
+2	20
+4	10
+5	10
+3	20
+2	40
+SELECT * FROM t3;
+e
+10
+30
+10
+20
+SELECT a FROM t1 GROUP BY a
+HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>20);
+a
+2
+4
+SELECT a FROM t1 GROUP BY a
+HAVING a IN (SELECT c FROM t2 WHERE MAX(b)<d);
+a
+2
+SELECT a FROM t1 GROUP BY a
+HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>d);
+a
+2
+4
+SELECT a FROM t1 GROUP BY a
+HAVING a IN (SELECT c FROM t2
+WHERE d >= SOME(SELECT e FROM t3 WHERE MAX(b)=e));
+a
+2
+3
+SELECT a FROM t1 GROUP BY a
+HAVING a IN (SELECT c FROM t2
+WHERE  EXISTS(SELECT e FROM t3 WHERE MAX(b)=e AND e <= d));
+a
+2
+3
+SELECT a FROM t1 GROUP BY a
+HAVING a IN (SELECT c FROM t2
+WHERE d > SOME(SELECT e FROM t3 WHERE MAX(b)=e));
+a
+2
+SELECT a FROM t1 GROUP BY a
+HAVING a IN (SELECT c FROM t2
+WHERE  EXISTS(SELECT e FROM t3 WHERE MAX(b)=e AND e < d));
+a
+2
+SELECT a FROM t1 GROUP BY a
+HAVING a IN (SELECT c FROM t2
+WHERE MIN(b) < d AND
+EXISTS(SELECT e FROM t3 WHERE MAX(b)=e AND e <= d));
+a
+2
+SELECT a, SUM(a) FROM t1 GROUP BY a;
+a	SUM(a)
+1	2
+2	6
+3	3
+4	4
+SELECT a FROM t1
+WHERE EXISTS(SELECT c FROM t2 GROUP BY c HAVING SUM(a) = c) GROUP BY a;
+a
+3
+4
+SELECT a FROM t1 GROUP BY a
+HAVING EXISTS(SELECT c FROM t2 GROUP BY c HAVING SUM(a) = c);
+a
+1
+3
+4
+SELECT a FROM t1
+WHERE a < 3 AND
+EXISTS(SELECT c FROM t2 GROUP BY c HAVING SUM(a) != c) GROUP BY a;
+a
+1
+2
+SELECT a FROM t1
+WHERE a < 3 AND
+EXISTS(SELECT c FROM t2 GROUP BY c HAVING SUM(a) != c);
+a
+1
+2
+1
+2
+2
+SELECT t1.a FROM t1 GROUP BY t1.a
+HAVING t1.a < ALL(SELECT t2.c FROM t2 GROUP BY t2.c
+HAVING EXISTS(SELECT t3.e FROM t3 GROUP BY t3.e
+HAVING SUM(t1.a+t2.c) < t3.e/4));
+a
+1
+2
+SELECT t1.a FROM t1 GROUP BY t1.a
+HAVING t1.a > ALL(SELECT t2.c FROM t2
+WHERE EXISTS(SELECT t3.e FROM t3 GROUP BY t3.e
+HAVING SUM(t1.a+t2.c) < t3.e/4));
+a
+4
+SELECT t1.a FROM t1 GROUP BY t1.a
+HAVING t1.a > ALL(SELECT t2.c FROM t2
+WHERE EXISTS(SELECT t3.e FROM t3
+WHERE SUM(t1.a+t2.c) < t3.e/4));
+ERROR HY000: Invalid use of group function
+SELECT t1.a from t1 GROUP BY t1.a HAVING AVG(SUM(t1.b)) > 20;
+ERROR HY000: Invalid use of group function
+SELECT t1.a FROM t1 GROUP BY t1.a
+HAVING t1.a IN (SELECT t2.c FROM t2 GROUP BY t2.c
+HAVING AVG(t2.c+SUM(t1.b)) > 20);
+a
+2
+3
+4
+SELECT t1.a FROM t1 GROUP BY t1.a
+HAVING t1.a IN (SELECT t2.c FROM t2 GROUP BY t2.c
+HAVING AVG(SUM(t1.b)) > 20);
+a
+2
+4
+SELECT t1.a, SUM(b) AS sum  FROM t1 GROUP BY t1.a
+HAVING t1.a IN (SELECT t2.c FROM t2 GROUP BY t2.c
+HAVING t2.c+sum > 20);
+a	sum
+2	60
+3	20
+4	40
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (a varchar(5), b varchar(10));
+INSERT INTO t1 VALUES
+('AAA', 5), ('BBB', 4), ('BBB', 1), ('CCC', 2),
+('CCC', 7), ('AAA', 2), ('AAA', 4), ('BBB', 3), ('AAA', 8);
+SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a);
+a	b
+BBB	4
+CCC	7
+AAA	8
+EXPLAIN
+SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	21	test.t1.a,test.t1.b	1	
+2	MATERIALIZED	t1	ALL	NULL	NULL	NULL	NULL	9	Using temporary
+ALTER TABLE t1 ADD INDEX(a);
+SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a);
+a	b
+BBB	4
+CCC	7
+AAA	8
+EXPLAIN
+SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	a	NULL	NULL	NULL	9	Using where
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	21	test.t1.a,test.t1.b	1	
+2	MATERIALIZED	t1	ALL	NULL	NULL	NULL	NULL	9	Using temporary
+DROP TABLE t1;
+create table t1( f1 int,f2 int);
+insert into t1 values (1,1),(2,2);
+select tt.t from (select 'crash1' as t, f2 from t1) as tt left join t1 on tt.t = 'crash2' and tt.f2 = t1.f2 where tt.t = 'crash1';
+t
+crash1
+crash1
+drop table t1;
+create table t1 (c int, key(c));
+insert into t1 values (1142477582), (1142455969);
+create table t2 (a int, b int);
+insert into t2 values (2, 1), (1, 0);
+delete from t1 where c <= 1140006215 and (select b from t2 where a = 2) = 1;
+drop table t1, t2;
+CREATE TABLE t1 (a INT);
+CREATE VIEW v1 AS SELECT * FROM t1 WHERE no_such_column = ANY (SELECT 1);
+ERROR 42S22: Unknown column 'no_such_column' in 'where clause'
+CREATE VIEW v2 AS SELECT * FROM t1 WHERE no_such_column = (SELECT 1);
+ERROR 42S22: Unknown column 'no_such_column' in 'where clause'
+SELECT * FROM t1 WHERE no_such_column = ANY (SELECT 1);
+ERROR 42S22: Unknown column 'no_such_column' in 'IN/ALL/ANY subquery'
+DROP TABLE t1;
+create table t1 (i int, j bigint);
+insert into t1 values (1, 2), (2, 2), (3, 2);
+select * from (select min(i) from t1 where j=(select * from (select min(j) from t1) t2)) t3;
+min(i)
+1
+drop table t1;
+CREATE TABLE t1 (i BIGINT UNSIGNED);
+INSERT INTO t1 VALUES (10000000000000000000);
+INSERT INTO t1 VALUES (1);
+CREATE TABLE t2 (i BIGINT UNSIGNED);
+INSERT INTO t2 VALUES (10000000000000000000);
+INSERT INTO t2 VALUES (1);
+/* simple test */
+SELECT t1.i FROM t1 JOIN t2 ON t1.i = t2.i;
+i
+10000000000000000000
+1
+/* subquery test */
+SELECT t1.i FROM t1 WHERE t1.i = (SELECT MAX(i) FROM t2);
+i
+10000000000000000000
+/* subquery test with cast*/
+SELECT t1.i FROM t1 WHERE t1.i = CAST((SELECT MAX(i) FROM t2) AS UNSIGNED);
+i
+10000000000000000000
+DROP TABLE t1;
+DROP TABLE t2;
+CREATE TABLE t1 (
+id bigint(20) unsigned NOT NULL auto_increment,
+name varchar(255) NOT NULL,
+PRIMARY KEY  (id)
+);
+INSERT INTO t1 VALUES
+(1, 'Balazs'), (2, 'Joe'), (3, 'Frank');
+CREATE TABLE t2 (
+id bigint(20) unsigned NOT NULL auto_increment,
+mid bigint(20) unsigned NOT NULL,
+date date NOT NULL,
+PRIMARY KEY  (id)
+);
+INSERT INTO t2 VALUES
+(1, 1, '2006-03-30'), (2, 2, '2006-04-06'), (3, 3, '2006-04-13'),
+(4, 2, '2006-04-20'), (5, 1, '2006-05-01');
+SELECT *,
+(SELECT date FROM t2 WHERE mid = t1.id
+ORDER BY date DESC LIMIT 0, 1) AS date_last,
+(SELECT date FROM t2 WHERE mid = t1.id
+ORDER BY date DESC LIMIT 3, 1) AS date_next_to_last
+FROM t1;
+id	name	date_last	date_next_to_last
+1	Balazs	2006-05-01	NULL
+2	Joe	2006-04-20	NULL
+3	Frank	2006-04-13	NULL
+SELECT *,
+(SELECT COUNT(*) FROM t2 WHERE mid = t1.id
+ORDER BY date DESC LIMIT 1, 1) AS date_count
+FROM t1;
+id	name	date_count
+1	Balazs	NULL
+2	Joe	NULL
+3	Frank	NULL
+SELECT *,
+(SELECT date FROM t2 WHERE mid = t1.id
+ORDER BY date DESC LIMIT 0, 1) AS date_last,
+(SELECT date FROM t2 WHERE mid = t1.id
+ORDER BY date DESC LIMIT 1, 1) AS date_next_to_last
+FROM t1;
+id	name	date_last	date_next_to_last
+1	Balazs	2006-05-01	2006-03-30
+2	Joe	2006-04-20	2006-04-06
+3	Frank	2006-04-13	NULL
+DROP TABLE t1,t2;
+CREATE TABLE t1 (
+i1 int(11) NOT NULL default '0',
+i2 int(11) NOT NULL default '0',
+t datetime NOT NULL default '0000-00-00 00:00:00',
+PRIMARY KEY  (i1,i2,t)
+);
+INSERT INTO t1 VALUES
+(24,1,'2005-03-03 16:31:31'),(24,1,'2005-05-27 12:40:07'),
+(24,1,'2005-05-27 12:40:08'),(24,1,'2005-05-27 12:40:10'),
+(24,1,'2005-05-27 12:40:25'),(24,1,'2005-05-27 12:40:30'),
+(24,2,'2005-03-03 13:43:05'),(24,2,'2005-03-03 16:23:31'),
+(24,2,'2005-03-03 16:31:30'),(24,2,'2005-05-27 12:37:02'),
+(24,2,'2005-05-27 12:40:06');
+CREATE TABLE t2 (
+i1 int(11) NOT NULL default '0',
+i2 int(11) NOT NULL default '0',
+t datetime default NULL,
+PRIMARY KEY  (i1)
+);
+INSERT INTO t2 VALUES (24,1,'2006-06-20 12:29:40');
+EXPLAIN
+SELECT * FROM t1,t2
+WHERE t1.t = (SELECT t1.t FROM t1
+WHERE t1.t < t2.t  AND t1.i2=1 AND t2.i1=t1.i1
+ORDER BY t1.t DESC LIMIT 1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	system	NULL	NULL	NULL	NULL	1	
+1	PRIMARY	t1	index	NULL	PRIMARY	16	NULL	11	Using where; Using index
+2	SUBQUERY	t1	range	PRIMARY	PRIMARY	16	NULL	5	Using where; Using index
+SELECT * FROM t1,t2
+WHERE t1.t = (SELECT t1.t FROM t1
+WHERE t1.t < t2.t  AND t1.i2=1 AND t2.i1=t1.i1
+ORDER BY t1.t DESC LIMIT 1);
+i1	i2	t	i1	i2	t
+24	1	2005-05-27 12:40:30	24	1	2006-06-20 12:29:40
+DROP TABLE t1, t2;
+CREATE TABLE t1 (i INT);
+(SELECT i FROM t1) UNION (SELECT i FROM t1);
+i
+SELECT sql_no_cache * FROM t1 WHERE NOT EXISTS
+(
+(SELECT i FROM t1) UNION
+(SELECT i FROM t1)
+);
+i
+SELECT * FROM t1
+WHERE NOT EXISTS (((SELECT i FROM t1) UNION (SELECT i FROM t1)));
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION (SELECT i FROM t1)))' at line 2
+explain select ((select t11.i from t1 t11) union (select t12.i from t1 t12))
+from t1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'union (select t12.i from t1 t12))
+from t1' at line 1
+explain select * from t1 where not exists
+((select t11.i from t1 t11) union (select t12.i from t1 t12));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	0	const row not found
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
+3	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
+NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
+DROP TABLE t1;
+CREATE TABLE t1 (a VARCHAR(250), b INT auto_increment, PRIMARY KEY (b));
+insert into t1 (a) values (FLOOR(rand() * 100));
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+insert into t1 (a) select FLOOR(rand() * 100) from t1;
+SELECT a,
+(SELECT REPEAT(' ',250) FROM t1 i1
+WHERE i1.b=t1.a ORDER BY RAND() LIMIT 1) AS a
+FROM t1 ORDER BY a LIMIT 5;
+a	a
+0	NULL
+0	NULL
+0	NULL
+0	NULL
+0	NULL
+DROP TABLE t1;
+CREATE TABLE t1 (a INT, b INT);
+CREATE TABLE t2 (a INT);
+INSERT INTO t2 values (1);
+INSERT INTO t1 VALUES (1,1),(1,2),(2,3),(3,4);
+SELECT (SELECT COUNT(DISTINCT t1.b) from t2) FROM t1 GROUP BY t1.a;
+(SELECT COUNT(DISTINCT t1.b) from t2)
+2
+1
+1
+SELECT (SELECT COUNT(DISTINCT t1.b) from t2 union select 1 from t2 where 12 < 3)
+FROM t1 GROUP BY t1.a;
+(SELECT COUNT(DISTINCT t1.b) from t2 union select 1 from t2 where 12 < 3)
+2
+1
+1
+SELECT COUNT(DISTINCT t1.b), (SELECT COUNT(DISTINCT t1.b)) FROM t1 GROUP BY t1.a;
+COUNT(DISTINCT t1.b)	(SELECT COUNT(DISTINCT t1.b))
+2	2
+1	1
+1	1
+SELECT COUNT(DISTINCT t1.b),
+(SELECT COUNT(DISTINCT t1.b) union select 1 from DUAL where 12 < 3)
+FROM t1 GROUP BY t1.a;
+COUNT(DISTINCT t1.b)	(SELECT COUNT(DISTINCT t1.b) union select 1 from DUAL where 12 < 3)
+2	2
+1	1
+1	1
+SELECT (
+SELECT (
+SELECT COUNT(DISTINCT t1.b)
+)
+)
+FROM t1 GROUP BY t1.a;
+(
+SELECT (
+SELECT COUNT(DISTINCT t1.b)
+)
+)
+2
+1
+1
+SELECT (
+SELECT (
+SELECT (
+SELECT COUNT(DISTINCT t1.b)
+)
+)
+FROM t1 GROUP BY t1.a LIMIT 1)
+FROM t1 t2
+GROUP BY t2.a;
+(
+SELECT (
+SELECT (
+SELECT COUNT(DISTINCT t1.b)
+)
+)
+FROM t1 GROUP BY t1.a LIMIT 1)
+2
+2
+2
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a int, b int, PRIMARY KEY (b));
+CREATE TABLE t2 (x int auto_increment, y int, z int,
+PRIMARY KEY (x), FOREIGN KEY (y) REFERENCES t1 (b));
+create table t3 (a int);
+insert into t3 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+insert into t1 select RAND()*1000, A.a + 10*(B.a+10*(C.a+10*D.a))
+from t3 A, t3 B, t3 C, t3 D where D.a<3;
+insert into t2(y,z) select t1.b, RAND()*1000 from t1, t3;
+SET SESSION sort_buffer_size = 32 * 1024;
+SELECT SQL_NO_CACHE COUNT(*)
+FROM (SELECT  a, b, (SELECT x FROM t2 WHERE y=b ORDER BY z DESC LIMIT 1) c
+FROM t1) t;
+COUNT(*)
+3000
+SET SESSION sort_buffer_size = 8 * 1024 * 1024;
+SELECT SQL_NO_CACHE COUNT(*)
+FROM (SELECT  a, b, (SELECT x FROM t2 WHERE y=b ORDER BY z DESC LIMIT 1) c
+FROM t1) t;
+COUNT(*)
+3000
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (id char(4) PRIMARY KEY, c int);
+CREATE TABLE t2 (c int);
+INSERT INTO t1 VALUES ('aa', 1);
+INSERT INTO t2 VALUES (1);
+SELECT * FROM t1
+WHERE EXISTS (SELECT c FROM t2 WHERE c=1
+UNION
+SELECT c from t2 WHERE c=t1.c);
+id	c
+aa	1
+INSERT INTO t1 VALUES ('bb', 2), ('cc', 3), ('dd',1);
+SELECT * FROM t1
+WHERE EXISTS (SELECT c FROM t2 WHERE c=1
+UNION
+SELECT c from t2 WHERE c=t1.c);
+id	c
+aa	1
+bb	2
+cc	3
+dd	1
+INSERT INTO t2 VALUES (2);
+CREATE TABLE t3 (c int);
+INSERT INTO t3 VALUES (1);
+SELECT * FROM t1
+WHERE EXISTS (SELECT t2.c FROM t2 JOIN t3 ON t2.c=t3.c WHERE t2.c=1
+UNION
+SELECT c from t2 WHERE c=t1.c);
+id	c
+aa	1
+bb	2
+cc	3
+dd	1
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1(f1 int);
+CREATE TABLE t2(f2 int, f21 int, f3 timestamp);
+INSERT INTO t1 VALUES (1),(1),(2),(2);
+INSERT INTO t2 VALUES (1,1,"2004-02-29 11:11:11"), (2,2,"2004-02-29 11:11:11");
+SELECT ((SELECT f2 FROM t2 WHERE f21=f1 LIMIT 1) * COUNT(f1)) AS sq FROM t1 GROUP BY f1;
+sq
+2
+4
+SELECT (SELECT SUM(1) FROM t2 ttt GROUP BY t2.f3 LIMIT 1) AS tt FROM t2;
+tt
+2
+2
+PREPARE stmt1 FROM 'SELECT ((SELECT f2 FROM t2 WHERE f21=f1 LIMIT 1) * COUNT(f1)) AS sq FROM t1 GROUP BY f1';
+EXECUTE stmt1;
+sq
+2
+4
+EXECUTE stmt1;
+sq
+2
+4
+DEALLOCATE PREPARE stmt1;
+SELECT f2, AVG(f21),
+(SELECT t.f3 FROM t2 AS t WHERE t2.f2=t.f2 AND t.f3=MAX(t2.f3)) AS test
+FROM t2 GROUP BY f2;
+f2	AVG(f21)	test
+1	1.0000	2004-02-29 11:11:11
+2	2.0000	2004-02-29 11:11:11
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a int, b INT, c CHAR(10) NOT NULL);
+INSERT INTO t1 VALUES
+(1,1,'a'), (1,2,'b'), (1,3,'c'), (1,4,'d'), (1,5,'e'),
+(2,1,'f'), (2,2,'g'), (2,3,'h'), (3,4,'i'), (3,3,'j'),
+(3,2,'k'), (3,1,'l'), (1,9,'m');
+SELECT a, MAX(b),
+(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b)) AS test
+FROM t1 GROUP BY a;
+a	MAX(b)	test
+1	9	m
+2	3	h
+3	4	i
+DROP TABLE t1;
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+DROP TABLE IF EXISTS t1xt2;
+CREATE TABLE t1 (
+id_1 int(5) NOT NULL,
+t varchar(4) DEFAULT NULL
+);
+CREATE TABLE t2 (
+id_2 int(5) NOT NULL,
+t varchar(4) DEFAULT NULL
+);
+CREATE TABLE t1xt2 (
+id_1 int(5) NOT NULL,
+id_2 int(5) NOT NULL
+);
+INSERT INTO t1 VALUES (1, 'a'), (2, 'b'), (3, 'c'), (4, 'd');
+INSERT INTO t2 VALUES (2, 'bb'), (3, 'cc'), (4, 'dd'), (12, 'aa');
+INSERT INTO t1xt2 VALUES (2, 2), (3, 3), (4, 4);
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1));
+id_1
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 IN ((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)));
+id_1
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 IN (((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1))));
+id_1
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 NOT IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1));
+id_1
+1
+2
+3
+4
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 NOT IN ((SELECT t1xt2.id_2 FROM t1xt2 where t1.id_1 = t1xt2.id_1)));
+id_1
+1
+2
+3
+4
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 NOT IN (((SELECT t1xt2.id_2 FROM t1xt2 where t1.id_1 = t1xt2.id_1))));
+id_1
+1
+2
+3
+4
+insert INTO t1xt2 VALUES (1, 12);
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1));
+id_1
+1
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 IN ((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)));
+id_1
+1
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 IN (((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1))));
+id_1
+1
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 NOT IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1));
+id_1
+2
+3
+4
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 NOT IN ((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)));
+id_1
+2
+3
+4
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 NOT IN (((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1))));
+id_1
+2
+3
+4
+insert INTO t1xt2 VALUES (2, 12);
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1));
+id_1
+1
+2
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 IN ((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)));
+id_1
+1
+2
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 IN (((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1))));
+id_1
+1
+2
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 NOT IN (SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1));
+id_1
+3
+4
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 NOT IN ((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1)));
+id_1
+3
+4
+SELECT DISTINCT t1.id_1 FROM t1 WHERE
+(12 NOT IN (((SELECT t1xt2.id_2 FROM t1xt2 WHERE t1.id_1 = t1xt2.id_1))));
+id_1
+3
+4
+DROP TABLE t1;
+DROP TABLE t2;
+DROP TABLE t1xt2;
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (3), (1), (2);
+SELECT 'this is ' 'a test.' AS col1, a AS col2 FROM t1;
+col1	col2
+this is a test.	3
+this is a test.	1
+this is a test.	2
+SELECT * FROM (SELECT 'this is ' 'a test.' AS col1, a AS t2 FROM t1) t;
+col1	t2
+this is a test.	3
+this is a test.	1
+this is a test.	2
+DROP table t1;
+CREATE TABLE t1 (a int, b int);
+CREATE TABLE t2 (m int, n int);
+INSERT INTO t1 VALUES (2,2), (2,2), (3,3), (3,3), (3,3), (4,4);
+INSERT INTO t2 VALUES (1,11), (2,22), (3,32), (4,44), (4,44);
+SELECT COUNT(*), a,
+(SELECT m FROM t2 WHERE m = count(*) LIMIT 1)
+FROM t1 GROUP BY a;
+COUNT(*)	a	(SELECT m FROM t2 WHERE m = count(*) LIMIT 1)
+2	2	2
+3	3	3
+1	4	1
+SELECT COUNT(*), a,
+(SELECT MIN(m) FROM t2 WHERE m = count(*))
+FROM t1 GROUP BY a;
+COUNT(*)	a	(SELECT MIN(m) FROM t2 WHERE m = count(*))
+2	2	2
+3	3	3
+1	4	1
+SELECT COUNT(*), a
+FROM t1 GROUP BY a
+HAVING (SELECT MIN(m) FROM t2 WHERE m = count(*)) > 1;
+COUNT(*)	a
+2	2
+3	3
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a int, b int);
+CREATE TABLE t2 (m int, n int);
+INSERT INTO t1 VALUES (2,2), (2,2), (3,3), (3,3), (3,3), (4,4);
+INSERT INTO t2 VALUES (1,11), (2,22), (3,32), (4,44), (4,44);
+SELECT COUNT(*) c, a,
+(SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a)
+FROM t1 GROUP BY a;
+c	a	(SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a)
+2	2	2
+3	3	3
+1	4	1,1
+SELECT COUNT(*) c, a,
+(SELECT GROUP_CONCAT(COUNT(a)+1) FROM t2 WHERE m = a)
+FROM t1 GROUP BY a;
+c	a	(SELECT GROUP_CONCAT(COUNT(a)+1) FROM t2 WHERE m = a)
+2	2	3
+3	3	4
+1	4	2,2
+DROP table t1,t2;
+CREATE TABLE t1 (a int, b INT, d INT, c CHAR(10) NOT NULL, PRIMARY KEY (a, b));
+INSERT INTO t1 VALUES (1,1,0,'a'), (1,2,0,'b'), (1,3,0,'c'), (1,4,0,'d'),
+(1,5,0,'e'), (2,1,0,'f'), (2,2,0,'g'), (2,3,0,'h'), (3,4,0,'i'), (3,3,0,'j'),
+(3,2,0,'k'), (3,1,0,'l'), (1,9,0,'m'), (1,0,10,'n'), (2,0,5,'o'), (3,0,7,'p');
+SELECT a, MAX(b),
+(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b + 0)) as test
+FROM t1 GROUP BY a;
+a	MAX(b)	test
+1	9	m
+2	3	h
+3	4	i
+SELECT a x, MAX(b),
+(SELECT t.c FROM t1 AS t WHERE x=t.a AND t.b=MAX(t1.b + 0)) as test
+FROM t1 GROUP BY a;
+x	MAX(b)	test
+1	9	m
+2	3	h
+3	4	i
+SELECT a, AVG(b),
+(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=AVG(t1.b)) AS test
+FROM t1 WHERE t1.d=0 GROUP BY a;
+a	AVG(b)	test
+1	4.0000	d
+2	2.0000	g
+3	2.5000	NULL
+SELECT tt.a,
+(SELECT (SELECT c FROM t1 as t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a)
+LIMIT 1) FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1) as test
+FROM t1 as tt;
+a	test
+1	n
+1	n
+1	n
+1	n
+1	n
+1	n
+1	n
+2	o
+2	o
+2	o
+2	o
+3	p
+3	p
+3	p
+3	p
+3	p
+SELECT tt.a,
+(SELECT (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a)
+LIMIT 1)
+FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1) as test
+FROM t1 as tt GROUP BY tt.a;
+a	test
+1	n
+2	o
+3	p
+SELECT tt.a, MAX(
+(SELECT (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a)
+LIMIT 1)
+FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1)) as test
+FROM t1 as tt GROUP BY tt.a;
+a	test
+1	n
+2	o
+3	p
+DROP TABLE t1;
+CREATE TABLE t1 (a int, b int);
+INSERT INTO t1 VALUES (2,22),(1,11),(2,22);
+SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 0 GROUP BY a;
+a
+1
+2
+SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 1 GROUP BY a;
+a
+SELECT a FROM t1 t0
+WHERE (SELECT COUNT(t0.b) FROM t1 t WHERE t.b>20) GROUP BY a;
+a
+1
+2
+SET @@sql_mode='ansi';
+SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 0 GROUP BY a;
+ERROR HY000: Invalid use of group function
+SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 1 GROUP BY a;
+ERROR HY000: Invalid use of group function
+SELECT a FROM t1 t0
+WHERE (SELECT COUNT(t0.b) FROM t1 t WHERE t.b>20) GROUP BY a;
+ERROR HY000: Invalid use of group function
+SET @@sql_mode=default;
+DROP TABLE t1;
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 values (1),(1),(1),(1);
+CREATE TABLE t2 (x INT);
+INSERT INTO t1 values (1000),(1001),(1002);
+SELECT SUM( (SELECT COUNT(a) FROM t2) ) FROM t1;
+ERROR HY000: Invalid use of group function
+SELECT SUM( (SELECT SUM(COUNT(a)) FROM t2) ) FROM t1;
+ERROR HY000: Invalid use of group function
+SELECT COUNT(1) FROM DUAL;
+COUNT(1)
+1
+SELECT SUM( (SELECT AVG( (SELECT t1.a FROM t2) ) FROM DUAL) ) FROM t1;
+ERROR HY000: Invalid use of group function
+SELECT
+SUM( (SELECT AVG( (SELECT COUNT(*) FROM t1 t HAVING t1.a < 12) ) FROM t2) )
+FROM t1;
+ERROR HY000: Invalid use of group function
+SELECT t1.a as XXA,
+SUM( (SELECT AVG( (SELECT COUNT(*) FROM t1 t HAVING XXA < 12) ) FROM t2) )
+FROM t1;
+ERROR HY000: Invalid use of group function
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a int, b int, KEY (a));
+INSERT INTO t1 VALUES (1,1),(2,1);
+EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT COUNT(*) FROM t1 GROUP BY b);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ref	a	a	5	const	1	Using where; Using index
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	Using temporary; Using filesort
+DROP TABLE t1;
+CREATE TABLE t1 (id int NOT NULL, st CHAR(2), INDEX idx(id));
+INSERT INTO t1 VALUES
+(3,'FL'), (2,'GA'), (4,'FL'), (1,'GA'), (5,'NY'), (7,'FL'), (6,'NY');
+CREATE TABLE t2 (id int NOT NULL, INDEX idx(id));
+INSERT INTO t2 VALUES (7), (5), (1), (3);
+SELECT id, st FROM t1
+WHERE st IN ('GA','FL') AND EXISTS(SELECT 1 FROM t2 WHERE t2.id=t1.id);
+id	st
+3	FL
+1	GA
+7	FL
+SELECT id, st FROM t1
+WHERE st IN ('GA','FL') AND EXISTS(SELECT 1 FROM t2 WHERE t2.id=t1.id)
+GROUP BY id;
+id	st
+1	GA
+3	FL
+7	FL
+SELECT id, st FROM t1
+WHERE st IN ('GA','FL') AND NOT EXISTS(SELECT 1 FROM t2 WHERE t2.id=t1.id);
+id	st
+2	GA
+4	FL
+SELECT id, st FROM t1
+WHERE st IN ('GA','FL') AND NOT EXISTS(SELECT 1 FROM t2 WHERE t2.id=t1.id)
+GROUP BY id;
+id	st
+2	GA
+4	FL
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (1), (2);
+EXPLAIN EXTENDED
+SELECT * FROM (SELECT count(*) FROM t1 GROUP BY a) as res;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
+Warnings:
+Note	1003	select `res`.`count(*)` AS `count(*)` from (select count(0) AS `count(*)` from `test`.`t1` group by `test`.`t1`.`a`) `res`
+DROP TABLE t1;
+CREATE TABLE t1 (
+a varchar(255) default NULL,
+b timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
+INDEX idx(a,b)
+);
+CREATE TABLE t2 (
+a varchar(255) default NULL
+);
+INSERT INTO t1 VALUES ('abcdefghijk','2007-05-07 06:00:24');
+INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO `t1` VALUES ('asdf','2007-02-08 01:11:26');
+INSERT INTO `t2` VALUES ('abcdefghijk');
+INSERT INTO `t2` VALUES ('asdf');
+SET session sort_buffer_size=8192;
+SELECT (SELECT 1 FROM  t1 WHERE t1.a=t2.a ORDER BY t1.b LIMIT 1) AS d1 FROM t2;
+d1
+1
+1
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a INTEGER, b INTEGER);
+CREATE TABLE t2 (x INTEGER);
+INSERT INTO t1 VALUES (1,11), (2,22), (2,22);
+INSERT INTO t2 VALUES (1), (2);
+SELECT a, COUNT(b), (SELECT COUNT(b) FROM t2) FROM t1 GROUP BY a;
+ERROR 21000: Subquery returns more than 1 row
+SELECT a, COUNT(b), (SELECT COUNT(b)+0 FROM t2) FROM t1 GROUP BY a;
+ERROR 21000: Subquery returns more than 1 row
+SELECT (SELECT SUM(t1.a)/AVG(t2.x) FROM t2) FROM t1;
+(SELECT SUM(t1.a)/AVG(t2.x) FROM t2)
+3.3333
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a INT, b INT);
+INSERT INTO t1 VALUES (1, 2), (1,3), (1,4), (2,1), (2,2);
+SELECT a1.a, COUNT(*) FROM t1 a1 WHERE a1.a = 1
+AND EXISTS( SELECT a2.a FROM t1 a2 WHERE a2.a = a1.a)
+GROUP BY a1.a;
+a	COUNT(*)
+1	3
+DROP TABLE t1;
+CREATE TABLE t1 (a INT);
+CREATE TABLE t2 (a INT);
+INSERT INTO t1 VALUES (1),(2);
+INSERT INTO t2 VALUES (1),(2);
+SELECT (SELECT SUM(t1.a) FROM t2 WHERE a=0) FROM t1;
+(SELECT SUM(t1.a) FROM t2 WHERE a=0)
+NULL
+SELECT (SELECT SUM(t1.a) FROM t2 WHERE a!=0) FROM t1;
+ERROR 21000: Subquery returns more than 1 row
+SELECT (SELECT SUM(t1.a) FROM t2 WHERE a=1) FROM t1;
+(SELECT SUM(t1.a) FROM t2 WHERE a=1)
+3
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a1 INT, a2 INT);
+CREATE TABLE t2 (b1 INT, b2 INT);
+INSERT INTO t1 VALUES (100, 200);
+INSERT INTO t1 VALUES (101, 201);
+INSERT INTO t2 VALUES (101, 201);
+INSERT INTO t2 VALUES (103, 203);
+SELECT ((a1,a2) IN (SELECT * FROM t2 WHERE b2 > 0)) IS NULL FROM t1;
+((a1,a2) IN (SELECT * FROM t2 WHERE b2 > 0)) IS NULL
+0
+0
+DROP TABLE t1, t2;
+CREATE TABLE t1 (s1 BINARY(5), s2 VARBINARY(5));
+INSERT INTO t1 VALUES (0x41,0x41), (0x42,0x42), (0x43,0x43);
+SELECT s1, s2 FROM t1 WHERE s2 IN (SELECT s1 FROM t1);
+s1	s2
+SELECT s1, s2 FROM t1 WHERE (s2, 10) IN (SELECT s1, 10 FROM t1);
+s1	s2
+CREATE INDEX I1 ON t1 (s1);
+CREATE INDEX I2 ON t1 (s2);
+SELECT s1, s2 FROM t1 WHERE s2 IN (SELECT s1 FROM t1);
+s1	s2
+SELECT s1, s2 FROM t1 WHERE (s2, 10) IN (SELECT s1, 10 FROM t1);
+s1	s2
+TRUNCATE t1;
+INSERT INTO t1 VALUES (0x41,0x41);
+SELECT * FROM t1 WHERE s1 = (SELECT s2 FROM t1);
+s1	s2
+DROP TABLE t1;
+CREATE TABLE t1 (a1 VARBINARY(2) NOT NULL DEFAULT '0', PRIMARY KEY (a1));
+CREATE TABLE t2 (a2 BINARY(2) default '0', INDEX (a2));
+CREATE TABLE t3 (a3 BINARY(2) default '0');
+INSERT INTO t1 VALUES (1),(2),(3),(4);
+INSERT INTO t2 VALUES (1),(2),(3);
+INSERT INTO t3 VALUES (1),(2),(3);
+SELECT LEFT(t2.a2, 1) FROM t2,t3 WHERE t3.a3=t2.a2;
+LEFT(t2.a2, 1)
+1
+2
+3
+SELECT t1.a1, t1.a1 in (SELECT t2.a2 FROM t2,t3 WHERE t3.a3=t2.a2) FROM t1;
+a1	t1.a1 in (SELECT t2.a2 FROM t2,t3 WHERE t3.a3=t2.a2)
+1	0
+2	0
+3	0
+4	0
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (a1 BINARY(3) PRIMARY KEY, b1 VARBINARY(3));
+CREATE TABLE t2 (a2 VARBINARY(3) PRIMARY KEY);
+CREATE TABLE t3 (a3 VARBINARY(3) PRIMARY KEY);
+INSERT INTO t1 VALUES (1,10), (2,20), (3,30), (4,40);
+INSERT INTO t2 VALUES (2), (3), (4), (5);
+INSERT INTO t3 VALUES (10), (20), (30);
+SELECT LEFT(t1.a1,1) FROM t1,t3 WHERE t1.b1=t3.a3;
+LEFT(t1.a1,1)
+1
+2
+3
+SELECT a2 FROM t2 WHERE t2.a2 IN (SELECT t1.a1 FROM t1,t3 WHERE t1.b1=t3.a3);
+a2
+DROP TABLE t1, t2, t3;
+SET @save_optimizer_switch=@@optimizer_switch;
+SET optimizer_switch='semijoin_with_cache=off';
+SET optimizer_switch='materialization=off';
+CREATE TABLE t1 (a CHAR(1), b VARCHAR(10));
+INSERT INTO t1 VALUES ('a', 'aa');
+INSERT INTO t1 VALUES ('a', 'aaa');
+SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1);
+a	b
+CREATE INDEX I1 ON t1 (a);
+CREATE INDEX I2 ON t1 (b);
+EXPLAIN SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	I2	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t1	ref	I1	I1	2	test.t1.b	2	Using where; Using index; FirstMatch(t1)
+SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1);
+a	b
+CREATE TABLE t2 (a VARCHAR(1), b VARCHAR(10));
+INSERT INTO t2 SELECT * FROM t1;
+CREATE INDEX I1 ON t2 (a);
+CREATE INDEX I2 ON t2 (b);
+EXPLAIN SELECT a,b FROM t2 WHERE b IN (SELECT a FROM t2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	ALL	I2	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t2	ref	I1	I1	4	test.t2.b	2	Using where; Using index; FirstMatch(t2)
+SELECT a,b FROM t2 WHERE b IN (SELECT a FROM t2);
+a	b
+EXPLAIN
+SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1 WHERE LENGTH(a)<500);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	I2	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t1	ref	I1	I1	2	test.t1.b	2	Using where; Using index; FirstMatch(t1)
+SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1 WHERE LENGTH(a)<500);
+a	b
+DROP TABLE t1,t2;
+SET optimizer_switch= @save_optimizer_switch;
+CREATE TABLE t1(a INT, b INT);
+INSERT INTO t1 VALUES (1,1), (1,2), (2,3), (2,4);
+EXPLAIN
+SELECT a AS out_a, MIN(b) FROM t1
+WHERE b > (SELECT MIN(b) FROM t1 WHERE a = out_a)
+GROUP BY a;
+ERROR 42S22: Unknown column 'out_a' in 'where clause'
+SELECT a AS out_a, MIN(b) FROM t1
+WHERE b > (SELECT MIN(b) FROM t1 WHERE a = out_a)
+GROUP BY a;
+ERROR 42S22: Unknown column 'out_a' in 'where clause'
+EXPLAIN
+SELECT a AS out_a, MIN(b) FROM t1 t1_outer
+WHERE b > (SELECT MIN(b) FROM t1 WHERE a = t1_outer.a)
+GROUP BY a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1_outer	ALL	NULL	NULL	NULL	NULL	4	Using where; Using temporary; Using filesort
+2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
+SELECT a AS out_a, MIN(b) FROM t1 t1_outer
+WHERE b > (SELECT MIN(b) FROM t1 WHERE a = t1_outer.a)
+GROUP BY a;
+out_a	MIN(b)
+1	2
+2	4
+DROP TABLE t1;
+CREATE TABLE t1 (a INT);
+CREATE TABLE t2 (a INT);
+INSERT INTO t1 VALUES (1),(2);
+INSERT INTO t2 VALUES (1),(2);
+SELECT 2 FROM t1 WHERE EXISTS ((SELECT 1 FROM t2 WHERE t1.a=t2.a));
+2
+2
+2
+EXPLAIN EXTENDED
+SELECT 2 FROM t1 WHERE EXISTS ((SELECT 1 FROM t2 WHERE t1.a=t2.a));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	100.00	
+2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1003	select 2 AS `2` from `test`.`t1` semi join (`test`.`t2`) where 1
+EXPLAIN EXTENDED
+SELECT 2 FROM t1 WHERE EXISTS ((SELECT 1 FROM t2 WHERE t1.a=t2.a) UNION
+(SELECT 1 FROM t2 WHERE t1.a = t2.a));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+3	DEPENDENT UNION	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
+Warnings:
+Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
+Note	1276	Field or reference 'test.t1.a' of SELECT #3 was resolved in SELECT #1
+Note	1003	select 2 AS `2` from `test`.`t1` where <expr_cache><`test`.`t1`.`a`>(exists((select 1 from `test`.`t2` where (`test`.`t1`.`a` = `test`.`t2`.`a`)) union (select 1 from `test`.`t2` where (`test`.`t1`.`a` = `test`.`t2`.`a`))))
+DROP TABLE t1,t2;
+create table t0(a int);
+insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+create table t1(f11 int, f12 int);
+create table t2(f21 int unsigned not null, f22 int, f23 varchar(10));
+insert into t1 values(1,1),(2,2), (3, 3);
+insert into t2
+select -1 , (@a:=(A.a + 10 * (B.a + 10 * (C.a+10*D.a))))/5000 + 1, @a
+from t0 A, t0 B, t0 C, t0 D;
+set session sort_buffer_size= 33*1024;
+select count(*) from t1 where f12 =
+(select f22 from t2 where f22 = f12 order by f21 desc, f22, f23 limit 1);
+count(*)
+3
+drop table t0,t1,t2;
+CREATE TABLE t4 (
+f7 varchar(32) collate utf8_bin NOT NULL default '',
+f10 varchar(32) collate utf8_bin default NULL,
+PRIMARY KEY  (f7)
+);
+INSERT INTO t4 VALUES(1,1), (2,null);
+CREATE TABLE t2 (
+f4 varchar(32) collate utf8_bin NOT NULL default '',
+f2 varchar(50) collate utf8_bin default NULL,
+f3 varchar(10) collate utf8_bin default NULL,
+PRIMARY KEY  (f4),
+UNIQUE KEY uk1 (f2)
+);
+INSERT INTO t2 VALUES(1,1,null), (2,2,null);
+CREATE TABLE t1 (
+f8 varchar(32) collate utf8_bin NOT NULL default '',
+f1 varchar(10) collate utf8_bin default NULL,
+f9 varchar(32) collate utf8_bin default NULL,
+PRIMARY KEY  (f8)
+);
+INSERT INTO t1 VALUES (1,'P',1), (2,'P',1), (3,'R',2);
+CREATE TABLE t3 (
+f6 varchar(32) collate utf8_bin NOT NULL default '',
+f5 varchar(50) collate utf8_bin default NULL,
+PRIMARY KEY (f6)
+);
+INSERT INTO t3 VALUES (1,null), (2,null);
+SELECT
+IF(t1.f1 = 'R', a1.f2, t2.f2) AS a4,
+IF(t1.f1 = 'R', a1.f3, t2.f3) AS f3,
+SUM(
+IF(
+(SELECT VPC.f2
+FROM t2 VPC, t4 a2, t2 a3
+WHERE
+VPC.f4 = a2.f10 AND a3.f2 = a4
+LIMIT 1) IS NULL,
+0,
+t3.f5
+)
+) AS a6
+FROM
+t2, t3, t1 JOIN t2 a1 ON t1.f9 = a1.f4
+GROUP BY a4;
+a4	f3	a6
+1	NULL	NULL
+2	NULL	NULL
+DROP TABLE t1, t2, t3, t4;
+create table t1 (a float(5,4) zerofill);
+create table t2 (a float(5,4),b float(2,0));
+select t1.a from t1 where
+t1.a= (select b from t2 limit 1) and not
+t1.a= (select a from t2 limit 1) ;
+a
+drop table t1, t2;
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1),(2);
+SET @save_join_cache_level=@@join_cache_level;
+SET join_cache_level=0;
+EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT min(a) FROM t1 GROUP BY a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<subquery2>	const	distinct_key	distinct_key	4	const	1	100.00	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+2	MATERIALIZED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary
+Warnings:
+Note	1003	select 1 AS `1` from  <materialize> (select min(`test`.`t1`.`a`) from `test`.`t1` group by `test`.`t1`.`a`) join `test`.`t1` where (`<subquery2>`.`min(a)` = 1)
+EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT min(a) FROM t1 WHERE a > 3 GROUP BY a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<subquery2>	const	distinct_key	distinct_key	4	const	1	100.00	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+2	MATERIALIZED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using temporary
+Warnings:
+Note	1003	select 1 AS `1` from  <materialize> (select min(`test`.`t1`.`a`) from `test`.`t1` where (`test`.`t1`.`a` > 3) group by `test`.`t1`.`a`) join `test`.`t1` where (`<subquery2>`.`min(a)` = 1)
+SET join_cache_level=@save_join_cache_level;
+DROP TABLE t1;
+#
+# Bug#45061: Incorrectly market field caused wrong result.
+#
+CREATE TABLE `C` (
+`int_nokey` int(11) NOT NULL,
+`int_key` int(11) NOT NULL,
+KEY `int_key` (`int_key`)
+);
+INSERT INTO `C` VALUES (9,9), (0,0), (8,6), (3,6), (7,6), (0,4),
+(1,7), (9,4), (0,8), (9,4), (0,7), (5,5), (0,0), (8,5), (8,7),
+(5,2), (1,8), (7,0), (0,9), (9,5);
+SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`);
+int_nokey	int_key
+9	9
+0	0
+5	5
+0	0
+EXPLAIN EXTENDED SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	C	ALL	NULL	NULL	NULL	NULL	20	100.00	Using where
+DROP TABLE C;
+# End of test for bug#45061.
+#
+# Bug #46749: Segfault in add_key_fields() with outer subquery level 
+#   field references
+#
+CREATE TABLE t1 (
+a int,
+b int,
+UNIQUE (a), KEY (b)
+);
+INSERT INTO t1 VALUES (1,1), (2,1);
+CREATE TABLE st1 like t1;
+INSERT INTO st1 VALUES (1,1), (2,1);
+CREATE TABLE st2 like t1;
+INSERT INTO st2 VALUES (1,1), (2,1);
+EXPLAIN
+SELECT MAX(b), (SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b)
+FROM t1 
+WHERE a = 230;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+SELECT MAX(b), (SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b)
+FROM t1 
+WHERE a = 230;
+MAX(b)	(SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b)
+NULL	NULL
+DROP TABLE t1, st1, st2;
+#
+# Bug #48709: Assertion failed in sql_select.cc:11782: 
+#   int join_read_key(JOIN_TAB*)
+#
+CREATE TABLE t1 (pk int PRIMARY KEY, int_key int);
+INSERT INTO t1 VALUES (10,1), (14,1);
+CREATE TABLE t2 (pk int PRIMARY KEY, int_key int);
+INSERT INTO t2 VALUES (3,3), (5,NULL), (7,3);
+# should have eq_ref for t1
+EXPLAIN
+SELECT * FROM t2 outr
+WHERE outr.int_key NOT IN (SELECT t1.pk FROM t1, t2)  
+ORDER BY outr.pk;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+x	x	outr	ALL	x	x	x	x	x	x
+x	x	t1	eq_ref	x	x	x	x	x	x
+x	x	t2	index	x	x	x	x	x	x
+# should not crash on debug binaries
+SELECT * FROM t2 outr
+WHERE outr.int_key NOT IN (SELECT t1.pk FROM t1, t2)  
+ORDER BY outr.pk;
+pk	int_key
+3	3
+7	3
+DROP TABLE t1,t2;
+#
+# Bug#12329653 
+# EXPLAIN, UNION, PREPARED STATEMENT, CRASH, SQL_FULL_GROUP_BY
+#
+CREATE TABLE t1(a1 int);
+INSERT INTO t1 VALUES (1),(2);
+SELECT @@session.sql_mode INTO @old_sql_mode;
+SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
+EXPLAIN EXTENDED
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+Warnings:
+Note	1003	select 1 AS `1` from `test`.`t1` where 1
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t1);
+1
+1
+1
+PREPARE stmt FROM 
+'SELECT 1 UNION ALL 
+SELECT 1 FROM t1
+ORDER BY
+(SELECT 1 FROM t1 AS t1_0  
+  WHERE 1 < SOME (SELECT a1 FROM t1)
+)' ;
+EXECUTE stmt ;
+ERROR 21000: Subquery returns more than 1 row
+EXECUTE stmt ;
+ERROR 21000: Subquery returns more than 1 row
+SET SESSION sql_mode=@old_sql_mode;
+DEALLOCATE PREPARE stmt;
+DROP TABLE t1;
+#
+# Bug#12763207 - ASSERT IN SUBSELECT::SINGLE_VALUE_TRANSFORMER
+#
+CREATE TABLE t1(a1 int);
+INSERT INTO t1 VALUES (1),(2);
+CREATE TABLE t2(a1 int);
+INSERT INTO t2 VALUES (3);
+SELECT @@session.sql_mode INTO @old_sql_mode;
+SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT 2 FROM t2);
+1
+1
+1
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT 2.0 FROM t2);
+1
+1
+1
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT 'a' FROM t2);
+1
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t2);
+1
+1
+1
+SET SESSION sql_mode=@old_sql_mode;
+DROP TABLE t1, t2;
+#
+# Bug#12763207 - ASSERT IN SUBSELECT::SINGLE_VALUE_TRANSFORMER
+#
+create table t2(i int);
+insert into t2 values(0);
+SELECT @@session.sql_mode INTO @old_sql_mode;
+SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
+CREATE VIEW v1 AS  
+SELECT 'f' FROM t2 UNION SELECT 'x' FROM t2
+;
+CREATE TABLE t1 (
+pk int NOT NULL,
+col_varchar_key varchar(1) DEFAULT NULL,
+PRIMARY KEY (pk),
+KEY col_varchar_key (col_varchar_key)
+);
+SELECT t1.pk
+FROM t1
+WHERE t1.col_varchar_key < ALL ( SELECT * FROM v1 )
+;
+pk
+SET SESSION sql_mode=@old_sql_mode;
+drop table t2, t1;
+drop view v1;
+End of 5.0 tests.
+create table t_out (subcase char(3),
+a1 char(2), b1 char(2), c1 char(2));
+create table t_in  (a2 char(2), b2 char(2), c2 char(2));
+insert into t_out values ('A.1','2a', NULL, '2a');
+insert into t_out values ('A.3', '2a', NULL, '2a');
+insert into t_out values ('A.4', '2a', NULL, 'xx');
+insert into t_out values ('B.1', '2a', '2a', '2a');
+insert into t_out values ('B.2', '2a', '2a', '2a');
+insert into t_out values ('B.3', '3a', 'xx', '3a');
+insert into t_out values ('B.4', 'xx', '3a', '3a');
+insert into t_in values ('1a', '1a', '1a');
+insert into t_in values ('2a', '2a', '2a');
+insert into t_in values (NULL, '2a', '2a');
+insert into t_in values ('3a', NULL, '3a');
+
+Test general IN semantics (not top-level)
+
+case A.1
+select subcase,
+(a1, b1, c1)     IN (select * from t_in where a2 = 'no_match') pred_in,
+(a1, b1, c1) NOT IN (select * from t_in where a2 = 'no_match') pred_not_in
+from t_out where subcase = 'A.1';
+subcase	pred_in	pred_not_in
+A.1	0	1
+case A.2 - impossible
+case A.3
+select subcase,
+(a1, b1, c1)     IN (select * from t_in) pred_in,
+(a1, b1, c1) NOT IN (select * from t_in) pred_not_in
+from t_out where subcase = 'A.3';
+subcase	pred_in	pred_not_in
+A.3	NULL	NULL
+case A.4
+select subcase,
+(a1, b1, c1)     IN (select * from t_in) pred_in,
+(a1, b1, c1) NOT IN (select * from t_in) pred_not_in
+from t_out where subcase = 'A.4';
+subcase	pred_in	pred_not_in
+A.4	0	1
+case B.1
+select subcase,
+(a1, b1, c1)     IN (select * from t_in where a2 = 'no_match') pred_in,
+(a1, b1, c1) NOT IN (select * from t_in where a2 = 'no_match') pred_not_in
+from t_out where subcase = 'B.1';
+subcase	pred_in	pred_not_in
+B.1	0	1
+case B.2
+select subcase,
+(a1, b1, c1)     IN (select * from t_in) pred_in,
+(a1, b1, c1) NOT IN (select * from t_in) pred_not_in
+from t_out where subcase = 'B.2';
+subcase	pred_in	pred_not_in
+B.2	1	0
+case B.3
+select subcase,
+(a1, b1, c1)     IN (select * from t_in) pred_in,
+(a1, b1, c1) NOT IN (select * from t_in) pred_not_in
+from t_out where subcase = 'B.3';
+subcase	pred_in	pred_not_in
+B.3	NULL	NULL
+case B.4
+select subcase,
+(a1, b1, c1)     IN (select * from t_in) pred_in,
+(a1, b1, c1) NOT IN (select * from t_in) pred_not_in
+from t_out where subcase = 'B.4';
+subcase	pred_in	pred_not_in
+B.4	0	1
+
+Test IN as top-level predicate, and
+as non-top level for cases A.3, B.3 (the only cases with NULL result).
+
+case A.1
+select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out
+where subcase = 'A.1' and
+(a1, b1, c1) IN (select * from t_in where a1 = 'no_match');
+pred_in
+F
+select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out
+where subcase = 'A.1' and
+(a1, b1, c1) NOT IN (select * from t_in where a1 = 'no_match');
+pred_not_in
+T
+select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out
+where subcase = 'A.1' and
+NOT((a1, b1, c1) IN (select * from t_in where a1 = 'no_match'));
+not_pred_in
+T
+case A.3
+select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out
+where subcase = 'A.3' and
+(a1, b1, c1) IN (select * from t_in);
+pred_in
+F
+select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out
+where subcase = 'A.3' and
+(a1, b1, c1) NOT IN (select * from t_in);
+pred_not_in
+F
+select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out
+where subcase = 'A.3' and
+NOT((a1, b1, c1) IN (select * from t_in));
+not_pred_in
+F
+select case when count(*) > 0 then 'N' else 'wrong result' end as pred_in from t_out
+where subcase = 'A.3' and
+((a1, b1, c1) IN (select * from t_in)) is NULL and
+((a1, b1, c1) NOT IN (select * from t_in)) is NULL;
+pred_in
+N
+case A.4
+select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out
+where subcase = 'A.4' and
+(a1, b1, c1) IN (select * from t_in);
+pred_in
+F
+select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out
+where subcase = 'A.4' and
+(a1, b1, c1) NOT IN (select * from t_in);
+pred_not_in
+T
+select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out
+where subcase = 'A.4' and
+NOT((a1, b1, c1) IN (select * from t_in));
+not_pred_in
+T
+case B.1
+select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out
+where subcase = 'B.1' and
+(a1, b1, c1) IN (select * from t_in where a1 = 'no_match');
+pred_in
+F
+select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out
+where subcase = 'B.1' and
+(a1, b1, c1) NOT IN (select * from t_in where a1 = 'no_match');
+pred_not_in
+T
+select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out
+where subcase = 'B.1' and
+NOT((a1, b1, c1) IN (select * from t_in where a1 = 'no_match'));
+not_pred_in
+T
+case B.2
+select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out
+where subcase = 'B.2' and
+(a1, b1, c1) IN (select * from t_in);
+pred_in
+T
+select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out
+where subcase = 'B.2' and
+(a1, b1, c1) NOT IN (select * from t_in);
+pred_not_in
+F
+select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out
+where subcase = 'B.2' and
+NOT((a1, b1, c1) IN (select * from t_in));
+not_pred_in
+F
+case B.3
+select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out
+where subcase = 'B.3' and
+(a1, b1, c1) IN (select * from t_in);
+pred_in
+F
+select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out
+where subcase = 'B.3' and
+(a1, b1, c1) NOT IN (select * from t_in);
+pred_not_in
+F
+select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out
+where subcase = 'B.3' and
+NOT((a1, b1, c1) IN (select * from t_in));
+not_pred_in
+F
+select case when count(*) > 0 then 'N' else 'wrong result' end as pred_in from t_out
+where subcase = 'B.3' and
+((a1, b1, c1) IN (select * from t_in)) is NULL and
+((a1, b1, c1) NOT IN (select * from t_in)) is NULL;
+pred_in
+N
+case B.4
+select case when count(*) > 0 then 'T' else 'F' end as pred_in from t_out
+where subcase = 'B.4' and
+(a1, b1, c1) IN (select * from t_in);
+pred_in
+F
+select case when count(*) > 0 then 'T' else 'F' end as pred_not_in from t_out
+where subcase = 'B.4' and
+(a1, b1, c1) NOT IN (select * from t_in);
+pred_not_in
+T
+select case when count(*) > 0 then 'T' else 'F' end as not_pred_in from t_out
+where subcase = 'B.4' and
+NOT((a1, b1, c1) IN (select * from t_in));
+not_pred_in
+T
+drop table t_out;
+drop table t_in;
+CREATE TABLE t1 (a INT, b INT);
+INSERT INTO t1 VALUES (2,22),(1,11),(2,22);
+SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 0 GROUP BY a;
+a
+1
+2
+SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 1 GROUP BY a;
+a
+SELECT a FROM t1 t0
+WHERE (SELECT COUNT(t0.b) FROM t1 t WHERE t.b>20) GROUP BY a;
+a
+1
+2
+SET @@sql_mode='ansi';
+SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 0 GROUP BY a;
+ERROR HY000: Invalid use of group function
+SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 1 GROUP BY a;
+ERROR HY000: Invalid use of group function
+SELECT a FROM t1 t0
+WHERE (SELECT COUNT(t0.b) FROM t1 t WHERE t.b>20) GROUP BY a;
+ERROR HY000: Invalid use of group function
+SET @@sql_mode=default;
+DROP TABLE t1;
+CREATE TABLE t1 (s1 CHAR(1));
+INSERT INTO t1 VALUES ('a');
+SELECT * FROM t1 WHERE _utf8'a' = ANY (SELECT s1 FROM t1);
+s1
+a
+DROP TABLE t1;
+CREATE TABLE t1(c INT, KEY(c));
+CREATE TABLE t2(a INT, b INT);
+INSERT INTO t2 VALUES (1, 10), (2, NULL);
+INSERT INTO t1 VALUES (1), (3);
+SELECT * FROM t2 WHERE b NOT IN (SELECT max(t.c) FROM t1, t1 t WHERE t.c>10);
+a	b
+DROP TABLE t1,t2;
+CREATE TABLE t1(pk INT PRIMARY KEY, a INT, INDEX idx(a));
+INSERT INTO t1 VALUES (1, 10), (3, 30), (2, 20);
+CREATE TABLE t2(pk INT PRIMARY KEY, a INT, b INT, INDEX idxa(a));
+INSERT INTO t2 VALUES (2, 20, 700), (1, 10, 200), (4, 10, 100);
+SELECT * FROM t1
+WHERE EXISTS (SELECT DISTINCT a FROM t2 WHERE t1.a < t2.a ORDER BY b);
+pk	a
+1	10
+DROP TABLE t1,t2;
+CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a), KEY b (b));
+INSERT INTO t1 VALUES (1,NULL), (9,NULL);
+CREATE TABLE t2 (
+a INT,
+b INT,
+c INT,
+d INT,
+PRIMARY KEY (a),
+UNIQUE KEY b (b,c,d),
+KEY b_2 (b),
+KEY c (c),
+KEY d (d)
+);
+INSERT INTO t2 VALUES
+(43, 2, 11 ,30),
+(44, 2, 12 ,30),
+(45, 1, 1  ,10000),
+(46, 1, 2  ,10000),
+(556,1, 32 ,10000);
+CREATE TABLE t3 (
+a INT,
+b INT,
+c INT,
+PRIMARY KEY (a),
+UNIQUE KEY b (b,c),
+KEY c (c),
+KEY b_2 (b)
+);
+INSERT INTO t3 VALUES (1,1,1), (2,32,1);
+explain
+SELECT t1.a, (SELECT 1 FROM t2 WHERE t2.b=t3.c AND t2.c=t1.a ORDER BY t2.d LIMIT 1) AS incorrect FROM t1, t3 WHERE t3.b=t1.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	index	PRIMARY	PRIMARY	4	NULL	2	Using index
+1	PRIMARY	t3	ref	b,b_2	b	5	test.t1.a	1	Using index
+2	DEPENDENT SUBQUERY	t2	ref	b,b_2,c	b	10	test.t3.c,test.t1.a	1	Using where; Using index; Using filesort
+SELECT t1.a, (SELECT 1 FROM t2 WHERE t2.b=t3.c AND t2.c=t1.a ORDER BY t2.d LIMIT 1) AS incorrect FROM t1, t3 WHERE t3.b=t1.a;
+a	incorrect
+1	1
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (id int);
+CREATE TABLE t2 (id int, c int);
+INSERT INTO t1 (id) VALUES (1);
+INSERT INTO t2 (id) VALUES (1);
+INSERT INTO t1 (id) VALUES (1);
+INSERT INTO t2 (id) VALUES (1);
+CREATE VIEW v1 AS
+SELECT t2.c AS c FROM t1, t2
+WHERE t1.id=t2.id AND 1 IN (SELECT id FROM t1) WITH CHECK OPTION;
+UPDATE v1 SET c=1;
+CREATE VIEW v2 (a,b) AS
+SELECT t2.id, t2.c AS c FROM t1, t2
+WHERE t1.id=t2.id AND 1 IN (SELECT id FROM t1) WITH CHECK OPTION;
+INSERT INTO v2(a,b) VALUES (2,2);
+ERROR HY000: CHECK OPTION failed 'test.v2'
+SELECT * FROM v1;
+c
+1
+1
+1
+1
+CREATE VIEW v3 AS
+SELECT t2.c AS c FROM t2
+WHERE 1 IN (SELECT id FROM t1) WITH CHECK OPTION;
+DELETE FROM v3;
+DROP VIEW v1,v2,v3;
+DROP TABLE t1,t2;
+#
+# BUG#37822 Correlated subquery with IN and IS UNKNOWN provides wrong result
+#
+create table t1(id integer primary key, g integer, v integer, s char(1));
+create table t2(id integer primary key, g integer, v integer, s char(1));
+insert into t1 values
+(10, 10, 10,   'l'),
+(20, 20, 20,   'l'),
+(40, 40, 40,   'l'),
+(41, 40, null, 'l'),
+(50, 50, 50,   'l'),
+(51, 50, null, 'l'),
+(60, 60, 60,   'l'),
+(61, 60, null, 'l'),
+(70, 70, 70,   'l'),
+(90, 90, null, 'l');
+insert into t2 values
+(10, 10, 10,   'r'),
+(30, 30, 30,   'r'),
+(50, 50, 50,   'r'),
+(60, 60, 60,   'r'),
+(61, 60, null, 'r'),
+(70, 70, 70,   'r'),
+(71, 70, null, 'r'),
+(80, 80, 80,   'r'),
+(81, 80, null, 'r'),
+(100,100,null, 'r');
+select *
+from t1
+where v in(select v
+from t2
+where t1.g=t2.g) is unknown;
+id	g	v	s
+51	50	NULL	l
+61	60	NULL	l
+drop table t1, t2;
+#
+# Bug#37822 Correlated subquery with IN and IS UNKNOWN provides wrong result
+#
+create table t1(id integer primary key, g integer, v integer, s char(1));
+create table t2(id integer primary key, g integer, v integer, s char(1));
+insert into t1 values
+(10, 10, 10,   'l'),
+(20, 20, 20,   'l'),
+(40, 40, 40,   'l'),
+(41, 40, null, 'l'),
+(50, 50, 50,   'l'),
+(51, 50, null, 'l'),
+(60, 60, 60,   'l'),
+(61, 60, null, 'l'),
+(70, 70, 70,   'l'),
+(90, 90, null, 'l');
+insert into t2 values
+(10, 10, 10,   'r'),
+(30, 30, 30,   'r'),
+(50, 50, 50,   'r'),
+(60, 60, 60,   'r'),
+(61, 60, null, 'r'),
+(70, 70, 70,   'r'),
+(71, 70, null, 'r'),
+(80, 80, 80,   'r'),
+(81, 80, null, 'r'),
+(100,100,null, 'r');
+select *
+from t1
+where v in(select v
+from t2
+where t1.g=t2.g) is unknown;
+id	g	v	s
+51	50	NULL	l
+61	60	NULL	l
+drop table t1, t2;
+#
+# Bug#33204: INTO is allowed in subselect, causing inconsistent results
+#
+CREATE TABLE t1( a INT );
+INSERT INTO t1 VALUES (1),(2);
+CREATE TABLE t2( a INT, b INT );
+SELECT * 
+FROM (SELECT a INTO @var FROM t1 WHERE a = 2) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @var FROM t1 WHERE a = 2) t1a' at line 2
+SELECT * 
+FROM (SELECT a INTO OUTFILE 'file' FROM t1 WHERE a = 2) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO OUTFILE 'file' FROM t1 WHERE a = 2) t1a' at line 2
+SELECT * 
+FROM (SELECT a INTO DUMPFILE 'file' FROM t1 WHERE a = 2) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO DUMPFILE 'file' FROM t1 WHERE a = 2) t1a' at line 2
+SELECT * FROM ( 
+SELECT 1 a 
+UNION 
+SELECT a INTO @var FROM t1 WHERE a = 2 
+) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @var FROM t1 WHERE a = 2 
+) t1a' at line 4
+SELECT * FROM ( 
+SELECT 1 a 
+UNION 
+SELECT a INTO OUTFILE 'file' FROM t1 WHERE a = 2 
+) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO OUTFILE 'file' FROM t1 WHERE a = 2 
+) t1a' at line 4
+SELECT * FROM ( 
+SELECT 1 a 
+UNION 
+SELECT a INTO DUMPFILE 'file' FROM t1 WHERE a = 2 
+) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO DUMPFILE 'file' FROM t1 WHERE a = 2 
+) t1a' at line 4
+SELECT * FROM (SELECT a FROM t1 WHERE a = 2) t1a;
+a
+2
+SELECT * FROM ( 
+SELECT a FROM t1 WHERE a = 2 
+UNION 
+SELECT a FROM t1 WHERE a = 2 
+) t1a;
+a
+2
+SELECT * FROM ( 
+SELECT 1 a 
+UNION 
+SELECT a FROM t1 WHERE a = 2 
+UNION 
+SELECT a FROM t1 WHERE a = 2 
+) t1a;
+a
+1
+2
+SELECT * FROM ((SELECT 1 a) UNION SELECT 1 a);
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')' at line 1
+SELECT * FROM (SELECT 1 a UNION (SELECT 1 a)) alias;
+a
+1
+SELECT * FROM (SELECT 1 UNION SELECT 1) t1a;
+1
+1
+SELECT * FROM ((SELECT 1 a INTO @a)) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @a)) t1a' at line 1
+SELECT * FROM ((SELECT 1 a INTO OUTFILE 'file' )) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO OUTFILE 'file' )) t1a' at line 1
+SELECT * FROM ((SELECT 1 a INTO DUMPFILE 'file' )) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO DUMPFILE 'file' )) t1a' at line 1
+SELECT * FROM (SELECT 1 a UNION (SELECT 1 a INTO @a)) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @a)) t1a' at line 1
+SELECT * FROM (SELECT 1 a UNION (SELECT 1 a INTO DUMPFILE 'file' )) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO DUMPFILE 'file' )) t1a' at line 1
+SELECT * FROM (SELECT 1 a UNION (SELECT 1 a INTO OUTFILE 'file' )) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO OUTFILE 'file' )) t1a' at line 1
+SELECT * FROM (SELECT 1 a UNION ((SELECT 1 a INTO @a))) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @a))) t1a' at line 1
+SELECT * FROM (SELECT 1 a UNION ((SELECT 1 a INTO DUMPFILE 'file' ))) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO DUMPFILE 'file' ))) t1a' at line 1
+SELECT * FROM (SELECT 1 a UNION ((SELECT 1 a INTO OUTFILE 'file' ))) t1a;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO OUTFILE 'file' ))) t1a' at line 1
+SELECT * FROM (SELECT 1 a ORDER BY a) t1a;
+a
+1
+SELECT * FROM (SELECT 1 a UNION SELECT 1 a ORDER BY a) t1a;
+a
+1
+SELECT * FROM (SELECT 1 a UNION SELECT 1 a LIMIT 1) t1a;
+a
+1
+SELECT * FROM (SELECT 1 a UNION SELECT 1 a ORDER BY a LIMIT 1) t1a;
+a
+1
+SELECT * FROM t1 JOIN  (SELECT 1 UNION SELECT 1) alias ON 1;
+a	1
+1	1
+2	1
+SELECT * FROM t1 JOIN ((SELECT 1 UNION SELECT 1)) ON 1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')) ON 1' at line 1
+SELECT * FROM t1 JOIN  (t1 t1a UNION SELECT 1)  ON 1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'ON 1' at line 1
+SELECT * FROM t1 JOIN ((t1 t1a UNION SELECT 1)) ON 1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ') ON 1' at line 1
+SELECT * FROM t1 JOIN  (t1 t1a)  t1a ON 1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 't1a ON 1' at line 1
+SELECT * FROM t1 JOIN ((t1 t1a)) t1a ON 1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 't1a ON 1' at line 1
+SELECT * FROM t1 JOIN  (t1 t1a)  ON 1;
+a	a
+1	1
+2	1
+1	2
+2	2
+SELECT * FROM t1 JOIN ((t1 t1a)) ON 1;
+a	a
+1	1
+2	1
+1	2
+2	2
+SELECT * FROM (t1 t1a);
+a
+1
+2
+SELECT * FROM ((t1 t1a));
+a
+1
+2
+SELECT * FROM t1 JOIN  (SELECT 1 t1a) alias ON 1;
+a	t1a
+1	1
+2	1
+SELECT * FROM t1 JOIN ((SELECT 1 t1a)) alias ON 1;
+a	t1a
+1	1
+2	1
+SELECT * FROM t1 JOIN  (SELECT 1 a)  a ON 1;
+a	a
+1	1
+2	1
+SELECT * FROM t1 JOIN ((SELECT 1 a)) a ON 1;
+a	a
+1	1
+2	1
+SELECT * FROM (t1 JOIN (SELECT 1) t1a1 ON 1) t1a2;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 't1a2' at line 1
+SELECT * FROM t1 WHERE a = ALL ( SELECT 1 );
+a
+1
+SELECT * FROM t1 WHERE a = ALL ( SELECT 1 UNION SELECT 1 );
+a
+1
+SELECT * FROM t1 WHERE a = ANY ( SELECT 3 UNION SELECT 1 );
+a
+1
+SELECT * FROM t1 WHERE a = ANY ( SELECT 1 UNION SELECT 1 INTO @a);
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @a)' at line 1
+SELECT * FROM t1 WHERE a = ANY ( SELECT 1 UNION SELECT 1 INTO OUTFILE 'file' );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO OUTFILE 'file' )' at line 1
+SELECT * FROM t1 WHERE a = ANY ( SELECT 1 UNION SELECT 1 INTO DUMPFILE 'file' );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO DUMPFILE 'file' )' at line 1
+SELECT * FROM t1 WHERE a = ( SELECT 1 );
+a
+1
+SELECT * FROM t1 WHERE a = ( SELECT 1 UNION SELECT 1 );
+a
+1
+SELECT * FROM t1 WHERE a = ( SELECT 1 INTO @a);
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @a)' at line 1
+SELECT * FROM t1 WHERE a = ( SELECT 1 INTO OUTFILE 'file' );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO OUTFILE 'file' )' at line 1
+SELECT * FROM t1 WHERE a = ( SELECT 1 INTO DUMPFILE 'file' );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO DUMPFILE 'file' )' at line 1
+SELECT * FROM t1 WHERE a = ( SELECT 1 UNION SELECT 1 INTO @a);
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @a)' at line 1
+SELECT * FROM t1 WHERE a = ( SELECT 1 UNION SELECT 1 INTO OUTFILE 'file' );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO OUTFILE 'file' )' at line 1
+SELECT * FROM t1 WHERE a = ( SELECT 1 UNION SELECT 1 INTO DUMPFILE 'file' );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO DUMPFILE 'file' )' at line 1
+SELECT ( SELECT 1 INTO @v );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @v )' at line 1
+SELECT ( SELECT 1 INTO OUTFILE 'file' );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO OUTFILE 'file' )' at line 1
+SELECT ( SELECT 1 INTO DUMPFILE 'file' );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO DUMPFILE 'file' )' at line 1
+SELECT ( SELECT 1 UNION SELECT 1 INTO @v );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @v )' at line 1
+SELECT ( SELECT 1 UNION SELECT 1 INTO OUTFILE 'file' );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO OUTFILE 'file' )' at line 1
+SELECT ( SELECT 1 UNION SELECT 1 INTO DUMPFILE 'file' );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO DUMPFILE 'file' )' at line 1
+SELECT ( SELECT a FROM t1 WHERE a = 1 ), a FROM t1;
+( SELECT a FROM t1 WHERE a = 1 )	a
+1	1
+1	2
+SELECT ( SELECT a FROM t1 WHERE a = 1 UNION SELECT 1 ), a FROM t1;
+( SELECT a FROM t1 WHERE a = 1 UNION SELECT 1 )	a
+1	1
+1	2
+SELECT * FROM t2 WHERE (a, b) IN (SELECT a, b FROM t2);
+a	b
+SELECT 1 UNION ( SELECT 1 UNION SELECT 1 );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 )' at line 1
+( SELECT 1 UNION SELECT 1 ) UNION SELECT 1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 ) UNION SELECT 1' at line 1
+SELECT ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1
+SELECT ( ( SELECT 1 UNION SELECT 1 ) UNION SELECT 1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1' at line 1
+SELECT ( SELECT 1 UNION SELECT 1 UNION SELECT 1 );
+( SELECT 1 UNION SELECT 1 UNION SELECT 1 )
+1
+SELECT ((SELECT 1 UNION SELECT 1 UNION SELECT 1));
+((SELECT 1 UNION SELECT 1 UNION SELECT 1))
+1
+SELECT * FROM ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1
+SELECT * FROM ( ( SELECT 1 UNION SELECT 1 ) UNION SELECT 1 );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ') UNION SELECT 1 )' at line 1
+SELECT * FROM ( SELECT 1 UNION SELECT 1 UNION SELECT 1 ) a;
+1
+1
+SELECT * FROM t1 WHERE a =     ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1
+SELECT * FROM t1 WHERE a = ALL ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1
+SELECT * FROM t1 WHERE a = ANY ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1
+SELECT * FROM t1 WHERE a IN    ( SELECT 1 UNION ( SELECT 1 UNION SELECT 1 ) );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 ) )' at line 1
+SELECT * FROM t1 WHERE a =     ( ( SELECT 1 UNION SELECT 1 )  UNION SELECT 1 );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 )' at line 1
+SELECT * FROM t1 WHERE a = ALL ( ( SELECT 1 UNION SELECT 1 )  UNION SELECT 1 );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 )  UNION SELECT 1 )' at line 1
+SELECT * FROM t1 WHERE a = ANY ( ( SELECT 1 UNION SELECT 1 )  UNION SELECT 1 );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 )  UNION SELECT 1 )' at line 1
+SELECT * FROM t1 WHERE a IN    ( ( SELECT 1 UNION SELECT 1 )  UNION SELECT 1 );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT 1 )' at line 1
+SELECT * FROM t1 WHERE a =     ( SELECT 1 UNION SELECT 1 UNION SELECT 1 );
+a
+1
+SELECT * FROM t1 WHERE a = ALL ( SELECT 1 UNION SELECT 1 UNION SELECT 1 );
+a
+1
+SELECT * FROM t1 WHERE a = ANY ( SELECT 1 UNION SELECT 1 UNION SELECT 1 );
+a
+1
+SELECT * FROM t1 WHERE a IN    ( SELECT 1 UNION SELECT 1 UNION SELECT 1 );
+a
+1
+SELECT * FROM t1 WHERE EXISTS ( SELECT 1 UNION SELECT 1 INTO @v );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @v )' at line 1
+SELECT EXISTS(SELECT 1+1);
+EXISTS(SELECT 1+1)
+1
+SELECT EXISTS(SELECT 1+1 INTO @test);
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @test)' at line 1
+SELECT * FROM t1 WHERE a IN ( SELECT 1 UNION SELECT 1 INTO @v );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @v )' at line 1
+SELECT * FROM t1 WHERE EXISTS ( SELECT 1 INTO @v );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @v )' at line 1
+SELECT * FROM t1 WHERE a IN ( SELECT 1 INTO @v );
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'INTO @v )' at line 1
+DROP TABLE t1, t2;
+CREATE TABLE t1 (a ENUM('rainbow'));
+INSERT INTO t1 VALUES (),(),(),(),();
+SELECT 1 FROM t1 GROUP BY (SELECT 1 FROM t1 ORDER BY AVG(LAST_INSERT_ID()));
+1
+1
+DROP TABLE t1;
+CREATE TABLE t1 (a LONGBLOB);
+INSERT INTO t1 SET a = 'aaaa';
+INSERT INTO t1 SET a = 'aaaa';
+SELECT 1 FROM t1 GROUP BY
+(SELECT LAST_INSERT_ID() FROM t1 ORDER BY MIN(a) ASC LIMIT 1);
+1
+1
+DROP TABLE t1;
+#
+# Bug #49512 : subquery with aggregate function crash 
+#   subselect_single_select_engine::exec()
+CREATE TABLE t1(a INT);
+INSERT INTO t1 VALUES();
+# should not crash
+SELECT 1 FROM t1 WHERE a <> SOME
+(
+SELECT MAX((SELECT a FROM t1 LIMIT 1)) AS d
+FROM t1,t1 a
+);
+1
+DROP TABLE t1;
+#
+# Bug #45989 take 2 : memory leak after explain encounters an 
+# error in the query
+#
+CREATE TABLE t1(a LONGTEXT);
+INSERT INTO t1 VALUES (repeat('a',@@global.max_allowed_packet));
+INSERT INTO t1 VALUES (repeat('b',@@global.max_allowed_packet));
+EXPLAIN EXTENDED SELECT DISTINCT 1 FROM t1,
+(SELECT DISTINCTROW a AS away FROM t1 GROUP BY a WITH ROLLUP) AS d1  
+WHERE t1.a = d1.a;
+ERROR 42S22: Unknown column 'd1.a' in 'where clause'
+DROP TABLE t1;
+Set up test tables.
+CREATE TABLE t1 (
+t1_id INT UNSIGNED,
+PRIMARY KEY(t1_id)
+) Engine=MyISAM;
+INSERT INTO t1 (t1_id) VALUES (1), (2), (3), (4), (5);
+CREATE TABLE t2 SELECT * FROM t1;
+CREATE TABLE t3 (
+t3_id INT UNSIGNED AUTO_INCREMENT,
+t1_id INT UNSIGNED,
+amount DECIMAL(16,2),
+PRIMARY KEY(t3_id),
+KEY(t1_id)
+) Engine=MyISAM;
+INSERT INTO t3 (t1_id, t3_id, amount) 
+VALUES (1, 1, 100.00), (2, 2, 200.00), (4, 4, 400.00);
+This is the 'inner query' running by itself.
+Produces correct results.
+SELECT
+t1.t1_id,
+IFNULL((SELECT SUM(amount) FROM t3 WHERE t3.t1_id=t1.t1_id), 0) AS total_amount
+FROM
+t1
+LEFT JOIN t2 ON t2.t1_id=t1.t1_id
+GROUP BY
+t1.t1_id
+;
+t1_id	total_amount
+1	100.00
+2	200.00
+3	0.00
+4	400.00
+5	0.00
+SELECT * FROM (the same inner query)
+Produces correct results.
+SELECT * FROM (
+SELECT
+t1.t1_id,
+IFNULL((SELECT SUM(amount) FROM t3 WHERE t3.t1_id=t1.t1_id), 0) AS total_amount
+FROM
+t1
+LEFT JOIN t2 ON t2.t1_id=t1.t1_id
+GROUP BY
+t1.t1_id
+) AS t;
+t1_id	total_amount
+1	100.00
+2	200.00
+3	0.00
+4	400.00
+5	0.00
+Now make t2.t1_id part of a key.
+ALTER TABLE t2 ADD PRIMARY KEY(t1_id);
+Same inner query by itself.
+Still correct results.
+SELECT
+t1.t1_id,
+IFNULL((SELECT SUM(amount) FROM t3 WHERE t3.t1_id=t1.t1_id), 0) AS total_amount
+FROM
+t1
+LEFT JOIN t2 ON t2.t1_id=t1.t1_id
+GROUP BY
+t1.t1_id;
+t1_id	total_amount
+1	100.00
+2	200.00
+3	0.00
+4	400.00
+5	0.00
+SELECT * FROM (the same inner query), now with indexes on the LEFT JOIN
+SELECT * FROM (
+SELECT
+t1.t1_id,
+IFNULL((SELECT SUM(amount) FROM t3 WHERE t3.t1_id=t1.t1_id), 0) AS total_amount
+FROM
+t1
+LEFT JOIN t2 ON t2.t1_id=t1.t1_id
+GROUP BY
+t1.t1_id
+) AS t;
+t1_id	total_amount
+1	100.00
+2	200.00
+3	0.00
+4	400.00
+5	0.00
+DROP TABLE t3;
+DROP TABLE t2;
+DROP TABLE t1;
+#
+# Bug #52711: Segfault when doing EXPLAIN SELECT with 
+#  union...order by (select... where...)
+#
+CREATE TABLE t1 (a VARCHAR(10), FULLTEXT KEY a (a));
+INSERT INTO t1 VALUES (1),(2);
+CREATE TABLE t2 (b INT);
+INSERT INTO t2 VALUES (1),(2);
+# Should not crash
+EXPLAIN
+SELECT * FROM t2 UNION SELECT * FROM t2
+ORDER BY (SELECT * FROM t1 WHERE MATCH(a) AGAINST ('+abc' IN BOOLEAN MODE));
+# Should not crash
+SELECT * FROM t2 UNION SELECT * FROM t2
+ORDER BY (SELECT * FROM t1 WHERE MATCH(a) AGAINST ('+abc' IN BOOLEAN MODE));
+DROP TABLE t1,t2;
+#
+# Bug #58818: Incorrect result for IN/ANY subquery
+# with HAVING condition 
+#
+CREATE TABLE t1(i INT);
+INSERT INTO t1 VALUES (1), (2), (3);
+CREATE TABLE t1s(i INT);
+INSERT INTO t1s VALUES (10), (20), (30);
+CREATE TABLE t2s(i INT);
+INSERT INTO t2s VALUES (100), (200), (300);
+SELECT * FROM t1
+WHERE t1.i NOT IN
+(
+SELECT STRAIGHT_JOIN t2s.i 
+FROM
+t1s LEFT OUTER JOIN t2s ON t2s.i = t1s.i
+HAVING t2s.i = 999
+);
+i
+1
+2
+3
+SELECT * FROM t1
+WHERE t1.I IN
+(
+SELECT STRAIGHT_JOIN t2s.i 
+FROM
+t1s LEFT OUTER JOIN t2s ON t2s.i = t1s.i
+HAVING t2s.i = 999
+) IS UNKNOWN;
+i
+SELECT * FROM t1
+WHERE NOT t1.I = ANY
+(
+SELECT STRAIGHT_JOIN t2s.i 
+FROM
+t1s LEFT OUTER JOIN t2s ON t2s.i = t1s.i
+HAVING t2s.i = 999
+);
+i
+1
+2
+3
+SELECT * FROM t1
+WHERE t1.i = ANY (
+SELECT STRAIGHT_JOIN t2s.i 
+FROM
+t1s LEFT OUTER JOIN t2s ON t2s.i = t1s.i
+HAVING t2s.i = 999
+) IS UNKNOWN;
+i
+DROP TABLE t1,t1s,t2s;
+# LP BUG#675248 - select->prep_where references on freed memory 
+CREATE TABLE t1 (a int, b int);
+insert into t1 values (1,1),(0,0);
+CREATE TABLE t2 (c int);
+insert into t2 values (1),(2);
+prepare stmt1 from "select sum(a),(select sum(c) from t2 where table1.b) as sub
+from t1 as table1 group by sub";
+execute stmt1;
+sum(a)	sub
+0	NULL
+1	3
+deallocate prepare stmt1;
+prepare stmt1 from "select sum(a),(select sum(c) from t2 having table1.b) as sub
+from t1 as table1";
+execute stmt1;
+sum(a)	sub
+1	3
+deallocate prepare stmt1;
+drop table t1,t2;
+#
+# Bug LP#693935/#58727: Assertion failure with 
+# a single row subquery returning more than one row
+#
+create table t1 (a char(1) charset utf8);
+insert into t1 values ('a'), ('b');
+create table t2 (a binary(1));
+insert into t2 values ('x'), ('y');
+select * from t2 where a=(select a from t1) and a='x';
+ERROR 21000: Subquery returns more than 1 row
+drop table t1,t2;
+End of 5.1 tests
+#
+# Bug #11765713 58705:
+# OPTIMIZER LET ENGINE DEPEND ON UNINITIALIZED VALUES
+# CREATED BY OPT_SUM_QUERY
+#
+CREATE TABLE t1(a INT NOT NULL, KEY (a));
+INSERT INTO t1 VALUES (0), (1);
+SELECT 1 as foo FROM t1 WHERE a < SOME
+(SELECT a FROM t1 WHERE a <=>
+(SELECT a FROM t1)
+);
+ERROR 21000: Subquery returns more than 1 row
+SELECT 1 as foo FROM t1 WHERE a < SOME
+(SELECT a FROM t1 WHERE a <=>
+(SELECT a FROM t1 where a is null)
+);
+foo
+DROP TABLE t1;
+#
+# Bug #57704: Cleanup code dies with void TABLE::set_keyread(bool): 
+#             Assertion `file' failed.
+#
+CREATE TABLE t1 (a INT);
+SELECT 1 FROM 
+(SELECT ROW(
+(SELECT 1 FROM t1 RIGHT JOIN 
+(SELECT 1 FROM t1, t1 t2) AS d ON 1),
+1) FROM t1) AS e;
+ERROR 21000: Operand should contain 1 column(s)
+DROP TABLE t1;
+#
+# Bug#13721076 CRASH WITH TIME TYPE/TIMESTAMP() AND WARNINGS IN SUBQUERY
+#
+CREATE TABLE t1(a TIME NOT NULL);
+INSERT INTO t1 VALUES ('00:00:32');
+SELECT 1 FROM t1 WHERE a >
+(SELECT timestamp(a) AS a FROM t1);
+1
+DROP TABLE t1;
+#
+# No BUG#, a case brought from 5.2's innodb_mysql_lock.test
+#
+create table t1 (i int  not null primary key);
+insert into t1 values (1),(2),(3),(4),(5);
+create table t2 (j int not null  primary key);
+insert into t2 values (1),(2),(3),(4),(5);
+create table t3 (k int not null primary key);
+insert into t3 values (1),(2),(3);
+create view v2 as select t2.j as j from t2 where t2.j in (select t1.i from t1);
+select * from t3 where k in (select j from v2);
+k
+1
+2
+3
+drop table t1,t2,t3;
+drop view v2;
+#
+# Bug#52068: Optimizer generates invalid semijoin materialization plan
+#
+drop table if exists ot1, ot2, it1, it2;
+CREATE TABLE ot1(a INTEGER);
+INSERT INTO ot1 VALUES(5), (8);
+CREATE TABLE it2(a INTEGER);
+INSERT INTO it2 VALUES(9), (5), (1), (8);
+CREATE TABLE it3(a INTEGER);
+INSERT INTO it3 VALUES(7), (1), (0), (5), (1), (4);
+CREATE TABLE ot4(a INTEGER);
+INSERT INTO ot4 VALUES(1), (3), (5), (7), (9), (7), (3), (1);
+SELECT * FROM ot1,ot4
+WHERE (ot1.a,ot4.a) IN (SELECT it2.a,it3.a
+FROM it2,it3);
+a	a
+5	1
+8	1
+5	5
+8	5
+5	7
+8	7
+5	7
+8	7
+5	1
+8	1
+explain SELECT * FROM ot1,ot4
+WHERE (ot1.a,ot4.a) IN (SELECT it2.a,it3.a
+FROM it2,it3);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	ot1	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	ot4	ALL	NULL	NULL	NULL	NULL	8	Using join buffer (flat, BNL join)
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	8	func,func	1	
+2	MATERIALIZED	it2	ALL	NULL	NULL	NULL	NULL	4	
+2	MATERIALIZED	it3	ALL	NULL	NULL	NULL	NULL	6	Using join buffer (flat, BNL join)
+DROP TABLE IF EXISTS ot1, ot4, it2, it3;
+#
+# Bug#729039: NULL keys used to evaluate subquery
+#
+CREATE TABLE t1 (a int) ;
+INSERT INTO t1 VALUES (NULL), (1), (NULL), (2);
+CREATE TABLE t2 (a int, INDEX idx(a)) ;
+INSERT INTO t2 VALUES (NULL), (1), (NULL);
+SELECT * FROM t1
+WHERE EXISTS (SELECT a FROM t2 USE INDEX () WHERE t2.a = t1.a);
+a
+1
+EXPLAIN
+SELECT * FROM t1
+WHERE EXISTS (SELECT a FROM t2 USE INDEX() WHERE t2.a = t1.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	3	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
+2	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	3	
+SELECT * FROM t1
+WHERE EXISTS (SELECT a FROM t2 WHERE t2.a = t1.a);
+a
+1
+EXPLAIN
+SELECT * FROM t1
+WHERE EXISTS (SELECT a FROM t2 WHERE t2.a = t1.a);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	3	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
+2	MATERIALIZED	t2	index	idx	idx	5	NULL	3	Using index
+DROP TABLE t1,t2;
+#
+# BUG#752992: Wrong results for a subquery with 'semijoin=on'
+#
+CREATE TABLE t1 (pk INTEGER PRIMARY KEY, i INTEGER NOT NULL);
+INSERT INTO t1 VALUES (11,0);
+INSERT INTO t1 VALUES (12,5);
+INSERT INTO t1 VALUES (15,0);
+CREATE TABLE t2 (pk INTEGER PRIMARY KEY, i INTEGER NOT NULL);
+INSERT INTO t2 VALUES (11,1);
+INSERT INTO t2 VALUES (12,2);
+INSERT INTO t2 VALUES (15,4);
+SET @save_join_cache_level=@@join_cache_level;
+SET join_cache_level=0;
+EXPLAIN SELECT * FROM t1 WHERE pk IN (SELECT it.pk FROM t2 JOIN t2 AS it ON 1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	3	
+1	PRIMARY	it	eq_ref	PRIMARY	PRIMARY	4	test.t1.pk	1	Using index
+1	PRIMARY	t2	index	NULL	PRIMARY	4	NULL	3	Using index; FirstMatch(it)
+SELECT * FROM t1 WHERE pk IN (SELECT it.pk FROM t2 JOIN t2 AS it ON 1);
+pk	i
+11	0
+12	5
+15	0
+SET join_cache_level=@save_join_cache_level;
+DROP table t1,t2;
+#
+# Bug#751350: crash with pushed condition for outer references when
+#             there should be none of such conditions
+#
+CREATE TABLE t1 (a int, b int) ;
+INSERT INTO t1 VALUES (0,0),(0,0);
+set @optimizer_switch_save=@@optimizer_switch;
+set @@optimizer_switch='semijoin=off,materialization=on,in_to_exists=on';
+EXPLAIN
+SELECT b FROM t1
+WHERE ('0') IN ( SELECT a  FROM t1 GROUP BY a )
+GROUP BY b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	Using temporary; Using filesort
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+SELECT b FROM t1
+WHERE ('0') IN ( SELECT a  FROM t1 GROUP BY a )
+GROUP BY b;
+b
+0
+set @@optimizer_switch=@optimizer_switch_save;
+DROP TABLE t1;
+#
+# Bug #11765713 58705:
+# OPTIMIZER LET ENGINE DEPEND ON UNINITIALIZED VALUES
+# CREATED BY OPT_SUM_QUERY
+#
+CREATE TABLE t1(a INT NOT NULL, KEY (a));
+INSERT INTO t1 VALUES (0), (1);
+SELECT 1 as foo FROM t1 WHERE a < SOME
+(SELECT a FROM t1 WHERE a <=>
+(SELECT a FROM t1)
+);
+ERROR 21000: Subquery returns more than 1 row
+SELECT 1 as foo FROM t1 WHERE a < SOME
+(SELECT a FROM t1 WHERE a <=>
+(SELECT a FROM t1 where a is null)
+);
+foo
+DROP TABLE t1;
+CREATE TABLE t1 (a int(11), b varchar(1));
+INSERT INTO t1 VALUES (2,NULL),(5,'d'),(7,'g');
+SELECT a FROM t1 WHERE b < ANY ( SELECT b FROM t1 GROUP BY b );
+a
+5
+SELECT a FROM t1 WHERE b < ANY ( SELECT b FROM t1 );
+a
+5
+SELECT a FROM t1 WHERE b > ANY ( SELECT b FROM t1 GROUP BY b );
+a
+7
+SELECT a FROM t1 WHERE b > ANY ( SELECT b FROM t1 );
+a
+7
+SELECT a FROM t1 WHERE b <= ANY ( SELECT b FROM t1 GROUP BY b );
+a
+5
+7
+SELECT a FROM t1 WHERE b <= ANY ( SELECT b FROM t1 );
+a
+5
+7
+SELECT a FROM t1 WHERE b >= ANY ( SELECT b FROM t1 GROUP BY b );
+a
+5
+7
+SELECT a FROM t1 WHERE b >= ANY ( SELECT b FROM t1 );
+a
+5
+7
+SELECT a FROM t1 WHERE b = ANY ( SELECT b FROM t1 );
+a
+5
+7
+SELECT a FROM t1 WHERE b = ANY ( SELECT b FROM t1 GROUP BY b );
+a
+5
+7
+SELECT a FROM t1 WHERE b <> ANY ( SELECT b FROM t1 );
+a
+5
+7
+SELECT a FROM t1 WHERE b <> ANY ( SELECT b FROM t1 GROUP BY b );
+a
+5
+7
+SELECT a FROM t1 WHERE b < ALL ( SELECT b FROM t1 GROUP BY b );
+a
+SELECT a FROM t1 WHERE b < ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b > ALL ( SELECT b FROM t1 GROUP BY b );
+a
+SELECT a FROM t1 WHERE b > ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b <= ALL ( SELECT b FROM t1 GROUP BY b );
+a
+SELECT a FROM t1 WHERE b <= ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b >= ALL ( SELECT b FROM t1 GROUP BY b );
+a
+SELECT a FROM t1 WHERE b >= ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b = ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b = ALL ( SELECT b FROM t1 GROUP BY b );
+a
+SELECT a FROM t1 WHERE b <> ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b <> ALL ( SELECT b FROM t1 GROUP BY b );
+a
+delete from t1;
+INSERT INTO t1 VALUES (2,NULL),(5,'d'),(7,'g');
+SELECT a FROM t1 WHERE b < ANY ( SELECT b FROM t1 GROUP BY b );
+a
+5
+SELECT a FROM t1 WHERE b < ANY ( SELECT b FROM t1 );
+a
+5
+SELECT a FROM t1 WHERE b > ANY ( SELECT b FROM t1 GROUP BY b );
+a
+7
+SELECT a FROM t1 WHERE b > ANY ( SELECT b FROM t1 );
+a
+7
+SELECT a FROM t1 WHERE b <= ANY ( SELECT b FROM t1 GROUP BY b );
+a
+5
+7
+SELECT a FROM t1 WHERE b <= ANY ( SELECT b FROM t1 );
+a
+5
+7
+SELECT a FROM t1 WHERE b >= ANY ( SELECT b FROM t1 GROUP BY b );
+a
+5
+7
+SELECT a FROM t1 WHERE b >= ANY ( SELECT b FROM t1 );
+a
+5
+7
+SELECT a FROM t1 WHERE b = ANY ( SELECT b FROM t1 );
+a
+5
+7
+SELECT a FROM t1 WHERE b = ANY ( SELECT b FROM t1 GROUP BY b );
+a
+5
+7
+SELECT a FROM t1 WHERE b <> ANY ( SELECT b FROM t1 );
+a
+5
+7
+SELECT a FROM t1 WHERE b <> ANY ( SELECT b FROM t1 GROUP BY b );
+a
+5
+7
+SELECT a FROM t1 WHERE b < ALL ( SELECT b FROM t1 GROUP BY b );
+a
+SELECT a FROM t1 WHERE b < ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b > ALL ( SELECT b FROM t1 GROUP BY b );
+a
+SELECT a FROM t1 WHERE b > ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b <= ALL ( SELECT b FROM t1 GROUP BY b );
+a
+SELECT a FROM t1 WHERE b <= ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b >= ALL ( SELECT b FROM t1 GROUP BY b );
+a
+SELECT a FROM t1 WHERE b >= ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b = ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b = ALL ( SELECT b FROM t1 GROUP BY b );
+a
+SELECT a FROM t1 WHERE b <> ALL ( SELECT b FROM t1 );
+a
+SELECT a FROM t1 WHERE b <> ALL ( SELECT b FROM t1 GROUP BY b );
+a
+drop table t1;
+#
+# Fix of lp:780386 (NULL left part with empty ALL subquery).
+#
+CREATE TABLE t1 ( f11 int) ;
+INSERT IGNORE INTO t1 VALUES (0),(0);
+CREATE TABLE t2 ( f3 int, f10 int, KEY (f10,f3)) ;
+INSERT IGNORE INTO t2 VALUES (NULL,NULL),(5,0);
+DROP TABLE IF EXISTS t3;
+Warnings:
+Note	1051	Unknown table 't3'
+CREATE TABLE t3 ( f3 int) ;
+INSERT INTO t3 VALUES (0),(0);
+SELECT a1.f3 AS r FROM t2 AS a1 , t1 WHERE a1.f3 < ALL ( SELECT f3 FROM t3 WHERE f3 = 1 ) ;
+r
+NULL
+5
+NULL
+5
+DROP TABLE t1, t2, t3;
+#
+# Bug#12763207 - ASSERT IN SUBSELECT::SINGLE_VALUE_TRANSFORMER
+#
+CREATE TABLE t1(a1 int);
+INSERT INTO t1 VALUES (1),(2);
+CREATE TABLE t2(a1 int);
+INSERT INTO t2 VALUES (3);
+SELECT @@session.sql_mode INTO @old_sql_mode;
+SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT 2 FROM t2);
+1
+1
+1
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT 2.0 FROM t2);
+1
+1
+1
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT 'a' FROM t2);
+1
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t2);
+1
+1
+1
+SET SESSION sql_mode=@old_sql_mode;
+DROP TABLE t1, t2;
+create table t2(i int);
+insert into t2 values(0);
+SELECT @@session.sql_mode INTO @old_sql_mode;
+SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
+CREATE VIEW v1 AS  
+SELECT 'f' FROM t2 UNION SELECT 'x' FROM t2
+;
+CREATE TABLE t1 (
+pk int NOT NULL,
+col_varchar_key varchar(1) DEFAULT NULL,
+PRIMARY KEY (pk),
+KEY col_varchar_key (col_varchar_key)
+);
+SELECT t1.pk
+FROM t1
+WHERE t1.col_varchar_key < ALL ( SELECT * FROM v1 )
+;
+pk
+SET SESSION sql_mode=@old_sql_mode;
+drop table t2, t1;
+drop view v1;
+#
+# BUG#50257: Missing info in REF column of the EXPLAIN 
+#            lines for subselects
+#
+CREATE TABLE t1 (a INT, b INT, INDEX (a));
+INSERT INTO t1 VALUES (3, 10), (2, 20), (7, 10), (5, 20);
+EXPLAIN SELECT * FROM (SELECT * FROM t1 WHERE a=7) t;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	a	a	5	const	1	
+EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	4	
+2	SUBQUERY	t1	ref	a	a	5	const	1	Using index
+DROP TABLE t1;
+#
+# BUG#12616253 - WRONG RESULT WITH EXISTS(SUBQUERY) (MISSING ROWS)
+# (duplicate of LP bug #888456)
+#
+CREATE TABLE t1 (f1 varchar(1));
+INSERT INTO t1 VALUES ('v'),('s');
+CREATE TABLE t2 (f1_key varchar(1), KEY (f1_key));
+INSERT INTO t2 VALUES ('j'),('v'),('c'),('m'),('d'),
+('d'),('y'),('t'),('d'),('s');
+EXPLAIN
+SELECT table1.f1, table2.f1_key FROM t1 AS table1, t2 AS table2
+WHERE EXISTS (SELECT DISTINCT f1_key FROM t2 
+WHERE f1_key != table2.f1_key AND f1_key >= table1.f1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	table1	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	table2	index	NULL	f1_key	4	NULL	10	Using where; Using index; Using join buffer (flat, BNL join)
+2	DEPENDENT SUBQUERY	t2	index	f1_key	f1_key	4	NULL	10	Using where; Using index
+SELECT table1.f1, table2.f1_key FROM t1 AS table1, t2 AS table2
+WHERE EXISTS (SELECT DISTINCT f1_key FROM t2 
+WHERE f1_key != table2.f1_key AND f1_key >= table1.f1);
+f1	f1_key
+v	j
+s	j
+v	v
+s	v
+v	c
+s	c
+v	m
+s	m
+v	d
+s	d
+v	d
+s	d
+v	y
+s	y
+v	t
+s	t
+v	d
+s	d
+v	s
+s	s
+DROP TABLE t1,t2;
+#
+# LP bug 919427: EXPLAIN for a query over a single-row table 
+#                with IN subquery in WHERE condition
+# 
+CREATE TABLE ot (
+col_int_nokey int(11), 
+col_varchar_nokey varchar(1)
+) ;
+INSERT INTO ot VALUES (1,'x');
+CREATE TABLE it1(
+col_int_key int(11), 
+col_varchar_key varchar(1), 
+KEY idx_cvk_cik (col_varchar_key,col_int_key)
+);
+INSERT INTO it1 VALUES (NULL,'x'), (NULL,'f');
+CREATE TABLE it2 (
+col_int_key int(11),
+col_varchar_key varchar(1),
+col_varchar_key2 varchar(1),
+KEY idx_cvk_cvk2_cik (col_varchar_key, col_varchar_key2, col_int_key),
+KEY idx_cvk_cik (col_varchar_key, col_int_key)
+);
+INSERT INTO it2 VALUES (NULL,'x','x'), (NULL,'f','f');
+EXPLAIN
+SELECT col_int_nokey FROM ot 
+WHERE col_varchar_nokey IN 
+(SELECT col_varchar_key FROM it1 WHERE col_int_key IS NULL);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	ot	system	NULL	NULL	NULL	NULL	1	
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	
+2	MATERIALIZED	it1	ref	idx_cvk_cik	idx_cvk_cik	9	const,const	1	Using where; Using index
+SELECT col_int_nokey FROM ot 
+WHERE col_varchar_nokey IN 
+(SELECT col_varchar_key FROM it1 WHERE col_int_key IS NULL);
+col_int_nokey
+1
+EXPLAIN
+SELECT col_int_nokey FROM ot
+WHERE (col_varchar_nokey, 'x') IN
+(SELECT col_varchar_key, col_varchar_key2 FROM it2);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	ot	system	NULL	NULL	NULL	NULL	1	
+1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	8	func,func	1	
+2	MATERIALIZED	it2	ref	idx_cvk_cvk2_cik,idx_cvk_cik	idx_cvk_cvk2_cik	8	const,const	1	Using where; Using index
+SELECT col_int_nokey FROM ot
+WHERE (col_varchar_nokey, 'x') IN
+(SELECT col_varchar_key, col_varchar_key2 FROM it2);
+col_int_nokey
+1
+DROP TABLE ot,it1,it2;
+#
+# MDEV-746
+# Bug#13651009 WRONG RESULT FROM DERIVED TABLE IF THE SUBQUERY
+# HAS AN EMPTY RESULT
+#
+CREATE TABLE t1 (
+pk int NOT NULL,
+col_int_nokey int NOT NULL,
+col_int_key int NOT NULL,
+col_time_key time NOT NULL,
+col_varchar_key varchar(1) NOT NULL,
+col_varchar_nokey varchar(1) NOT NULL,
+PRIMARY KEY (pk),
+KEY col_int_key (col_int_key),
+KEY col_time_key (col_time_key),
+KEY col_varchar_key (col_varchar_key,col_int_key)
+) ENGINE=MyISAM;
+CREATE TABLE t2 (
+pk int NOT NULL AUTO_INCREMENT,
+col_int_nokey int NOT NULL,
+col_int_key int NOT NULL,
+col_time_key time NOT NULL,
+col_varchar_key varchar(1) NOT NULL,
+col_varchar_nokey varchar(1) NOT NULL,
+PRIMARY KEY (pk),
+KEY col_int_key (col_int_key),
+KEY col_time_key (col_time_key),
+KEY col_varchar_key (col_varchar_key,col_int_key)
+) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (1,4,4,'00:00:00','b','b');
+SET @var2:=4, @var3:=8;
+
+Testcase without inner subquery
+EXPLAIN SELECT @var3:=12, sq4_alias1.*
+FROM t1 AS sq4_alias1
+WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR
+sq4_alias1.col_varchar_key = @var3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+SELECT @var3:=12, sq4_alias1.*
+FROM t1 AS sq4_alias1
+WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR
+sq4_alias1.col_varchar_key = @var3;
+@var3:=12	pk	col_int_nokey	col_int_key	col_time_key	col_varchar_key	col_varchar_nokey
+SELECT @var3;
+@var3
+8
+EXPLAIN SELECT * FROM ( SELECT @var3:=12, sq4_alias1.*
+FROM t1 AS sq4_alias1
+WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR
+sq4_alias1.col_varchar_key = @var3 ) AS alias3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
+SELECT * FROM ( SELECT @var3:=12, sq4_alias1.*
+FROM t1 AS sq4_alias1
+WHERE (sq4_alias1.col_varchar_key + NULL) IS NULL OR
+sq4_alias1.col_varchar_key = @var3 ) AS alias3;
+@var3:=12	pk	col_int_nokey	col_int_key	col_time_key	col_varchar_key	col_varchar_nokey
+SELECT @var3;
+@var3
+8
+
+Testcase with inner subquery; crashed WL#6095
+SET @var3=8;
+EXPLAIN SELECT sq4_alias1.*
+FROM t1 AS sq4_alias1
+WHERE (sq4_alias1.col_varchar_key , sq4_alias1.col_varchar_nokey)
+NOT IN
+(SELECT c_sq1_alias1.col_varchar_key AS c_sq1_field1,
+c_sq1_alias1.col_varchar_nokey AS c_sq1_field2
+FROM t2 AS c_sq1_alias1
+WHERE (c_sq1_alias1.col_int_nokey != @var2
+OR c_sq1_alias1.pk != @var3));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	c_sq1_alias1	system	PRIMARY	NULL	NULL	NULL	1	
+SELECT sq4_alias1.*
+FROM t1 AS sq4_alias1
+WHERE (sq4_alias1.col_varchar_key , sq4_alias1.col_varchar_nokey)
+NOT IN
+(SELECT c_sq1_alias1.col_varchar_key AS c_sq1_field1,
+c_sq1_alias1.col_varchar_nokey AS c_sq1_field2
+FROM t2 AS c_sq1_alias1
+WHERE (c_sq1_alias1.col_int_nokey != @var2
+OR c_sq1_alias1.pk != @var3));
+pk	col_int_nokey	col_int_key	col_time_key	col_varchar_key	col_varchar_nokey
+EXPLAIN SELECT * FROM ( SELECT sq4_alias1.*
+FROM t1 AS sq4_alias1
+WHERE (sq4_alias1.col_varchar_key , sq4_alias1.col_varchar_nokey)
+NOT IN
+(SELECT c_sq1_alias1.col_varchar_key AS c_sq1_field1,
+c_sq1_alias1.col_varchar_nokey AS c_sq1_field2
+FROM t2 AS c_sq1_alias1
+WHERE (c_sq1_alias1.col_int_nokey != @var2
+OR c_sq1_alias1.pk != @var3)) ) AS alias3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+3	DEPENDENT SUBQUERY	c_sq1_alias1	system	PRIMARY	NULL	NULL	NULL	1	
+SELECT * FROM ( SELECT sq4_alias1.*
+FROM t1 AS sq4_alias1
+WHERE (sq4_alias1.col_varchar_key , sq4_alias1.col_varchar_nokey)
+NOT IN
+(SELECT c_sq1_alias1.col_varchar_key AS c_sq1_field1,
+c_sq1_alias1.col_varchar_nokey AS c_sq1_field2
+FROM t2 AS c_sq1_alias1
+WHERE (c_sq1_alias1.col_int_nokey != @var2
+OR c_sq1_alias1.pk != @var3)) ) AS alias3;
+pk	col_int_nokey	col_int_key	col_time_key	col_varchar_key	col_varchar_nokey
+DROP TABLE t1,t2;
+End of 5.2 tests
+#
+# BUG#779885: Crash in eliminate_item_equal with materialization=on in
+#
+CREATE TABLE t1 ( f1 int );
+INSERT INTO t1 VALUES (19), (20);
+CREATE TABLE t2 ( f10 varchar(32) );
+INSERT INTO t2 VALUES ('c'),('d');
+CREATE TABLE t3 ( f10 varchar(32) );
+INSERT INTO t3 VALUES ('a'),('b');
+SELECT *
+FROM t1
+WHERE
+( 't' ) IN (
+SELECT t3.f10
+FROM t3
+JOIN t2
+ON t2.f10 = t3.f10
+);
+f1
+DROP TABLE t1,t2,t3;
+#
+# BUG lp:813473: Wrong result with outer join + NOT IN subquery
+# This bug is a duplicate of Bug#11764086 whose test case is added below
+#
+CREATE TABLE t1 (c int) ;
+INSERT INTO t1 VALUES (5),(6);
+CREATE TABLE t2 (a int, b int) ;
+INSERT INTO t2 VALUES (20,9),(20,9);
+create table t3 (d int, e int);
+insert into t3 values (2, 9), (3,10);
+SET @save_optimizer_switch=@@optimizer_switch;
+SET optimizer_switch='outer_join_with_cache=off';
+EXPLAIN
+SELECT t2.b , t1.c
+FROM t2 LEFT JOIN t1 ON t1.c < 3
+WHERE (t2.b , t1.c) NOT IN (SELECT * from t3);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
+SELECT t2.b , t1.c
+FROM t2 LEFT JOIN t1 ON t1.c < 3
+WHERE (t2.b, t1.c) NOT IN (SELECT * from t3);
+b	c
+9	NULL
+9	NULL
+SET optimizer_switch=@save_optimizer_switch;
+drop table t1, t2, t3;
+#
+# BUG#50257: Missing info in REF column of the EXPLAIN 
+#            lines for subselects
+#
+CREATE TABLE t1 (a INT, b INT, INDEX (a));
+INSERT INTO t1 VALUES (3, 10), (2, 20), (7, 10), (5, 20);
+
+set @tmp_optimizer_switch=@@optimizer_switch;
+set optimizer_switch='derived_merge=off,derived_with_keys=off';
+EXPLAIN SELECT * FROM (SELECT * FROM t1 WHERE a=7) t;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+2	DERIVED	t1	ref	a	a	5	const	1	
+set optimizer_switch=@tmp_optimizer_switch;
+
+EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t1 WHERE a=7);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	4	
+2	SUBQUERY	t1	ref	a	a	5	const	1	Using index
+
+DROP TABLE t1;
+#
+# Bug#11764086: Null left operand to NOT IN in WHERE clause
+# behaves differently than real NULL
+#
+CREATE TABLE parent (id int);
+INSERT INTO parent VALUES (1), (2);
+CREATE TABLE child (parent_id int, other int);
+INSERT INTO child VALUES (1,NULL);
+# Offending query (c.parent_id is NULL for null-complemented rows only)
+SELECT    p.id, c.parent_id
+FROM      parent p
+LEFT JOIN child  c
+ON        p.id = c.parent_id
+WHERE     c.parent_id NOT IN (
+SELECT parent_id 
+FROM   child
+WHERE  parent_id = 3
+);
+id	parent_id
+1	1
+2	NULL
+# Some syntactic variations with IS FALSE and IS NOT TRUE
+SELECT    p.id, c.parent_id
+FROM      parent p
+LEFT JOIN child  c
+ON        p.id = c.parent_id
+WHERE     c.parent_id IN (
+SELECT parent_id 
+FROM   child
+WHERE  parent_id = 3
+) IS NOT TRUE;
+id	parent_id
+1	1
+2	NULL
+SELECT    p.id, c.parent_id
+FROM      parent p
+LEFT JOIN child  c
+ON        p.id = c.parent_id
+WHERE     c.parent_id IN (
+SELECT parent_id 
+FROM   child
+WHERE  parent_id = 3
+) IS FALSE;
+id	parent_id
+1	1
+2	NULL
+DROP TABLE parent, child;
+# End of test for bug#11764086.
+#
+# Bug 11765699 - 58690: !TABLE || (!TABLE->READ_SET || 
+#                BITMAP_IS_SET(TABLE->READ_SET, FIELD_INDEX
+#
+CREATE TABLE t1(a INT);
+INSERT INTO t1 VALUES (0), (1);
+CREATE TABLE t2(
+b TEXT, 
+c INT, 
+PRIMARY KEY (b(1))
+);
+INSERT INTO t2 VALUES ('a', 2), ('b', 3);
+SELECT 1 FROM t1 WHERE a = 
+(SELECT 1 FROM t2 WHERE b = 
+(SELECT 1 FROM t1 t11 WHERE c = 1 OR t1.a = 1 AND 1 = 2)
+ORDER BY b
+);
+1
+SELECT 1 FROM t1 WHERE a = 
+(SELECT 1 FROM t2 WHERE b = 
+(SELECT 1 FROM t1 t11 WHERE c = 1 OR t1.a = 1 AND 1 = 2)
+GROUP BY b
+);
+1
+DROP TABLE t1, t2;
+#
+# BUG#12616253 - WRONG RESULT WITH EXISTS(SUBQUERY) (MISSING ROWS)
+#
+CREATE TABLE t1 (f1 varchar(1));
+INSERT INTO t1 VALUES ('v'),('s');
+CREATE TABLE t2 (f1_key varchar(1), KEY (f1_key));
+INSERT INTO t2 VALUES ('j'),('v'),('c'),('m'),('d'),
+('d'),('y'),('t'),('d'),('s');
+SELECT table1.f1, table2.f1_key
+FROM t1 AS table1, t2 AS table2
+WHERE EXISTS 
+( 
+SELECT DISTINCT f1_key 
+FROM t2 
+WHERE f1_key != table2.f1_key AND f1_key >= table1.f1 );
+f1	f1_key
+v	j
+s	j
+v	v
+s	v
+v	c
+s	c
+v	m
+s	m
+v	d
+s	d
+v	d
+s	d
+v	y
+s	y
+v	t
+s	t
+v	d
+s	d
+v	s
+s	s
+explain SELECT table1.f1, table2.f1_key
+FROM t1 AS table1, t2 AS table2
+WHERE EXISTS 
+( 
+SELECT DISTINCT f1_key 
+FROM t2 
+WHERE f1_key != table2.f1_key AND f1_key >= table1.f1 );
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	table1	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	table2	index	NULL	f1_key	4	NULL	10	Using where; Using index; Using join buffer (flat, BNL join)
+2	DEPENDENT SUBQUERY	t2	index	f1_key	f1_key	4	NULL	10	Using where; Using index
+DROP TABLE t1,t2;
+#
+# lp:826279: assertion failure with GROUP BY a result of subquery
+#
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (0), (0);
+CREATE TABLE t2 (a int, b int, c int);
+INSERT INTO t2 VALUES (10,7,0), (0,7,0);
+CREATE TABLE t3 (a int, b int);
+INSERT INTO t3 VALUES (10,7), (0,7);
+SELECT SUM(DISTINCT b),
+(SELECT t2.a FROM t1 JOIN t2 ON t2.c != 0
+WHERE t.a != 0 AND t2.a != 0)
+FROM (SELECT * FROM t3) AS t
+GROUP BY 2;
+SUM(DISTINCT b)	(SELECT t2.a FROM t1 JOIN t2 ON t2.c != 0
+WHERE t.a != 0 AND t2.a != 0)
+7	NULL
+SELECT SUM(DISTINCT b), 
+(SELECT t2.a FROM t1,t2 WHERE t.a != 0 or 1=2 LIMIT 1)
+FROM (SELECT * FROM t3) AS t
+GROUP BY 2;
+SUM(DISTINCT b)	(SELECT t2.a FROM t1,t2 WHERE t.a != 0 or 1=2 LIMIT 1)
+7	NULL
+7	10
+DROP TABLE t1,t2,t3;
+#
+# Bug#12329653 
+# EXPLAIN, UNION, PREPARED STATEMENT, CRASH, SQL_FULL_GROUP_BY
+#
+CREATE TABLE t1(a1 int);
+INSERT INTO t1 VALUES (1),(2);
+SELECT @@session.sql_mode INTO @old_sql_mode;
+SET SESSION sql_mode='ONLY_FULL_GROUP_BY';
+SELECT 1 FROM t1 WHERE 1 < SOME (SELECT a1 FROM t1);
+1
+1
+1
+PREPARE stmt FROM 
+'SELECT 1 UNION ALL 
+SELECT 1 FROM t1
+ORDER BY
+(SELECT 1 FROM t1 AS t1_0  
+  WHERE 1 < SOME (SELECT a1 FROM t1)
+)' ;
+EXECUTE stmt ;
+ERROR 21000: Subquery returns more than 1 row
+EXECUTE stmt ;
+ERROR 21000: Subquery returns more than 1 row
+SET SESSION sql_mode=@old_sql_mode;
+DEALLOCATE PREPARE stmt;
+DROP TABLE t1;
+#
+# LP BUG#833777 Performance regression with deeply nested subqueries
+#
+create table t1 (a int not null, b char(10) not null);
+insert into t1 values (1, 'a');
+set @@optimizer_switch='in_to_exists=on,semijoin=off,materialization=off,subquery_cache=off';
+select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1 where a in (select a from t1)))))))))))))))))))))))))))));
+a
+1
+set @@optimizer_switch=@subselect_tmp;
+drop table t1;
+#
+# LP BUG#894397 Wrong result with in_to_exists, constant table , semijoin=OFF,materialization=OFF
+#
+CREATE TABLE t1 (a varchar(3));
+INSERT INTO t1 VALUES ('AAA'),('BBB');
+CREATE TABLE t2 (a varchar(3));
+INSERT INTO t2 VALUES ('CCC');
+set @@optimizer_switch='semijoin=off,materialization=off,in_to_exists=on,subquery_cache=off';
+SELECT * FROM t1 WHERE t1.a IN (SELECT t2.a FROM t2 WHERE t2.a < 'ZZZ');
+a
+set @@optimizer_switch=@subselect_tmp;
+drop table t1, t2;
+#
+# LP bug #859375: Assertion `0' failed in st_select_lex_unit::optimize
+# with view , UNION and prepared statement (rewriting fake_select
+# condition).
+#
+CREATE TABLE t1 ( f1 int NOT NULL, f4 varchar(1) NOT NULL) ;
+INSERT INTO t1 VALUES (6,'d'),(7,'y');
+CREATE TABLE t2 ( f1 int NOT NULL, f2 int NOT NULL) ;
+INSERT INTO t2 VALUES (10,7);
+CREATE VIEW v2 AS SELECT * FROM t2;
+PREPARE st1 FROM "
+        SELECT *
+        FROM t1
+        LEFT JOIN v2 ON ( v2.f2 = t1.f1 )
+        WHERE v2.f1 NOT IN (
+                SELECT 1 UNION
+                SELECT 247
+        )
+";
+EXECUTE st1;
+f1	f4	f1	f2
+7	y	10	7
+deallocate prepare st1;
+DROP VIEW v2;
+DROP TABLE t1,t2;
+#
+# LP bug #887458 Crash in subselect_union_engine::no_rows with
+# double UNION and join_cache_level=3,8
+# (IN/ALL/ANY optimizations should not be applied to fake_select)
+CREATE TABLE t2 ( a int, b varchar(1)) ;
+INSERT IGNORE INTO t2 VALUES (8,'y'),(8,'y');
+CREATE TABLE t1 ( b varchar(1)) ;
+INSERT IGNORE INTO t1 VALUES (NULL),(NULL);
+set @save_join_cache_level=@@join_cache_level;
+SET SESSION join_cache_level=3;
+SELECT *
+FROM t1, t2
+WHERE t2.b IN (
+SELECT 'm' UNION
+SELECT 'm'
+) OR t1.b <> SOME (
+SELECT 'v' UNION
+SELECT 't'
+);
+b	a	b
+set @@join_cache_level= @save_join_cache_level;
+drop table t1,t2;
+#
+# LP bug #885162 Got error 124 from storage engine with UNION inside
+# subquery and join_cache_level=3..8
+# (IN/ALL/ANY optimizations should not be applied to fake_select)
+#
+CREATE TABLE t1 (
+f1 varchar(1) DEFAULT NULL
+);
+INSERT INTO t1 VALUES ('c');
+set @save_join_cache_level=@@join_cache_level;
+SET SESSION join_cache_level=8;
+SELECT * FROM t1 WHERE t1.f1 IN ( SELECT 'k' UNION SELECT 'e' );
+f1
+set @@join_cache_level= @save_join_cache_level;
+drop table t1;
+#
+# LP BUG#747278 incorrect values of the NULL (no rows) single 
+# row subquery requested via element_index() interface
+#
+CREATE TABLE t1 (f1a int, f1b int) ;
+INSERT IGNORE INTO t1 VALUES (1,1),(2,2);
+CREATE TABLE t2 ( f2 int);
+INSERT IGNORE INTO t2 VALUES (3),(4);
+CREATE TABLE t3 (f3a int default 1, f3b int default 2);
+INSERT INTO t3 VALUES (1,1),(2,2);
+set @old_optimizer_switch = @@session.optimizer_switch;
+set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,subquery_cache=off,semijoin=off';
+SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
+(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a,f3a  FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
+(SELECT f3a,f3a  FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
+(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
+(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
+NULL
+SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
+(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a,f3a  FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
+(SELECT f3a,f3a  FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
+(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
+(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
+NULL
+set @@session.optimizer_switch=@old_optimizer_switch;
+SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
+(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a,f3a  FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
+(SELECT f3a,f3a  FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
+(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
+(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
+NULL
+SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
+(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a,f3a  FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
+(SELECT f3a,f3a  FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
+(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
+NULL
+NULL
+SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
+(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
+NULL
+select (null, null) = (null, null);
+(null, null) = (null, null)
+NULL
+SELECT (SELECT f3a, f3a FROM t3  where f3a > 3) = (0, 0);
+(SELECT f3a, f3a FROM t3  where f3a > 3) = (0, 0)
+NULL
+drop tables t1,t2,t3;
+#
+# LP BUG#825051 Wrong result with date/datetime and subquery with GROUP BY and in_to_exists
+#
+CREATE TABLE t1 (a date, KEY (a)) ;
+INSERT INTO t1 VALUES ('2009-01-01'),('2009-02-02');
+set @old_optimizer_switch = @@optimizer_switch;
+SET @@optimizer_switch='semijoin=off,materialization=off,in_to_exists=on,subquery_cache=off';
+EXPLAIN SELECT * FROM t1 WHERE a IN (SELECT a AS field1 FROM t1 GROUP BY field1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	index	NULL	a	4	NULL	2	Using where; Using index
+2	DEPENDENT SUBQUERY	t1	index_subquery	a	a	4	func	2	Using index
+SELECT * FROM t1 WHERE a IN (SELECT a AS field1 FROM t1 GROUP BY field1);
+a
+2009-01-01
+2009-02-02
+SET @@optimizer_switch='semijoin=off,materialization=on,in_to_exists=off,subquery_cache=off';
+EXPLAIN SELECT * FROM t1 WHERE a IN (SELECT a AS field1 FROM t1 GROUP BY field1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	index	NULL	a	4	NULL	2	Using where; Using index
+2	MATERIALIZED	t1	index	NULL	a	4	NULL	2	Using index
+SELECT * FROM t1 WHERE a IN (SELECT a AS field1 FROM t1 GROUP BY field1);
+a
+2009-01-01
+2009-02-02
+set @@optimizer_switch=@old_optimizer_switch;
+drop table t1;
+#
+# LP BUG#908269 incorrect condition in case of subqueries depending
+# on constant tables
+#
+CREATE TABLE t1 ( a INT );
+INSERT INTO t1 VALUES (1),(5);
+CREATE TABLE t2 ( b INT ) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (1);
+CREATE TABLE t3 ( c INT );
+INSERT INTO t3 VALUES (4),(5);
+SET optimizer_switch='subquery_cache=off';
+SELECT ( SELECT b FROM t2 WHERE b = a OR EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+( SELECT b FROM t2 WHERE b = a OR EXISTS ( SELECT c FROM t3 WHERE c = b ) )
+1
+NULL
+SELECT ( SELECT b FROM t2 WHERE b = a OR b * 0) FROM t1;
+( SELECT b FROM t2 WHERE b = a OR b * 0)
+1
+NULL
+SELECT ( SELECT b FROM t2 WHERE b = a OR rand() * 0) FROM t1;
+( SELECT b FROM t2 WHERE b = a OR rand() * 0)
+1
+NULL
+drop table t1,t2,t3;
+set optimizer_switch=@subselect_tmp;
+#
+# LP BUG#905353 Wrong non-empty result with a constant table,
+# aggregate function in subquery, MyISAM or Aria
+#
+CREATE TABLE t1 ( a INT ) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1);
+SELECT a FROM t1 WHERE ( SELECT MIN(a) = 100 );
+a
+drop table t1;
+#
+# LP BUG#985667 Wrong result with subquery in SELECT clause, and constant table in 
+# main query and implicit grouping
+#
+CREATE TABLE t1 (f1 int) engine=MyISAM;
+INSERT INTO t1 VALUES (7),(8);
+CREATE TABLE t2 (f2 int, f3 varchar(1)) engine=MyISAM;
+INSERT INTO t2 VALUES (3,'f');
+EXPLAIN
+SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	
+SELECT COUNT(f1), (SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
+COUNT(f1)	f4
+0	NULL
+EXPLAIN
+SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	
+SELECT COUNT(f1), exists(SELECT f1 FROM t1 WHERE f2 > 0 limit 1) AS f4 FROM t2, t1 WHERE 'v'= f3;
+COUNT(f1)	f4
+0	0
+EXPLAIN
+SELECT COUNT(f1), f2 > ALL (SELECT f1 FROM t1 WHERE f2 > 0) AS f4 FROM t2, t1 WHERE 'v'= f3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+SELECT COUNT(f1), f2 > ALL (SELECT f1 FROM t1 WHERE f2 > 0) AS f4 FROM t2, t1 WHERE 'v'= f3;
+COUNT(f1)	f4
+0	1
+EXPLAIN
+SELECT COUNT(f1), f2 IN (SELECT f1 FROM t1 WHERE f2 > 0) AS f4 FROM t2, t1 WHERE 'v'= f3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+SELECT COUNT(f1), f2 IN (SELECT f1 FROM t1 WHERE f2 > 0) AS f4 FROM t2, t1 WHERE 'v'= f3;
+COUNT(f1)	f4
+0	0
+drop table t1,t2;
+#
+# LP BUG#1002079 Server crashes in Item_singlerow_subselect::val_int with constant table,
+# HAVING, UNION in subquery
+#
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (7),(0);
+CREATE TABLE t2 (b INT);
+EXPLAIN
+SELECT SUM(a) AS f1, a AS f2 FROM (t1, t2) HAVING f2 >= ALL (SELECT 4 UNION SELECT 5) AND f1 = 7;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+3	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
+SELECT SUM(a) AS f1, a AS f2 FROM (t1, t2) HAVING f2 >= ALL (SELECT 4 UNION SELECT 5) AND f1 = 7;
+f1	f2
+drop table t1,t2;
+#
+# LP BUG#1008686 Server crashes in subselect_union_engine::no_rows on SELECT with impossible
+# WHERE and UNION in HAVING
+#
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1),(7);
+EXPLAIN
+SELECT MIN(a) AS min_a, a FROM t1 WHERE 0 HAVING a NOT IN ( SELECT 2 UNION SELECT 5 ) OR min_a != 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+3	DEPENDENT UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
+SELECT MIN(a) AS min_a, a FROM t1 WHERE 0 HAVING a NOT IN ( SELECT 2 UNION SELECT 5 ) OR min_a != 1;
+min_a	a
+EXPLAIN
+SELECT MIN(a) AS min_a, a FROM t1 WHERE 1=2 HAVING a NOT IN ( SELECT a from t1 UNION select a+1 from t1 ) OR min_a != 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+3	DEPENDENT UNION	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
+SELECT MIN(a) AS min_a, a FROM t1 WHERE 1=2 HAVING a NOT IN ( SELECT a from t1 UNION select a+1 from t1 ) OR min_a != 1;
+min_a	a
+drop table t1;
+#
+# MDEV-367: Different results with and without subquery_cache on
+# a query with a constant NOT IN condition
+#
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(2),(3);
+set @mdev367_optimizer_switch = @@optimizer_switch;
+set optimizer_switch = 'subquery_cache=on';
+SELECT * FROM t1 WHERE ( 3, 3 ) NOT IN ( SELECT NULL, NULL ) OR a > 100;
+a
+SELECT *, ( 3, 3 ) NOT IN ( SELECT NULL, NULL ) FROM t1;
+a	( 3, 3 ) NOT IN ( SELECT NULL, NULL )
+1	NULL
+2	NULL
+3	NULL
+set optimizer_switch=@mdev367_optimizer_switch;
+set optimizer_switch = 'subquery_cache=off';
+SELECT * FROM t1 WHERE ( 3, 3 ) NOT IN ( SELECT NULL, NULL ) OR a > 100;
+a
+SELECT *, ( 3, 3 ) NOT IN ( SELECT NULL, NULL ) FROM t1;
+a	( 3, 3 ) NOT IN ( SELECT NULL, NULL )
+1	NULL
+2	NULL
+3	NULL
+set optimizer_switch=@mdev367_optimizer_switch;
+DROP TABLE t1;
+#
+# MDEV-521 single value subselect transformation problem
+#
+CREATE TABLE t1 (f1 char(2), PRIMARY KEY (f1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES ('u1'),('u2');
+SELECT a.* FROM t1 a WHERE ( SELECT EXISTS ( SELECT 1 FROM t1 b WHERE b.f1 = a.f1 ) );
+f1
+u1
+u2
+FLUSH TABLES;
+SELECT a.* FROM t1 a WHERE ( SELECT EXISTS ( SELECT 1 FROM t1 b WHERE b.f1 = a.f1 ) );
+f1
+u1
+u2
+DROP TABLE t1;
+# return optimizer switch changed in the beginning of this test
+set optimizer_switch=@subselect_tmp;
+#
+# lp:944706 Query with impossible or constant subquery in WHERE or HAVING is not
+# precomputed and thus not part of optimization
+#
+CREATE TABLE t1 ( a VARCHAR(16), KEY (a) );
+INSERT INTO t1 VALUES ('Abilene'),('Akron'),('Albany'),('Albuquerque'),('Alexandria'),('Allentown'),
+('Amarillo'),('Anaheim'),('Anchorage'),('Ann Arbor'),('Arden-Arcade');
+EXPLAIN
+SELECT MAX( alias2.a ) AS field
+FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
+WHERE alias1.a = alias2.a OR alias1.a = 'y'
+HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible HAVING
+2	SUBQUERY	t1	index_subquery	a	a	19	const	1	Using index; Using where
+SELECT MAX( alias2.a ) AS field
+FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
+WHERE alias1.a = alias2.a OR alias1.a = 'y'
+HAVING field>'B' AND ( 'Moscow' ) IN ( SELECT a FROM t1 );
+field
+EXPLAIN
+SELECT MAX( alias2.a )
+FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
+WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	alias1	index	a	a	19	NULL	11	Using where; Using index
+1	PRIMARY	alias2	ref	a	a	19	test.alias1.a	2	Using index
+1	PRIMARY	alias3	index	NULL	a	19	NULL	11	Using index; Using join buffer (flat, BNL join)
+2	SUBQUERY	t1	index_subquery	a	a	19	const	1	Using index; Using where
+SELECT MAX( alias2.a )
+FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
+WHERE alias1.a = alias2.a OR ('Moscow') IN ( SELECT a FROM t1 );
+MAX( alias2.a )
+Arden-Arcade
+drop table t1;
+#
+# MDEV-277 CHEAP SQ: Server crashes in st_join_table::get_examined_rows
+# with semijoin+materialization, IN and = subqueries
+#
+CREATE TABLE t1 (a1 INT);
+INSERT INTO t1 VALUES (4),(6);
+CREATE TABLE t2 (b1 INT);
+INSERT INTO t2 VALUES (1),(7);
+EXPLAIN
+SELECT * FROM t1
+WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	
+2	SUBQUERY	<subquery3>	eq_ref	distinct_key	distinct_key	4	func	1	
+3	MATERIALIZED	t1	ALL	NULL	NULL	NULL	NULL	2	
+3	MATERIALIZED	t2	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
+SELECT * FROM t1
+WHERE a1 = (SELECT COUNT(*) FROM t1 WHERE a1 IN (SELECT a1 FROM t1, t2));
+a1
+drop table t1, t2;
+#
+# MDEV-287 CHEAP SQ: A query with subquery in SELECT list, EXISTS,
+# inner joins takes hundreds times longer
+#
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1),(7);
+CREATE TABLE t2 (b INT);
+INSERT INTO t2 VALUES (4),(5);
+CREATE TABLE t3 (c INT);
+INSERT INTO t3 VALUES (8),(3);
+set @@expensive_subquery_limit= 0;
+EXPLAIN
+SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
+FROM t2 alias1, t1 alias2, t1 alias3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	alias1	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	alias2	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
+1	PRIMARY	alias3	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
+2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer (flat, BNL join)
+3	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	2	
+flush status;
+SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
+FROM t2 alias1, t1 alias2, t1 alias3;
+(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
+NULL
+NULL
+NULL
+NULL
+NULL
+NULL
+NULL
+NULL
+show status like "subquery_cache%";
+Variable_name	Value
+Subquery_cache_hit	6
+Subquery_cache_miss	2
+show status like '%Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	8
+Handler_read_last	0
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_deleted	0
+Handler_read_rnd_next	22
+set @@expensive_subquery_limit= default;
+EXPLAIN
+SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
+FROM t2 alias1, t1 alias2, t1 alias3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	alias1	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	alias2	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
+1	PRIMARY	alias3	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
+2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	
+2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer (flat, BNL join)
+3	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	2	
+flush status;
+SELECT (SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
+FROM t2 alias1, t1 alias2, t1 alias3;
+(SELECT MIN(b) FROM t1, t2 WHERE b = a AND (b = alias1.b OR EXISTS (SELECT * FROM t3)))
+NULL
+NULL
+NULL
+NULL
+NULL
+NULL
+NULL
+NULL
+show status like "subquery_cache%";
+Variable_name	Value
+Subquery_cache_hit	0
+Subquery_cache_miss	0
+show status like '%Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	0
+Handler_read_last	0
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_deleted	0
+Handler_read_rnd_next	16
+drop table t1, t2, t3;
+#
+# MDEV-288 CHEAP SQ: Valgrind warnings "Memory lost" with IN and EXISTS nested subquery, materialization+semijoin
+#
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (0),(8);
+CREATE TABLE t2 (b INT PRIMARY KEY);
+INSERT INTO t2 VALUES (1),(2);
+EXPLAIN
+SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+2	MATERIALIZED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+3	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	
+SELECT * FROM t1 WHERE 4 IN (SELECT MAX(b) FROM t2 WHERE EXISTS (SELECT * FROM t1));
+a
+drop table t1,t2;
+#
+# MDEV-410: EXPLAIN shows type=range, while SHOW EXPLAIN and userstat show full table scan is used
+#
+CREATE TABLE t1 (a VARCHAR(3) PRIMARY KEY) ENGINE=MyISAM;
+INSERT INTO t1 VALUES ('USA');
+CREATE TABLE t2 (b INT, c VARCHAR(52), KEY(b)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (3813,'United States'),(3940,'Russia');
+CREATE TABLE t3 (d INT, KEY(d)) ENGINE=MyISAM;
+INSERT INTO t3 VALUES (12),(22),(9),(45);
+create table t4 like t3;
+insert into t4 select * from t3;
+# This should not show range access for table t2
+explain
+SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 
+WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 );
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
+1	PRIMARY	t2	ALL	b	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t3	ref	d	d	5	test.t2.b	2	Using where; Using index
+3	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+set @tmp_mdev410=@@global.userstat;
+set global userstat=on;
+flush table_statistics;
+flush index_statistics;
+SELECT MIN(b) FROM ( SELECT * FROM t1, t2, t3 WHERE d = b ) AS alias1 
+WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 );
+MIN(b)
+NULL
+# The following shows that t2 was indeed scanned with a full scan.
+show table_statistics;
+Table_schema	Table_name	Rows_read	Rows_changed	Rows_changed_x_#indexes
+test	t1	2	0	0
+test	t2	3	0	0
+show index_statistics;
+Table_schema	Table_name	Index_name	Rows_read
+test	t2	b	1
+set global userstat=@tmp_mdev410;
+DROP TABLE t1,t2,t3,t4;
+#
+# MDEV-430: Server crashes in select_describe on EXPLAIN with 
+#    materialization+semijoin, 2 nested subqueries, aggregate functions
+#
+CREATE TABLE t1 (a INT, KEY(a));
+INSERT INTO t1 VALUES (1),(8);
+CREATE TABLE t2 (b INT, KEY(b));
+INSERT INTO t2 VALUES (45),(17),(20);
+EXPLAIN SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t1, t2 WHERE b = a GROUP BY a HAVING a <> 1 ) ;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+2	SUBQUERY	t1	index	a	a	5	NULL	2	Using where; Using index
+2	SUBQUERY	t2	ref	b	b	5	test.t1.a	2	Using index
+DROP TABLE t1,t2;
+#
+# MDEV-435: Expensive subqueries may be evaluated during optimization in merge_key_fields
+#
+CREATE TABLE t1 (a INT, KEY(a)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (8),(0);
+CREATE TABLE t2 (b INT, c VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (4,'j'),(6,'v');
+CREATE TABLE t3 (d VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t3 VALUES ('b'),('c');
+EXPLAIN
+SELECT * FROM t1
+WHERE a = (SELECT MAX(b) FROM t2 WHERE c IN (SELECT MAX(d) FROM t3)) OR a = 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	index	a	a	5	NULL	2	Using where; Using index
+2	SUBQUERY	<subquery3>	ALL	distinct_key	NULL	NULL	NULL	1	
+2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer (flat, BNL join)
+3	MATERIALIZED	t3	ALL	NULL	NULL	NULL	NULL	2	
+SELECT * FROM t1
+WHERE a = (SELECT MAX(b) FROM t2 WHERE c IN (SELECT MAX(d) FROM t3)) OR a = 10;
+a
+drop table t1, t2, t3;
+#
+# MDEV-405: Server crashes in test_if_skip_sort_order on EXPLAIN with GROUP BY and HAVING in EXISTS subquery
+#
+CREATE TABLE t1 (a INT, KEY(a));
+INSERT INTO t1 VALUES (1),(8);
+CREATE TABLE t2 (b INT, KEY(b));
+INSERT INTO t2 VALUES (45),(17),(20);
+EXPLAIN SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t1, t2 WHERE b = a GROUP BY a HAVING a <> 1 ) ;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+2	SUBQUERY	t1	index	a	a	5	NULL	2	Using where; Using index
+2	SUBQUERY	t2	ref	b	b	5	test.t1.a	2	Using index
+DROP TABLE t1,t2;
+set optimizer_switch=default;
+select @@optimizer_switch like '%exists_to_in=on%';
+@@optimizer_switch like '%exists_to_in=on%'
+0
diff --git a/mysql-test/suite/sys_vars/r/engine_condition_pushdown_basic.result b/mysql-test/suite/sys_vars/r/engine_condition_pushdown_basic.result
index 55e6f747a19..937a3b164fa 100644
--- a/mysql-test/suite/sys_vars/r/engine_condition_pushdown_basic.result
+++ b/mysql-test/suite/sys_vars/r/engine_condition_pushdown_basic.result
@@ -9,7 +9,7 @@ SELECT @global_start_value;
 select @old_session_opt_switch:=@@session.optimizer_switch,
 @old_global_opt_switch:=@@global.optimizer_switch;
 @old_session_opt_switch:=@@session.optimizer_switch	@old_global_opt_switch:=@@global.optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 '#--------------------FN_DYNVARS_028_01------------------------#'
 SET @@session.engine_condition_pushdown = 0;
 Warnings:
@@ -212,7 +212,7 @@ select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 set @@session.engine_condition_pushdown = TRUE;
 Warnings:
 Warning	1287	'@@engine_condition_pushdown' is deprecated and will be removed in a future release. Please use '@@optimizer_switch' instead
@@ -220,7 +220,7 @@ select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-1	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+1	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 set @@session.engine_condition_pushdown = FALSE;
 Warnings:
 Warning	1287	'@@engine_condition_pushdown' is deprecated and will be removed in a future release. Please use '@@optimizer_switch' instead
@@ -228,7 +228,7 @@ select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 set @@global.engine_condition_pushdown = TRUE;
 Warnings:
 Warning	1287	'@@engine_condition_pushdown' is deprecated and will be removed in a future release. Please use '@@optimizer_switch' instead
@@ -236,7 +236,7 @@ select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-0	1	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+0	1	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 set @@global.engine_condition_pushdown = FALSE;
 Warnings:
 Warning	1287	'@@engine_condition_pushdown' is deprecated and will be removed in a future release. Please use '@@optimizer_switch' instead
@@ -244,31 +244,31 @@ select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 set @@session.optimizer_switch = "engine_condition_pushdown=on";
 select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-1	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+1	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 set @@session.optimizer_switch = "engine_condition_pushdown=off";
 select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 set @@global.optimizer_switch = "engine_condition_pushdown=on";
 select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-0	1	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+0	1	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 set @@global.optimizer_switch = "engine_condition_pushdown=off";
 select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 SET @@session.engine_condition_pushdown = @session_start_value;
 Warnings:
 Warning	1287	'@@engine_condition_pushdown' is deprecated and will be removed in a future release. Please use '@@optimizer_switch' instead
@@ -287,4 +287,4 @@ select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
diff --git a/mysql-test/suite/sys_vars/r/optimizer_switch_basic.result b/mysql-test/suite/sys_vars/r/optimizer_switch_basic.result
index 509c0706ca3..8a9c49def85 100644
--- a/mysql-test/suite/sys_vars/r/optimizer_switch_basic.result
+++ b/mysql-test/suite/sys_vars/r/optimizer_switch_basic.result
@@ -1,61 +1,61 @@
 SET @start_global_value = @@global.optimizer_switch;
 SELECT @start_global_value;
 @start_global_value
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 select @@global.optimizer_switch;
 @@global.optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 select @@session.optimizer_switch;
 @@session.optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 show global variables like 'optimizer_switch';
 Variable_name	Value
-optimizer_switch	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+optimizer_switch	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 show session variables like 'optimizer_switch';
 Variable_name	Value
-optimizer_switch	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+optimizer_switch	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 select * from information_schema.global_variables where variable_name='optimizer_switch';
 VARIABLE_NAME	VARIABLE_VALUE
-OPTIMIZER_SWITCH	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+OPTIMIZER_SWITCH	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 select * from information_schema.session_variables where variable_name='optimizer_switch';
 VARIABLE_NAME	VARIABLE_VALUE
-OPTIMIZER_SWITCH	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+OPTIMIZER_SWITCH	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
 set global optimizer_switch=10;
 set session optimizer_switch=5;
 select @@global.optimizer_switch;
 @@global.optimizer_switch
-index_merge=off,index_merge_union=on,index_merge_sort_union=off,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off
+index_merge=off,index_merge_union=on,index_merge_sort_union=off,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off,exists_to_in=off
 select @@session.optimizer_switch;
 @@session.optimizer_switch
-index_merge=on,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off
+index_merge=on,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off,exists_to_in=off
 set global optimizer_switch="index_merge_sort_union=on";
 set session optimizer_switch="index_merge=off";
 select @@global.optimizer_switch;
 @@global.optimizer_switch
-index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off
+index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off,exists_to_in=off
 select @@session.optimizer_switch;
 @@session.optimizer_switch
-index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off
+index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off,exists_to_in=off
 show global variables like 'optimizer_switch';
 Variable_name	Value
-optimizer_switch	index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off
+optimizer_switch	index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off,exists_to_in=off
 show session variables like 'optimizer_switch';
 Variable_name	Value
-optimizer_switch	index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off
+optimizer_switch	index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off,exists_to_in=off
 select * from information_schema.global_variables where variable_name='optimizer_switch';
 VARIABLE_NAME	VARIABLE_VALUE
-OPTIMIZER_SWITCH	index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off
+OPTIMIZER_SWITCH	index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off,exists_to_in=off
 select * from information_schema.session_variables where variable_name='optimizer_switch';
 VARIABLE_NAME	VARIABLE_VALUE
-OPTIMIZER_SWITCH	index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off
+OPTIMIZER_SWITCH	index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off,exists_to_in=off
 set session optimizer_switch="default";
 select @@session.optimizer_switch;
 @@session.optimizer_switch
-index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off
+index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=off,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=off,table_elimination=off,extended_keys=off,exists_to_in=off
 set optimizer_switch = replace(@@optimizer_switch, '=off', '=on');
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=on,mrr_sort_keys=on,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on,table_elimination=on,extended_keys=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=on,mrr_sort_keys=on,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on,table_elimination=on,extended_keys=on,exists_to_in=on
 set global optimizer_switch=1.1;
 ERROR 42000: Incorrect argument type to variable 'optimizer_switch'
 set global optimizer_switch=1e1;
@@ -67,4 +67,4 @@ ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'foobar'
 SET @@global.optimizer_switch = @start_global_value;
 SELECT @@global.optimizer_switch;
 @@global.optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
diff --git a/mysql-test/suite/sys_vars/r/optimizer_switch_eng_cond_pushdown1.result b/mysql-test/suite/sys_vars/r/optimizer_switch_eng_cond_pushdown1.result
index 7fb9e0aaaae..be4da117c2b 100644
--- a/mysql-test/suite/sys_vars/r/optimizer_switch_eng_cond_pushdown1.result
+++ b/mysql-test/suite/sys_vars/r/optimizer_switch_eng_cond_pushdown1.result
@@ -2,4 +2,4 @@ select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-1	1	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+1	1	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
diff --git a/mysql-test/suite/sys_vars/r/optimizer_switch_eng_cond_pushdown2.result b/mysql-test/suite/sys_vars/r/optimizer_switch_eng_cond_pushdown2.result
index 9eb3a8f942d..d1c5516d9ed 100644
--- a/mysql-test/suite/sys_vars/r/optimizer_switch_eng_cond_pushdown2.result
+++ b/mysql-test/suite/sys_vars/r/optimizer_switch_eng_cond_pushdown2.result
@@ -2,4 +2,4 @@ select @@session.engine_condition_pushdown,
 @@global.engine_condition_pushdown,
 @@session.optimizer_switch, @@global.optimizer_switch;
 @@session.engine_condition_pushdown	@@global.engine_condition_pushdown	@@session.optimizer_switch	@@global.optimizer_switch
-0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off
+0	0	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off	index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=off
diff --git a/mysql-test/t/subselect_exists2in.test b/mysql-test/t/subselect_exists2in.test
new file mode 100644
index 00000000000..94e7109e9d2
--- /dev/null
+++ b/mysql-test/t/subselect_exists2in.test
@@ -0,0 +1,739 @@
+
+--disable_warnings
+drop table if exists t1,t2,t3;
+--enable_warnings
+
+set optimizer_switch='exists_to_in=on';
+--echo #
+--echo # LP BUG#884644 exists2in broke name resolution
+--echo #
+
+CREATE TABLE t1 (f1 integer);
+
+--error ER_BAD_FIELD_ERROR
+SELECT * FROM t1 WHERE EXISTS (SELECT NO_SUCH_TABLE.NO_SUCH_FIELD FROM t1);
+
+drop table t1;
+
+--echo #
+--echo # LP BUG#884657 Wrong result with exists2in , correlated subquery
+--echo #
+
+CREATE TABLE t1 ( a varchar(1)) ;
+INSERT INTO t1 VALUES ('c'),('b');
+
+CREATE TABLE t2 ( b varchar(1)) ;
+INSERT INTO t2 VALUES ('v'),('v'),('c'),(NULL),('x'),('i'),('e'),('p'),('s'),('j'),('z'),('c'),('a'),('q'),('y'),(NULL),('r'),('v'),(NULL),('r');
+
+CREATE TABLE t3 ( a int NOT NULL , b varchar(1)) ;
+INSERT INTO t3 VALUES (29,'c');
+
+SELECT *
+FROM t1, t2
+WHERE EXISTS (
+ SELECT a
+ FROM t3
+ WHERE t3.b = t1.a
+ AND t3.b <> t2.b
+);
+
+
+INSERT INTO t3 VALUES (2,'c');
+alter table t1 add index aa (a);
+alter table t3 add index bb (b);
+--echo -- EXIST to IN then semijoin (has priority over IN to EXISTS)
+set optimizer_switch='exists_to_in=on,in_to_exists=on,semijoin=on,materialization=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+--echo -- EXIST to IN then IN to EXISTS
+set optimizer_switch='exists_to_in=on,in_to_exists=on,semijoin=off,materialization=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+--echo -- EXIST2IN then MATERIALIZATION
+set optimizer_switch='exists_to_in=on,in_to_exists=off,semijoin=off,materialization=on,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+--echo -- NO EXIST2IN
+set optimizer_switch='exists_to_in=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t3 WHERE t3.b = t1.a);
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+drop table t1,t2,t3;
+
+--echo # 
+--echo # From group_min_max.test
+--echo # 
+create table t1 (
+  a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(64) default ' '
+);
+
+insert into t1 (a1, a2, b, c, d) values
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
+('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
+('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
+('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
+('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'),
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
+('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
+('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
+('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
+('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4');
+
+create index idx_t1_0 on t1 (a1);
+create index idx_t1_1 on t1 (a1,a2,b,c);
+create index idx_t1_2 on t1 (a1,a2,b);
+analyze table t1;
+
+# t2 is the same as t1, but with some NULLs in the MIN/MAX column, and
+# one more nullable attribute
+
+create table t2 (
+  a1 char(64), a2 char(64) not null, b char(16), c char(16), d char(16), dummy char(64) default ' '
+);
+insert into t2 select * from t1;
+# add few rows with NULL's in the MIN/MAX column
+insert into t2 (a1, a2, b, c, d) values
+('a','a',NULL,'a777','xyz'),('a','a',NULL,'a888','xyz'),('a','a',NULL,'a999','xyz'),
+('a','a','a',NULL,'xyz'),
+('a','a','b',NULL,'xyz'),
+('a','b','a',NULL,'xyz'),
+('c','a',NULL,'c777','xyz'),('c','a',NULL,'c888','xyz'),('c','a',NULL,'c999','xyz'),
+('d','b','b',NULL,'xyz'),
+('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),
+('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),
+('a','a',NULL,'a777','xyz'),('a','a',NULL,'a888','xyz'),('a','a',NULL,'a999','xyz'),
+('a','a','a',NULL,'xyz'),
+('a','a','b',NULL,'xyz'),
+('a','b','a',NULL,'xyz'),
+('c','a',NULL,'c777','xyz'),('c','a',NULL,'c888','xyz'),('c','a',NULL,'c999','xyz'),
+('d','b','b',NULL,'xyz'),
+('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),('e','a','a',NULL,'xyz'),
+('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz'),('e','a','b',NULL,'xyz');
+
+create index idx_t2_0 on t2 (a1);
+create index idx_t2_1 on t2 (a1,a2,b,c);
+create index idx_t2_2 on t2 (a1,a2,b);
+analyze table t2;
+
+# Table t3 is the same as t1, but with smaller column lenghts.
+# This allows to test different branches of the cost computation procedure
+# when the number of keys per block are less than the number of keys in the
+# sub-groups formed by predicates over non-group attributes. 
+
+create table t3 (
+  a1 char(1), a2 char(1), b char(1), c char(4) not null, d char(3), dummy char(1) default ' '
+);
+
+insert into t3 (a1, a2, b, c, d) values
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
+insert into t3 (a1, a2, b, c, d) values
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
+insert into t3 (a1, a2, b, c, d) values
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
+insert into t3 (a1, a2, b, c, d) values
+('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
+('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
+('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
+('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
+('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
+('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
+('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
+('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
+('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
+('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
+('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
+('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4');
+
+create index idx_t3_0 on t3 (a1);
+create index idx_t3_1 on t3 (a1,a2,b,c);
+create index idx_t3_2 on t3 (a1,a2,b);
+analyze table t3;
+
+
+explain select a1,a2,b,c,min(c), max(c) from t1
+where exists ( select * from t2
+               where t2.c in (select c from t3 where t3.c > t1.b) and
+               t2.c > 'b1' )
+group by a1,a2,b;
+
+select a1,a2,b,c,min(c), max(c) from t1
+where exists ( select * from t2
+               where t2.c in (select c from t3 where t3.c > t1.b) and
+               t2.c > 'b1' )
+group by a1,a2,b;
+
+explain select a1,a2,b,c,min(c), max(c) from t1
+where exists ( select * from t2
+               where t2.c in (select c from t3 where t3.c > t1.c) and
+               t2.c > 'b1' )
+group by a1,a2,b;
+
+select a1,a2,b,c,min(c), max(c) from t1
+where exists ( select * from t2
+               where t2.c in (select c from t3 where t3.c > t1.c) and
+               t2.c > 'b1' )
+group by a1,a2,b;
+
+drop table t1, t2, t3;
+
+#
+# LP BUG#901835 - incorrect semi-join conversion after exists2in
+#
+CREATE TABLE t1 ( a INT );
+INSERT INTO t1 VALUES (7),(0);
+CREATE TABLE t2 ( b INT );
+INSERT INTO t2 VALUES (0),(8);
+
+SELECT * FROM t1 WHERE
+  EXISTS ( SELECT * FROM t2 WHERE b = a )
+  OR a > 0;
+
+explain extended
+SELECT * FROM t1 WHERE
+  EXISTS ( SELECT * FROM t2 WHERE b = a )
+  OR a > 0;
+
+drop tables t1,t2;
+
+#
+# NOT EXISTS test
+#
+CREATE TABLE t1 ( a INT );
+INSERT INTO t1 VALUES (1),(5);
+CREATE TABLE t2 ( b INT ) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (1);
+
+CREATE TABLE t3 ( c INT );
+INSERT INTO t3 VALUES (4),(5);
+
+SET optimizer_switch='exists_to_in=on,subquery_cache=off,materialization=on,in_to_exists=off,semijoin=off';
+
+explain extended
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+
+SET optimizer_switch='exists_to_in=on,subquery_cache=off';
+
+
+explain extended
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+
+SET optimizer_switch='exists_to_in=off,subquery_cache=off';
+
+explain extended
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+SELECT ( SELECT b FROM t2 WHERE NOT EXISTS ( SELECT c FROM t3 WHERE c = b ) ) FROM t1;
+
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+drop table t1,t2,t3;
+
+--echo # multi condition test
+CREATE TABLE t1 ( a varchar(1), a1 varchar(1)) ;
+INSERT INTO t1 VALUES ('c', 'c'), ('b', 'b');
+
+CREATE TABLE t3 ( a int NOT NULL , b varchar(1), b1 varchar(1)) ;
+INSERT INTO t3 VALUES (29,'c','c');
+INSERT INTO t3 VALUES (2,'c','c');
+alter table t1 add index aa (a,a1);
+alter table t3 add index bb (b,b1);
+--echo -- EXIST to IN then semijoin (has priority over IN to EXISTS)
+set optimizer_switch='exists_to_in=on,in_to_exists=on,semijoin=on,materialization=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+--echo -- EXIST to IN then IN to EXISTS
+set optimizer_switch='exists_to_in=on,in_to_exists=on,semijoin=off,materialization=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+--echo -- EXIST2IN then MATERIALIZATION
+set optimizer_switch='exists_to_in=on,in_to_exists=off,semijoin=off,materialization=on,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+--echo -- NO EXIST2IN
+set optimizer_switch='exists_to_in=off,subquery_cache=off';
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+explain extended
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t3 WHERE t3.b = t1.a and t3.b1 = t1.a1);
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+drop table t1,t3;
+
+--echo #
+--echo # MDEV-159 Assertion about not marked for read failed in
+--echo # String* Field_varstring::val_str(String*, String*)
+--echo #
+
+SET optimizer_switch = REPLACE( @@optimizer_switch, '=on', '=off' );
+SET optimizer_switch='in_to_exists=on,exists_to_in=on';
+
+CREATE TABLE t1 ( a VARCHAR(1) );
+INSERT INTO t1 VALUES ('k'),('m');
+
+CREATE TABLE t2 ( b INT,
+  c VARCHAR(1),
+  d VARCHAR(1) NOT NULL );
+		
+INSERT INTO t2 VALUES 
+  (4,'j','j'),(6,'v','v');
+
+CREATE ALGORITHM=MERGE VIEW v AS SELECT * FROM t2 WHERE b < 1;
+
+SELECT c FROM v  
+WHERE EXISTS ( 
+  SELECT * FROM t1, t2 
+  WHERE a <= v.d AND b = v.b 
+);
+
+explain extended
+SELECT c FROM v  
+WHERE EXISTS ( 
+  SELECT * FROM t1, t2 
+  WHERE a <= v.d AND b = v.b 
+);
+
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+drop view v;
+drop table t1,t2;
+
+
+--echo #
+--echo # MDEV-160 Exists2In: Crash in in hp_movelink with subquery_cache=ON
+--echo #
+
+SET optimizer_switch = 'in_to_exists=on,subquery_cache=on,exists_to_in=on';
+
+CREATE TABLE t1 (  
+  a VARCHAR(3) NOT NULL,  
+  b VARCHAR(50)
+);
+INSERT INTO t1 VALUES 
+ ('USA','Chinese'),('USA','English'),
+ ('FRA','French'),('ITA','Italian');
+
+CREATE TABLE t2 ( c VARCHAR(3) );
+INSERT INTO t2 VALUES ('USA'),('FRA');
+
+SELECT * FROM t1 AS alias1, t1 AS alias2 
+WHERE EXISTS ( 
+  SELECT * FROM t1, t2 
+  WHERE a <= alias2.a AND c = alias1.b 
+) OR alias1 .a = 'foo';
+
+SELECT * FROM t1 AS alias1, t1 AS alias2 
+WHERE EXISTS ( 
+  SELECT * FROM t1, t2 
+  WHERE a <= alias2.a AND c = alias1.a 
+) OR alias1 .a = 'foo';
+
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+--echo #
+--echo # MDEV-160 Exists2In: Crash in in hp_movelink with subquery_cache=ON
+--echo #
+SET optimizer_switch = 'in_to_exists=on,subquery_cache=on,exists_to_in=on';
+
+CREATE TABLE t1 (  
+  a VARCHAR(3) NOT NULL,  
+  b VARCHAR(50)
+);
+INSERT INTO t1 VALUES 
+ ('USA','Chinese'),('USA','English'),
+ ('FRA','French'),('ITA','Italian');
+
+CREATE TABLE t2 ( c VARCHAR(3) );
+INSERT INTO t2 VALUES ('USA'),('FRA');
+
+SELECT * FROM t1 AS alias1, t1 AS alias2 
+WHERE EXISTS ( 
+  SELECT * FROM t1, t2 
+  WHERE a <= alias2.a AND c = alias1.b 
+) OR alias1 .a = 'foo';
+
+explain extended
+SELECT * FROM t1 AS alias1, t1 AS alias2 
+WHERE EXISTS ( 
+  SELECT * FROM t1, t2 
+  WHERE a <= alias2.a AND c = alias1.b 
+) OR alias1 .a = 'foo';
+
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+--echo #
+--echo # MDEV-245 Exists2In: Wrong result (extra rows) with
+--echo # exists_to_in=ON, materialization=OFF, NOT EXISTS subquery
+--echo #
+SET optimizer_switch='materialization=off,exists_to_in=on';
+
+CREATE TABLE t1 ( a INT ) ;                                     
+INSERT INTO t1 VALUES (0),(8),(1);
+
+CREATE TABLE t2 ( b INT ) ;                    
+INSERT INTO t2 VALUES (1),(2),(3);
+
+SELECT * FROM t1 WHERE NOT EXISTS ( SELECT * FROM t2 WHERE b = a );
+explain extended
+SELECT * FROM t1 WHERE NOT EXISTS ( SELECT * FROM t2 WHERE b = a );
+
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+--echo #
+--echo # MDEV-243 Wrong result (extra or missing rows) with
+--echo # exists_to_in + materialization, EXISTS subquery
+--echo #
+
+SET optimizer_switch='index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off,exists_to_in=on';
+
+CREATE TABLE t1 ( a VARCHAR(1), b VARCHAR(1) );
+INSERT INTO t1 VALUES ('v','v'),('s','v');
+
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+explain extended
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+
+SET optimizer_switch = REPLACE( @@optimizer_switch, '=on', '=off' );
+SET optimizer_switch = 'exists_to_in=on,materialization=on,semijoin=off';
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+explain extended
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+SET optimizer_switch = 'exists_to_in=on,materialization=on,semijoin=on';
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+explain extended
+SELECT * FROM t1 AS alias
+WHERE EXISTS ( SELECT * FROM t1 WHERE a > alias.a AND a = alias.b );
+
+drop table t1;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+--echo #
+--echo # MDEV-403 Wrong result (missing rows) with subquery in
+--echo # EXISTS and an OR condition outside
+--echo #
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (2),(3);
+
+CREATE TABLE t2 (b INT);
+INSERT INTO t2 VALUES (1),(3);                   
+SET optimizer_switch = 'exists_to_in=off,in_to_exists=on';
+SELECT * FROM t1 AS alias1, t2 AS alias2 
+WHERE EXISTS ( 
+  SELECT 1 FROM t2 WHERE b = alias1.a AND b > alias2.b 
+) OR a = 5;
+
+SET optimizer_switch = 'exists_to_in=on,in_to_exists=on';
+
+SELECT * FROM t1 AS alias1, t2 AS alias2 
+WHERE EXISTS ( 
+  SELECT 1 FROM t2 WHERE b = alias1.a AND b > alias2.b 
+) OR a = 5;
+
+explain extended
+SELECT * FROM t1 AS alias1, t2 AS alias2 
+WHERE EXISTS ( 
+  SELECT 1 FROM t2 WHERE b = alias1.a AND b > alias2.b 
+) OR a = 5;
+
+drop table t1, t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+--echo #
+--echo # MDEV-404: Wrong result (extra rows) with STRAIGHT_JOIN,
+--echo # EXISTS subquery, NOT NULL column
+--echo # (same as above)
+--echo #
+SET optimizer_switch = 'exists_to_in=on,in_to_exists=on';
+
+CREATE TABLE t1 (a INT, b VARCHAR(1) NOT NULL);
+INSERT INTO t1 VALUES (1,'s'),(2,'e');
+
+SELECT STRAIGHT_JOIN * FROM t1 AS alias1, t1 AS alias2 
+WHERE EXISTS ( SELECT 1 FROM t1 WHERE b < alias2.b AND a = alias1.a );
+
+drop table t1;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+
+--echo #
+--echo # MDEV-3800: ORDER BY doesn't work with exists_to_in=ON on
+--echo # a query with EXISTS subquery and OR condition
+--echo #
+SET optimizer_switch = 'in_to_exists=on,exists_to_in=on';
+CREATE TABLE t1 (a INT, b VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (4,'j'),(6,'v'),(3,'c');
+
+CREATE TABLE t2 (c VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES ('b'),('y');
+
+SELECT a FROM t1
+WHERE EXISTS ( 
+	SELECT 1 FROM t2 WHERE c = b 
+) OR b NOT IN ('U')  
+ORDER BY a;
+
+select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`b` in (select `test`.`t2`.`c` from `test`.`t2` where 1 ) or (`test`.`t1`.`b` <> 'U') order by `test`.`t1`.`a`;
+
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+
+--echo #
+--echo # correct calculation of reserved items (postreview-fix)
+--echo #
+create table t1 (col1 int, col2 int, col3 int); 
+insert into t1 values (1,2,3),(2,3,4),(4,5,6);
+create table t2 as select * from t1;
+explain extended
+select * from t1 where exists (select col2 from t2 where t2.col1=t1.col1 and t2.col2=t1.col2);
+select * from t1 where exists (select col2 from t2 where t2.col1=t1.col1 and t2.col2=t1.col2);
+drop table t1,t2;
+
+--echo #
+--echo # MDEV-3879: Exists2In: Wrong result (extra row) and unexpected
+--echo # warning with exists_to_in=on and a NOT EXISTS subquery
+--echo #
+SET optimizer_switch = 'exists_to_in=on';
+
+CREATE TABLE t1 (a1 INT, b1 CHAR(1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (3,'y'),(6,'w');
+
+CREATE TABLE t2 (a2 INT, b2 CHAR(1)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (3,'y'),(6,'d');
+
+SELECT * FROM t1
+WHERE NOT EXISTS ( SELECT * FROM t2 WHERE b2 = b1 AND a2 = a1 );
+
+drop table t1, t2;
+
+--echo #
+--echo # MDEV-3880: Wrong result (missing rows) with exists_to_in=on,
+--echo # LEFT JOIN and NOT EXISTS subquery.
+--echo # (Duplicate of above MDEV-3879).
+--echo #
+
+SET optimizer_switch = 'exists_to_in=on';
+CREATE TABLE t1 (a1 INT, b1 CHAR(1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (4,'b'),(5,'y');
+
+CREATE TABLE t2 (b2 CHAR(1)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES ('z'),('b');
+
+CREATE TABLE t3 (a3 INT, b3 CHAR(1)) ENGINE=MyISAM;
+INSERT INTO t3 VALUES (4,'j'),(6,'v');
+
+SELECT * FROM t1 LEFT JOIN t2 ON ( b2 = b1 ) 
+WHERE NOT EXISTS ( SELECT * FROM t3 WHERE b3 = b2 AND a3 = a1 ) ;
+
+drop table t1, t2, t3;
+
+
+
+--echo #
+--echo # MDEV-3881: Endless loop and crash in Item_ref::real_item with
+--echo # exists_to_in=on, NOT EXISTS subquery, merge view or from subquery,
+--echo # constant table
+--echo #
+SET optimizer_switch = 'exists_to_in=on';
+
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(7);
+
+CREATE TABLE t2 (b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (8);
+CREATE ALGORITHM=MERGE VIEW v1 AS SELECT * FROM t2;
+
+CREATE TABLE t3 (c INT) ENGINE=MyISAM;
+INSERT INTO t3 VALUES (4),(6);
+
+SELECT * FROM t1, v1 WHERE NOT EXISTS ( SELECT * FROM t3 WHERE c = b ) AND a = b;
+
+drop view v1;
+drop table t1, t2, t3;
+
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(7);
+
+CREATE TABLE t2 (b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (8);
+
+CREATE TABLE t3 (c INT) ENGINE=MyISAM;
+INSERT INTO t3 VALUES (4),(6);
+
+SELECT * FROM t1, ( SELECT * FROM t2 ) alias WHERE NOT EXISTS ( SELECT * FROM t3 WHERE c = b ) AND a = b;
+
+drop table t1, t2, t3;
+
+--echo #
+--echo # MDEV-3906: Server crashes in Dependency_marker::visit_field
+--echo # on 2nd execution of PS with exists_to_in and NOT EXISTS subquery
+--echo #
+SET optimizer_switch='exists_to_in=on';
+
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(7);
+
+PREPARE stmt FROM ' 
+SELECT * FROM t1 AS alias 
+WHERE NOT EXISTS ( SELECT * FROM t1 WHERE t1.a = alias.a ) 
+';
+
+EXECUTE stmt;
+EXECUTE stmt;
+
+drop table t1;
+
+--echo #
+--echo # MDEV-3904: Assertion `in_subs->has_strategy()' failed in
+--echo # JOIN::choose_subquery_plan on 2nd execution of PS with
+--echo # exists_to_in+semijoin, EXISTS subquery, MERGE view or FROM subquery
+--echo #
+SET optimizer_switch='in_to_exists=on,semijoin=on,exists_to_in=on';
+
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(2);
+
+CREATE TABLE t2 (b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (4),(6);
+
+CREATE ALGORITHM=MERGE VIEW v AS 
+SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM t2 WHERE b = a );
+
+PREPARE stmt FROM ' SELECT * FROM v ';
+
+EXECUTE stmt;
+EXECUTE stmt;
+
+drop view v;
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+--echo #
+--echo # MDEV-3903: Server crashes in Item_cond::fix_fields on 2nd execution
+--echo # of a prepared stmt with exists_to_in+materialization+semijoin,
+--echo # EXISTS subquery, STRAIGHT_JOIN
+--echo #
+
+SET optimizer_switch='materialization=on,semijoin=on,exists_to_in=on';
+
+CREATE TABLE t1 (a INT) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(2);
+
+CREATE TABLE t2 (b INT) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (3),(4);
+
+PREPARE stmt FROM
+'SELECT STRAIGHT_JOIN * FROM t1
+WHERE EXISTS ( SELECT * FROM t2 WHERE b = a )';
+
+EXECUTE stmt;
+EXECUTE stmt;
+
+drop table t1,t2;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+--echo #
+--echo # MDEV-4152: Wrong result (missing rows) with exists_to_in=on, 
+--echo # inner joins
+--echo #
+SET optimizer_switch='materialization=on,semijoin=on,exists_to_in=on';
+
+CREATE TABLE t1 (i INT, c1 CHAR(5), c2 CHAR(5), t1_field VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1,'test1','test2','f'), (2,'test3','test4','d');
+
+CREATE TABLE t2 (t2_field VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t2 VALUES ('m'), ('b');
+
+CREATE TABLE t3 (t3_field VARCHAR(1)) ENGINE=MyISAM;
+INSERT INTO t3 VALUES ('b'),('c');
+
+SELECT * FROM t1, t2 outer_t2 
+WHERE EXISTS ( SELECT 1 FROM t2, t3 WHERE t3_field = outer_t2.t2_field AND t2_field <= t1_field );
+
+drop table t1,t2,t3;
+set optimizer_switch=default;
+set optimizer_switch='exists_to_in=on';
+
+#restore defaults
+set optimizer_switch=default;
diff --git a/mysql-test/t/subselect_exists2in_costmat.test b/mysql-test/t/subselect_exists2in_costmat.test
new file mode 100644
index 00000000000..5d5eeaee268
--- /dev/null
+++ b/mysql-test/t/subselect_exists2in_costmat.test
@@ -0,0 +1,83 @@
+#
+# Tests of cost-based choice between the materialization and in-to-exists
+# subquery execution strategies (MWL#89)
+#
+# The test file is divided into two groups of tests:
+# A. Typical cases when either of the two strategies is selected:
+#    1. Subquery in disjunctive WHERE clause of the outer query.
+#    2. NOT IN subqueries
+#    3. Subqueries with GROUP BY, HAVING, and aggregate functions
+#    4. Subqueries in the SELECT and HAVING clauses
+#    5. Subqueries with UNION
+# B. Reasonably exhaustive tests of the various combinations of optimizer
+#    switches, data distribution, available indexes, and typical queries.
+#
+
+set @subselect_mat_cost=@@optimizer_switch;
+set optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
+#
+# Test logging to slow log (there was some errors in the log files about
+# the slow log when running under valgrind, so better to get this tested)
+#
+set long_query_time=0.1;
+
+
+--disable_warnings
+drop database if exists world;
+--enable_warnings
+
+set names utf8;
+
+create database world;
+use world;
+
+--source include/world_schema.inc
+--disable_query_log
+--disable_result_log
+--disable_warnings
+--source include/world.inc
+--enable_warnings
+--enable_result_log
+--enable_query_log
+
+-- echo Make the schema and data more diverse by adding more indexes, nullable
+-- echo columns, and NULL data.
+create index SurfaceArea on Country(SurfaceArea);
+create index Language on CountryLanguage(Language);
+create index CityName on City(Name);
+alter table City change population population int(11) null default 0;
+
+select max(id) from City into @max_city_id;
+insert into City values (@max_city_id + 1,'Kilifarevo','BGR',NULL);
+
+
+SELECT COUNT(*) FROM Country;
+SELECT COUNT(*) FROM City;
+SELECT COUNT(*) FROM CountryLanguage;
+
+set @@optimizer_switch = 'exists_to_in=on,in_to_exists=on,semijoin=on,materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on';
+
+-- echo
+-- echo 1. Subquery in a disjunctive WHERE clause of the outer query.
+-- echo
+
+-- echo
+-- echo Q1.1m:
+-- echo MATERIALIZATION: there are too many rows in the outer query
+-- echo to be looked up in the inner table.
+EXPLAIN
+SELECT Name FROM Country
+WHERE (EXISTS (select 1 from City where City.Population > 100000 and
+Code = Country) OR
+       Name LIKE 'L%') AND
+      surfacearea > 1000000;
+
+SELECT Name FROM Country
+WHERE (EXISTS (select 1 from City where City.Population > 100000 and
+Code = Country) OR
+       Name LIKE 'L%') AND
+      surfacearea > 1000000;
+
+drop database world;
+
+set optimizer_switch=@subselect_mat_cost;
diff --git a/mysql-test/t/subselect_exists_to_in.test b/mysql-test/t/subselect_exists_to_in.test
new file mode 100644
index 00000000000..1b97aa13955
--- /dev/null
+++ b/mysql-test/t/subselect_exists_to_in.test
@@ -0,0 +1,11 @@
+# 
+# Run subselect.test with exists to in transformation
+#
+select @@optimizer_switch like '%exists_to_in=on%';
+set optimizer_switch='exists_to_in=on';
+
+--source t/subselect.test
+
+set optimizer_switch=default;
+select @@optimizer_switch like '%exists_to_in=on%';
+
diff --git a/sql/item.cc b/sql/item.cc
index 96f61c08982..9ef1593b0bf 100644
--- a/sql/item.cc
+++ b/sql/item.cc
@@ -807,10 +807,15 @@ bool Item_ident::remove_dependence_processor(uchar * arg)
 bool Item_ident::collect_outer_ref_processor(uchar *param)
 {
   Collect_deps_prm *prm= (Collect_deps_prm *)param;
-  if (depended_from && 
+  if (depended_from &&
       depended_from->nest_level_base == prm->nest_level_base &&
       depended_from->nest_level < prm->nest_level)
-    prm->parameters->add_unique(this, &cmp_items);
+  {
+    if (prm->collect)
+      prm->parameters->add_unique(this, &cmp_items);
+    else
+      prm->count++;
+  }
   return FALSE;
 }
 
@@ -6481,6 +6486,13 @@ Item* Item::cache_const_expr_transformer(uchar *arg)
   return this;
 }
 
+/**
+  Find Item by reference in the expression
+*/
+bool Item::find_item_processor(uchar *arg)
+{
+  return (this == ((Item *) arg));
+}
 
 bool Item_field::send(Protocol *protocol, String *buffer)
 {
diff --git a/sql/item.h b/sql/item.h
index 9b10cdf601b..db17b723071 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -553,6 +553,8 @@ class COND_EQUAL;
 
 class st_select_lex_unit;
 
+class Item_func_not;
+
 class Item {
   Item(const Item &);			/* Prevent use of these */
   void operator=(Item &);
@@ -1153,6 +1155,7 @@ public:
   virtual bool collect_item_field_processor(uchar * arg) { return 0; }
   virtual bool add_field_to_set_processor(uchar * arg) { return 0; }
   virtual bool find_item_in_field_list_processor(uchar *arg) { return 0; }
+  virtual bool find_item_processor(uchar *arg);
   virtual bool change_context_processor(uchar *context) { return 0; }
   virtual bool reset_query_id_processor(uchar *query_id_arg) { return 0; }
   virtual bool is_expensive_processor(uchar *arg) { return 0; }
@@ -1167,9 +1170,10 @@ public:
   virtual bool eval_not_null_tables(uchar *opt_arg) { return 0; }
   virtual bool is_subquery_processor (uchar *opt_arg) { return 0; }
   virtual bool limit_index_condition_pushdown_processor(uchar *opt_arg)
-  { 
+  {
     return FALSE;
   }
+  virtual bool exists2in_processor(uchar *opt_arg) { return 0; }
 
   /* To call bool function for all arguments */
   struct bool_func_call_args
@@ -1186,6 +1190,7 @@ public:
     return FALSE;
   }
 
+
   /*
     The next function differs from the previous one that a bitmap to be updated
     is passed as uchar *arg.
@@ -1315,7 +1320,9 @@ public:
     List<Item> *parameters;
     /* unit from which we count nest_level */
     st_select_lex_unit *nest_level_base;
+    uint count;
     int nest_level;
+    bool collect;
   };
   /**
     Collect outer references
@@ -1478,6 +1485,15 @@ public:
   virtual void get_cache_parameters(List<Item> &parameters) { };
 
   virtual void mark_as_condition_AND_part(TABLE_LIST *embedding) {};
+
+  /* how much position should be reserved for Exists2In transformation */
+  virtual uint exists2in_reserved_items() { return 0; };
+
+  /**
+    Inform the item that it is located under a NOT, which is a top-level item.
+  */
+  virtual void under_not(Item_func_not * upper
+                         __attribute__((unused))) {};
 };
 
 
@@ -2983,6 +2999,13 @@ public:
               alias_name_used_arg)
   {}
 
+  bool fix_fields(THD *thd, Item **it)
+  {
+    if ((!(*ref)->fixed && (*ref)->fix_fields(thd, ref)) ||
+        (*ref)->check_cols(1))
+      return TRUE;
+    return Item_ref::fix_fields(thd, it);
+  }
   void save_val(Field *to);
   double val_real();
   longlong val_int();
@@ -3202,7 +3225,7 @@ public:
   bool subst_argument_checker(uchar **arg);
   Item *equal_fields_propagator(uchar *arg);
   Item *replace_equal_field(uchar *arg);
-  table_map used_tables() const;	
+  table_map used_tables() const;
   table_map not_null_tables() const;
   void update_used_tables();
   bool walk(Item_processor processor, bool walk_subquery, uchar *arg)
diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc
index 3b09da68927..b1208243e6b 100644
--- a/sql/item_cmpfunc.cc
+++ b/sql/item_cmpfunc.cc
@@ -1434,7 +1434,7 @@ bool Item_in_optimizer::eval_not_null_tables(uchar *opt_arg)
   return FALSE;
 }
 
-bool Item_in_optimizer::fix_left(THD *thd, Item **ref)
+bool Item_in_optimizer::fix_left(THD *thd)
 {
   if ((!args[0]->fixed && args[0]->fix_fields(thd, args)) ||
       (!cache && !(cache= Item_cache::get_cache(args[0]))))
@@ -1482,6 +1482,13 @@ bool Item_in_optimizer::fix_left(THD *thd, Item **ref)
     cache->store(args[0]);
     cache->cache_value();
   }
+  if (args[1]->fixed)
+  {
+    /* to avoid overriding is called to update left expression */
+    used_tables_cache|= args[1]->used_tables();
+    with_sum_func= with_sum_func || args[1]->with_sum_func;
+    const_item_cache= const_item_cache && args[1]->const_item();
+  }
   return 0;
 }
 
@@ -1489,15 +1496,17 @@ bool Item_in_optimizer::fix_left(THD *thd, Item **ref)
 bool Item_in_optimizer::fix_fields(THD *thd, Item **ref)
 {
   DBUG_ASSERT(fixed == 0);
-  if (fix_left(thd, ref))
+  if (fix_left(thd))
     return TRUE;
   if (args[0]->maybe_null)
     maybe_null=1;
 
   if (!args[1]->fixed && args[1]->fix_fields(thd, args+1))
     return TRUE;
+
   Item_in_subselect * sub= (Item_in_subselect *)args[1];
-  if (args[0]->cols() != sub->engine->cols())
+  if (!invisible_mode() &&
+      args[0]->cols() != sub->engine->cols())
   {
     my_error(ER_OPERAND_COLUMNS, MYF(0), args[0]->cols());
     return TRUE;
@@ -1513,6 +1522,30 @@ bool Item_in_optimizer::fix_fields(THD *thd, Item **ref)
   return FALSE;
 }
 
+/**
+  Check if Item_in_optimizer should work as a pass-through item for its 
+  arguments.
+
+  @note 
+   Item_in_optimizer should work as pass-through for
+    - subqueries that were processed by ALL/ANY->MIN/MAX rewrite
+    - subqueries taht were originally EXISTS subqueries (and were coverted by
+      the EXISTS->IN rewrite)
+
+   When Item_in_optimizer is not not working as a pass-through, it
+    - caches its "left argument", args[0].
+    - makes adjustments to subquery item's return value for proper NULL
+      value handling
+*/
+
+bool Item_in_optimizer::invisible_mode()
+{
+  /* MAX/MIN transformed or EXISTS->IN prepared => do nothing */
+ return (args[1]->type() != Item::SUBSELECT_ITEM ||
+         ((Item_subselect *)args[1])->substype() ==
+         Item_subselect::EXISTS_SUBS);
+}
+
 
 /**
   Add an expression cache for this subquery if it is needed
@@ -1536,8 +1569,9 @@ Item *Item_in_optimizer::expr_cache_insert_transformer(uchar *thd_arg)
 {
   THD *thd= (THD*) thd_arg;
   DBUG_ENTER("Item_in_optimizer::expr_cache_insert_transformer");
-  if (args[1]->type() != Item::SUBSELECT_ITEM)
-    DBUG_RETURN(this); // MAX/MIN transformed => do nothing
+
+  if (invisible_mode())
+    DBUG_RETURN(this);
 
   if (expr_cache)
     DBUG_RETURN(expr_cache);
@@ -1560,13 +1594,16 @@ Item *Item_in_optimizer::expr_cache_insert_transformer(uchar *thd_arg)
 void Item_in_optimizer::get_cache_parameters(List<Item> &parameters)
 {
   /* Add left expression to the list of the parameters of the subquery */
-  if (args[0]->cols() == 1)
-    parameters.add_unique(args[0], &cmp_items);
-  else
+  if (!invisible_mode())
   {
-    for (uint i= 0; i < args[0]->cols(); i++)
+    if (args[0]->cols() == 1)
+      parameters.add_unique(args[0], &cmp_items);
+    else
     {
-      parameters.add_unique(args[0]->element_index(i), &cmp_items);
+      for (uint i= 0; i < args[0]->cols(); i++)
+      {
+        parameters.add_unique(args[0]->element_index(i), &cmp_items);
+      }
     }
   }
   args[1]->get_cache_parameters(parameters);
@@ -1649,17 +1686,19 @@ longlong Item_in_optimizer::val_int()
   DBUG_ASSERT(fixed == 1);
   cache->store(args[0]);
   cache->cache_value();
+  DBUG_ENTER(" Item_in_optimizer::val_int");
 
-  if (args[1]->type() != Item::SUBSELECT_ITEM)
+  if (invisible_mode())
   {
-    /* MAX/MIN transformed => pass through */
     longlong res= args[1]->val_int();
     null_value= args[1]->null_value;
-    return (res);
+    DBUG_PRINT("info", ("pass trough"));
+    DBUG_RETURN(res);
   }
 
   if (cache->null_value)
   {
+     DBUG_PRINT("info", ("Left NULL..."));
     /*
       We're evaluating 
       "<outer_value_list> [NOT] IN (SELECT <inner_value_list>...)" 
@@ -1731,11 +1770,11 @@ longlong Item_in_optimizer::val_int()
       for (uint i= 0; i < ncols; i++)
         item_subs->set_cond_guard_var(i, TRUE);
     }
-    return 0;
+    DBUG_RETURN(0);
   }
   tmp= args[1]->val_bool_result();
   null_value= args[1]->null_value;
-  return tmp;
+  DBUG_RETURN(tmp);
 }
 
 
@@ -1786,7 +1825,8 @@ bool Item_in_optimizer::is_null()
     @retval NULL if an error occurred
 */
 
-Item *Item_in_optimizer::transform(Item_transformer transformer, uchar *argument)
+Item *Item_in_optimizer::transform(Item_transformer transformer,
+                                   uchar *argument)
 {
   Item *new_item;
 
@@ -1806,7 +1846,7 @@ Item *Item_in_optimizer::transform(Item_transformer transformer, uchar *argument
   if ((*args) != new_item)
     current_thd->change_item_tree(args, new_item);
 
-  if (args[1]->type() != Item::SUBSELECT_ITEM)
+  if (invisible_mode())
   {
     /* MAX/MIN transformed => pass through */
     new_item= args[1]->transform(transformer, argument);
@@ -5350,6 +5390,7 @@ Item *Item_func_not::neg_transformer(THD *thd)	/* NOT(x)  ->  x */
 
 bool Item_func_not::fix_fields(THD *thd, Item **ref)
 {
+  args[0]->under_not(this);
   if (args[0]->type() == FIELD_ITEM)
   {
     /* replace  "NOT <field>" with "<filed> == 0" */
diff --git a/sql/item_cmpfunc.h b/sql/item_cmpfunc.h
index afb7bf005bb..5a5f9ad60fd 100644
--- a/sql/item_cmpfunc.h
+++ b/sql/item_cmpfunc.h
@@ -246,12 +246,12 @@ protected:
   */
   int result_for_null_param;
 public:
-  Item_in_optimizer(Item *a, Item_in_subselect *b):
-    Item_bool_func(a, reinterpret_cast<Item *>(b)), cache(0), expr_cache(0),
+  Item_in_optimizer(Item *a, Item *b):
+    Item_bool_func(a, b), cache(0), expr_cache(0),
     save_cache(0), result_for_null_param(UNKNOWN)
   { with_subselect= true; }
   bool fix_fields(THD *, Item **);
-  bool fix_left(THD *thd, Item **ref);
+  bool fix_left(THD *thd);
   table_map not_null_tables() const { return 0; }
   bool is_null();
   longlong val_int();
@@ -269,6 +269,8 @@ public:
   bool is_top_level_item();
   bool eval_not_null_tables(uchar *opt_arg);
   void fix_after_pullout(st_select_lex *new_parent, Item **ref);
+  bool invisible_mode();
+  void reset_cache() { cache= NULL; }
 };
 
 class Comp_creator
@@ -436,8 +438,11 @@ public:
 
 class Item_func_not :public Item_bool_func
 {
+  bool abort_on_null;
 public:
-  Item_func_not(Item *a) :Item_bool_func(a) {}
+  Item_func_not(Item *a) :Item_bool_func(a), abort_on_null(FALSE) {}
+  virtual void top_level_item() { abort_on_null= 1; }
+  bool is_top_level_item() { return abort_on_null; }
   longlong val_int();
   enum Functype functype() const { return NOT_FUNC; }
   const char *func_name() const { return "not"; }
@@ -495,16 +500,13 @@ class Item_func_not_all :public Item_func_not
   Item_sum_hybrid *test_sum_item;
   Item_maxmin_subselect *test_sub_item;
 
-  bool abort_on_null;
 public:
   bool show;
 
   Item_func_not_all(Item *a)
-    :Item_func_not(a), test_sum_item(0), test_sub_item(0), abort_on_null(0),
+    :Item_func_not(a), test_sum_item(0), test_sub_item(0),
      show(0)
     {}
-  virtual void top_level_item() { abort_on_null= 1; }
-  bool is_top_level_item() { return abort_on_null; }
   table_map not_null_tables() const { return 0; }
   longlong val_int();
   enum Functype functype() const { return NOT_ALL_FUNC; }
@@ -550,6 +552,7 @@ public:
     - Otherwise, UINT_MAX
   */
   uint in_equality_no;
+  virtual uint exists2in_reserved_items() { return 1; };
 };
 
 class Item_func_equal :public Item_bool_rowready_func2
@@ -1851,6 +1854,7 @@ public:
   }
   Item *neg_transformer(THD *thd);
   void mark_as_condition_AND_part(TABLE_LIST *embedding);
+  virtual uint exists2in_reserved_items() { return list.elements; };
 };
 
 inline bool is_cond_and(Item *item)
diff --git a/sql/item_row.cc b/sql/item_row.cc
index ee7bd837553..03b460e3ada 100644
--- a/sql/item_row.cc
+++ b/sql/item_row.cc
@@ -47,13 +47,13 @@ Item_row::Item_row(List<Item> &arg):
     items= (Item**) sql_alloc(sizeof(Item*)*arg_count);
   else
     items= 0;
-  List_iterator<Item> li(arg);
+  List_iterator_fast<Item> li(arg);
   uint i= 0;
   Item *item;
   while ((item= li++))
   {
     items[i]= item;
-    i++;    
+    i++;
   }
 }
 
diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc
index bcd3b881934..48de0c4bc5c 100644
--- a/sql/item_strfunc.cc
+++ b/sql/item_strfunc.cc
@@ -2489,10 +2489,12 @@ void Item_func_make_set::fix_length_and_dec()
 
 void Item_func_make_set::update_used_tables()
 {
+  DBUG_ENTER("Item_func_make_set::update_used_tables");
   Item_func::update_used_tables();
   item->update_used_tables();
   used_tables_cache|=item->used_tables();
   const_item_cache&=item->const_item();
+  DBUG_VOID_RETURN;
 }
 
 
diff --git a/sql/item_subselect.cc b/sql/item_subselect.cc
index 0bde4a7926f..c2273721805 100644
--- a/sql/item_subselect.cc
+++ b/sql/item_subselect.cc
@@ -43,6 +43,9 @@
 
 double get_post_group_estimate(JOIN* join, double join_op_rows);
 
+const char *exists_outer_expr_name= "<exists outer expr>";
+
+int check_and_do_in_subquery_rewrites(JOIN *join);
 
 Item_subselect::Item_subselect():
   Item_result_field(), value_assigned(0), own_engine(0), thd(0), old_engine(0), 
@@ -83,15 +86,24 @@ void Item_subselect::init(st_select_lex *select_lex,
 
   if (unit->item)
   {
-    /*
-      Item can be changed in JOIN::prepare while engine in JOIN::optimize
-      => we do not copy old_engine here
-    */
     engine= unit->item->engine;
-    own_engine= FALSE;
     parsing_place= unit->item->parsing_place;
-    thd->change_item_tree((Item**)&unit->item, this);
-    engine->change_result(this, result, TRUE);
+    if (unit->item->substype() == EXISTS_SUBS &&
+        ((Item_exists_subselect *)unit->item)->exists_transformed)
+    {
+      /* it is permanent transformation of EXISTS to IN */
+      unit->item= this;
+      engine->change_result(this, result, FALSE);
+    }
+    else
+    {
+      /*
+        Item can be changed in JOIN::prepare while engine in JOIN::optimize
+        => we do not copy old_engine here
+      */
+      thd->change_item_tree((Item**)&unit->item, this);
+      engine->change_result(this, result, TRUE);
+    }
   }
   else
   {
@@ -462,7 +474,7 @@ public:
 void Item_subselect::recalc_used_tables(st_select_lex *new_parent, 
                                         bool after_pullout)
 {
-  List_iterator<Ref_to_outside> it(upper_refs);
+  List_iterator_fast<Ref_to_outside> it(upper_refs);
   Ref_to_outside *upper;
   
   used_tables_cache= 0;
@@ -661,9 +673,12 @@ bool Item_subselect::exec()
 
 void Item_subselect::get_cache_parameters(List<Item> &parameters)
 {
-  Collect_deps_prm prm= {&parameters,
-    unit->first_select()->nest_level_base,
-    unit->first_select()->nest_level};
+  Collect_deps_prm prm= {&parameters,      // parameters
+    unit->first_select()->nest_level_base, // nest_level_base
+    0,                                     // count
+    unit->first_select()->nest_level,      // nest_level
+    TRUE                                   // collect
+  };
   walk(&Item::collect_outer_ref_processor, TRUE, (uchar*)&prm);
 }
 
@@ -1298,10 +1313,12 @@ bool Item_singlerow_subselect::get_date(MYSQL_TIME *ltime,ulonglong fuzzydate)
 
 
 Item_exists_subselect::Item_exists_subselect(st_select_lex *select_lex):
-  Item_subselect()
+  Item_subselect(), upper_not(NULL), abort_on_null(0),
+  emb_on_expr_nest(NULL), optimizer(0), exists_transformed(0)
 {
   DBUG_ENTER("Item_exists_subselect::Item_exists_subselect");
   bool val_bool();
+
   init(select_lex, new select_exists_subselect(this));
   max_columns= UINT_MAX;
   null_value= FALSE; //can't be NULL
@@ -1335,21 +1352,19 @@ bool Item_in_subselect::test_limit(st_select_lex_unit *unit_arg)
 
 Item_in_subselect::Item_in_subselect(Item * left_exp,
 				     st_select_lex *select_lex):
-  Item_exists_subselect(), 
-  left_expr_cache(0), first_execution(TRUE), in_strategy(SUBS_NOT_TRANSFORMED),
-  optimizer(0), pushed_cond_guards(NULL), emb_on_expr_nest(NULL),
-  is_jtbm_merged(FALSE), is_jtbm_const_tab(FALSE), 
-  is_flattenable_semijoin(FALSE),
-  is_registered_semijoin(FALSE), 
+  Item_exists_subselect(), left_expr_cache(0), first_execution(TRUE),
+  in_strategy(SUBS_NOT_TRANSFORMED),
+  pushed_cond_guards(NULL), is_jtbm_merged(FALSE), is_jtbm_const_tab(FALSE),
+  is_flattenable_semijoin(FALSE), is_registered_semijoin(FALSE),
   upper_item(0)
 {
   DBUG_ENTER("Item_in_subselect::Item_in_subselect");
+  DBUG_PRINT("info", ("in_strategy: %u", (uint)in_strategy));
   left_expr= left_exp;
   func= &eq_creator;
   init(select_lex, new select_exists_subselect(this));
   max_columns= UINT_MAX;
   maybe_null= 1;
-  abort_on_null= 0;
   reset();
   //if test_limit will fail then error will be reported to client
   test_limit(select_lex->master_unit());
@@ -1745,8 +1760,7 @@ Item_in_subselect::single_value_transformer(JOIN *join)
     SELECT_LEX *current= thd->lex->current_select;
 
     thd->lex->current_select= current->return_after_parsing();
-    //optimizer never use Item **ref => we can pass 0 as parameter
-    if (!optimizer || optimizer->fix_left(thd, 0))
+    if (!optimizer || optimizer->fix_left(thd))
     {
       thd->lex->current_select= current;
       DBUG_RETURN(true);
@@ -2125,8 +2139,7 @@ Item_in_subselect::row_value_transformer(JOIN *join)
 
     SELECT_LEX *current= thd->lex->current_select;
     thd->lex->current_select= current->return_after_parsing();
-    //optimizer never use Item **ref => we can pass 0 as parameter
-    if (!optimizer || optimizer->fix_left(thd, 0))
+    if (!optimizer || optimizer->fix_left(thd))
     {
       thd->lex->current_select= current;
       DBUG_RETURN(true);
@@ -2370,6 +2383,12 @@ Item_in_subselect::select_transformer(JOIN *join)
   return select_in_like_transformer(join);
 }
 
+bool
+Item_exists_subselect::select_transformer(JOIN *join)
+{
+  return select_prepare_to_be_in();
+}
+
 
 /**
   Create the predicates needed to transform an IN/ALL/ANY subselect into a
@@ -2505,6 +2524,437 @@ bool Item_in_subselect::inject_in_to_exists_cond(JOIN *join_arg)
 }
 
 
+/*
+  If this select can potentially be converted by EXISTS->IN conversion, wrap it
+  in an Item_in_optimizer object. Final decision whether to do the conversion
+  is done at a later phase.
+*/
+
+bool Item_exists_subselect::select_prepare_to_be_in()
+{
+  bool trans_res= FALSE;
+  DBUG_ENTER("Item_exists_subselect::select_prepare_to_be_in");
+  if (!optimizer &&
+      thd->lex->sql_command == SQLCOM_SELECT &&
+      !unit->first_select()->is_part_of_union() &&
+      optimizer_flag(thd, OPTIMIZER_SWITCH_EXISTS_TO_IN) &&
+      (is_top_level_item() ||
+       (upper_not && upper_not->is_top_level_item())))
+  {
+    Query_arena *arena, backup;
+    bool result;
+    arena= thd->activate_stmt_arena_if_needed(&backup);
+    result= (!(optimizer= new Item_in_optimizer(new Item_int(1), this)));
+    if (arena)
+      thd->restore_active_arena(arena, &backup);
+    if (result)
+      trans_res= TRUE;
+    else
+      substitution= optimizer;
+  }
+  DBUG_RETURN(trans_res);
+}
+
+/**
+  Check if 'func' is an equality in form "inner_table.column = outer_expr"
+
+  @param func              Expression to check
+  @param local_field  OUT  Return "inner_table.column" here
+  @param outer_expr   OUT  Return outer_expr here
+
+  @return true - 'func' is an Equality.
+*/
+
+static bool check_equality_for_exist2in(Item_func *func,
+                                        Item_ident **local_field,
+                                        Item **outer_exp)
+{
+  Item **args;
+  if (func->functype() != Item_func::EQ_FUNC)
+    return FALSE;
+  DBUG_ASSERT(func->arg_count == 2);
+  args= func->arguments();
+  if (args[0]->real_type() == Item::FIELD_ITEM &&
+      args[0]->all_used_tables() != OUTER_REF_TABLE_BIT &&
+      args[1]->all_used_tables() == OUTER_REF_TABLE_BIT)
+  {
+    /* It is Item_field or Item_direct_view_ref) */
+    DBUG_ASSERT(args[0]->type() == Item::FIELD_ITEM ||
+                args[0]->type() == Item::REF_ITEM);
+    *local_field= (Item_ident *)args[0];
+    *outer_exp= args[1];
+    return TRUE;
+  }
+  else if (args[1]->real_type() == Item::FIELD_ITEM &&
+           args[1]->all_used_tables() != OUTER_REF_TABLE_BIT &&
+           args[0]->all_used_tables() == OUTER_REF_TABLE_BIT)
+  {
+    /* It is Item_field or Item_direct_view_ref) */
+    DBUG_ASSERT(args[0]->type() == Item::FIELD_ITEM ||
+                args[0]->type() == Item::REF_ITEM);
+    *local_field= (Item_ident *)args[1];
+    *outer_exp= args[0];
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+typedef struct st_eq_field_outer
+{
+  Item_func **eq_ref;
+  Item_ident *local_field;
+  Item *outer_exp;
+} EQ_FIELD_OUTER;
+
+
+/**
+  Check if 'conds' is a set of AND-ed outer_expr=inner_table.col equalities
+
+  @detail
+    Check if 'conds' has form
+
+    outer1=inner_tbl1.col1 AND ... AND outer2=inner_tbl1.col2 AND remainder_cond
+
+  @param  conds    Condition to be checked
+  @parm   result   Array to collect EQ_FIELD_OUTER elements describing
+                   inner-vs-outer equalities the function has found.
+  @return
+    false - some inner-vs-outer equalities were found
+    true  - otherwise.
+*/
+
+static bool find_inner_outer_equalities(Item **conds,
+                                        Dynamic_array<EQ_FIELD_OUTER> &result)
+{
+  bool found=  FALSE;
+  EQ_FIELD_OUTER element;
+  if (is_cond_and(*conds))
+  {
+    List_iterator<Item> li(*((Item_cond*)*conds)->argument_list());
+    Item *item;
+    while ((item= li++))
+    {
+      if (item->type() == Item::FUNC_ITEM &&
+          check_equality_for_exist2in((Item_func *)item,
+                                      &element.local_field,
+                                      &element.outer_exp))
+      {
+        found= TRUE;
+        element.eq_ref= (Item_func **)li.ref();
+        if (result.append(element))
+          goto alloc_err;
+      }
+    }
+  }
+  else if ((*conds)->type() == Item::FUNC_ITEM &&
+           check_equality_for_exist2in((Item_func *)*conds,
+                                       &element.local_field,
+                                       &element.outer_exp))
+  {
+    found= TRUE;
+    element.eq_ref= (Item_func **)conds;
+    if (result.append(element))
+      goto alloc_err;
+  }
+
+  return !found;
+alloc_err:
+  return TRUE;
+}
+
+/**
+  Converts EXISTS subquery to IN subquery if it is possible and has sense
+
+  @param opt_arg         Pointer on THD
+
+  @return TRUE in case of error and FALSE otherwise.
+*/
+
+bool Item_exists_subselect::exists2in_processor(uchar *opt_arg)
+{
+  THD *thd= (THD *)opt_arg;
+  SELECT_LEX *first_select=unit->first_select(), *save_select;
+  JOIN *join= first_select->join;
+  Item_func *eq= NULL, **eq_ref= NULL;
+  Item_ident *local_field= NULL;
+  Item *outer_exp= NULL;
+  Item *left_exp= NULL; Item_in_subselect *in_subs;
+  Query_arena *arena= NULL, backup;
+  int res= FALSE;
+  List<Item> outer;
+  Dynamic_array<EQ_FIELD_OUTER> eqs(5, 5);
+  bool will_be_correlated;
+  DBUG_ENTER("Item_exists_subselect::exists2in_processor");
+
+  if (!optimizer ||
+      !optimizer_flag(thd, OPTIMIZER_SWITCH_EXISTS_TO_IN) ||
+      (!is_top_level_item() && (!upper_not ||
+                                !upper_not->is_top_level_item())) ||
+      first_select->is_part_of_union() ||
+      first_select->group_list.elements ||
+      first_select->order_list.elements ||
+      join->having ||
+      first_select->with_sum_func ||
+      !first_select->leaf_tables.elements||
+      !join->conds)
+    DBUG_RETURN(FALSE);
+
+  DBUG_ASSERT(first_select->order_list.elements == 0 &&
+              first_select->group_list.elements == 0 &&
+              first_select->having == NULL);
+
+  if (find_inner_outer_equalities(&join->conds, eqs))
+    DBUG_RETURN(FALSE);
+
+  DBUG_ASSERT(eqs.elements() != 0);
+
+  save_select= thd->lex->current_select;
+  thd->lex->current_select= first_select;
+
+  /* check that the subquery has only dependencies we are going pull out */
+  {
+    List<Item> unused;
+    Collect_deps_prm prm= {&unused,          // parameters
+      unit->first_select()->nest_level_base, // nest_level_base
+      0,                                     // count
+      unit->first_select()->nest_level,      // nest_level
+      FALSE                                  // collect
+    };
+    walk(&Item::collect_outer_ref_processor, TRUE, (uchar*)&prm);
+    DBUG_ASSERT(prm.count > 0);
+    DBUG_ASSERT(prm.count >= (uint)eqs.elements());
+    will_be_correlated= prm.count > (uint)eqs.elements();
+    if (upper_not && will_be_correlated)
+      goto out;
+  }
+
+  if ((uint)eqs.elements() > (first_select->item_list.elements +
+                              first_select->select_n_reserved))
+    goto out;
+  /* It is simple query */
+  DBUG_ASSERT(first_select->join->all_fields.elements ==
+              first_select->item_list.elements);
+
+  arena= thd->activate_stmt_arena_if_needed(&backup);
+
+  while (first_select->item_list.elements > (uint)eqs.elements())
+  {
+    first_select->item_list.pop();
+    first_select->join->all_fields.elements--;
+  }
+  {
+    List_iterator<Item> it(first_select->item_list);
+
+    for (uint i= 0; i < (uint)eqs.elements(); i++)
+    {
+      Item *item= it++;
+      eq_ref= eqs.at(i).eq_ref;
+      eq= *eq_ref;
+      local_field= eqs.at(i).local_field;
+      outer_exp= eqs.at(i).outer_exp;
+      /* Add the field to the SELECT_LIST */
+      if (item)
+        it.replace(local_field);
+      else
+      {
+        first_select->item_list.push_back(local_field);
+        first_select->join->all_fields.elements++;
+      }
+      first_select->ref_pointer_array[i]= (Item *)local_field;
+
+      /* remove the parts from condition */
+      if (!upper_not || !local_field->maybe_null)
+      {
+        eq->arguments()[0]= new Item_int(1);
+        eq->arguments()[1]= new Item_int(1);
+      }
+      else
+      {
+        *eq_ref= new Item_func_isnotnull(
+          new Item_field(thd,
+                         ((Item_field*)(local_field->real_item()))->context,
+                         ((Item_field*)(local_field->real_item()))->field));
+        if((*eq_ref)->fix_fields(thd, (Item **)eq_ref))
+        {
+          res= TRUE;
+          goto out;
+        }
+      }
+      outer_exp->fix_after_pullout(unit->outer_select(), &outer_exp);
+      outer_exp->update_used_tables();
+      outer.push_back(outer_exp);
+    }
+  }
+
+  join->conds->update_used_tables();
+
+  /* make IN SUBQUERY and put outer_exp as left part */
+  if (eqs.elements() == 1)
+    left_exp= outer_exp;
+  else
+  {
+    if (!(left_exp= new Item_row(outer)))
+    {
+      res= TRUE;
+      goto out;
+    }
+  }
+
+  /* make EXISTS->IN permanet (see Item_subselect::init()) */
+  set_exists_transformed();
+
+  first_select->select_limit= NULL;
+  if (!(in_subs= new Item_in_subselect(left_exp, first_select)))
+  {
+    res= TRUE;
+    goto out;
+  }
+  in_subs->set_exists_transformed();
+  optimizer->arguments()[0]= left_exp;
+  optimizer->arguments()[1]= in_subs;
+  in_subs->optimizer= optimizer;
+  DBUG_ASSERT(is_top_level_item() ||
+              (upper_not && upper_not->is_top_level_item()));
+  in_subs->top_level_item();
+  {
+    SELECT_LEX *current= thd->lex->current_select;
+    optimizer->reset_cache(); // renew cache, and we will not keep it
+    thd->lex->current_select= unit->outer_select();
+    DBUG_ASSERT(optimizer);
+    if (optimizer->fix_left(thd))
+    {
+      res= TRUE;
+      /*
+        We should not restore thd->lex->current_select because it will be
+        reset on exit from this procedure
+      */
+      goto out;
+    }
+    /*
+      As far as  Item_ref_in_optimizer do not substitute itself on fix_fields
+      we can use same item for all selects.
+    */
+    in_subs->expr= new Item_direct_ref(&first_select->context,
+                                       (Item**)optimizer->get_cache(),
+                                       (char *)"<no matter>",
+                                       (char *)in_left_expr_name);
+    if (in_subs->fix_fields(thd, optimizer->arguments() + 1))
+    {
+      res= TRUE;
+      /*
+        We should not restore thd->lex->current_select because it will be
+        reset on exit from this procedure
+      */
+      goto out;
+    }
+    {
+      /* Move dependence list */
+      List_iterator_fast<Ref_to_outside> it(upper_refs);
+      Ref_to_outside *upper;
+      while ((upper= it++))
+      {
+        uint i;
+        for (i= 0; i < (uint)eqs.elements(); i++)
+          if (eqs.at(i).outer_exp->
+              walk(&Item::find_item_processor, TRUE, (uchar*)upper->item))
+            break;
+        if (i == (uint)eqs.elements() &&
+            (in_subs->upper_refs.push_back(upper, thd->stmt_arena->mem_root)))
+          goto out;
+      }
+    }
+    in_subs->update_used_tables();
+    /*
+      The engine of the subquery is fixed so above fix_fields() is not
+      complete and should be fixed
+    */
+    in_subs->upper_refs= upper_refs;
+    upper_refs.empty();
+    thd->lex->current_select= current;
+  }
+
+  DBUG_ASSERT(unit->item == in_subs);
+  DBUG_ASSERT(join == first_select->join);
+  /*
+    Fix dependency info
+  */
+  in_subs->is_correlated= will_be_correlated;
+  if (!will_be_correlated)
+  {
+    first_select->uncacheable&= ~UNCACHEABLE_DEPENDENT_GENERATED;
+    unit->uncacheable&= ~UNCACHEABLE_DEPENDENT_GENERATED;
+  }
+  /*
+    set possible optimization strategies
+  */
+  in_subs->emb_on_expr_nest= emb_on_expr_nest;
+  res= check_and_do_in_subquery_rewrites(join);
+  first_select->join->prepare_stage2();
+
+  first_select->fix_prepare_information(thd, &join->conds, &join->having);
+
+  if (upper_not)
+  {
+    Item *exp;
+    if (eqs.elements() == 1)
+    {
+      exp= (optimizer->arguments()[0]->maybe_null ?
+            (Item*)
+            new Item_cond_and(
+              new Item_func_isnotnull(
+                new Item_direct_ref(&unit->outer_select()->context,
+                                    optimizer->arguments(),
+                                    (char *)"<no matter>",
+                                    (char *)exists_outer_expr_name)),
+              optimizer) :
+            (Item *)optimizer);
+    }
+    else
+    {
+      List<Item> *and_list= new List<Item>;
+      if (!and_list)
+      {
+        res= TRUE;
+        goto out;
+      }
+      for (int i= 0; i < eqs.elements(); i++)
+      {
+        if (optimizer->arguments()[0]->maybe_null)
+        {
+          and_list->
+            push_front(
+              new Item_func_isnotnull(
+                new Item_direct_ref(&unit->outer_select()->context,
+                                    optimizer->arguments()[0]->addr(i),
+                                    (char *)"<no matter>",
+                                    (char *)exists_outer_expr_name)));
+        }
+      }
+      if (and_list->elements > 0)
+      {
+        and_list->push_front(optimizer);
+        exp= new Item_cond_and(*and_list);
+      }
+      else
+        exp= optimizer;
+    }
+    upper_not->arguments()[0]= exp;
+    if (!exp->fixed && exp->fix_fields(thd, upper_not->arguments()))
+    {
+      res= TRUE;
+      goto out;
+    }
+  }
+
+out:
+  thd->lex->current_select= save_select;
+  if (arena)
+    thd->restore_active_arena(arena, &backup);
+  DBUG_RETURN(res);
+}
+
+
 /**
   Prepare IN/ALL/ANY/SOME subquery transformation and call the appropriate
   transformation function.
@@ -2621,14 +3071,23 @@ void Item_in_subselect::print(String *str, enum_query_type query_type)
   Item_subselect::print(str, query_type);
 }
 
+bool Item_exists_subselect::fix_fields(THD *thd_arg, Item **ref)
+{
+  DBUG_ENTER("Item_exists_subselect::fix_fields");
+  if (exists_transformed)
+    DBUG_RETURN( !( (*ref)= new Item_int(1)));
+  DBUG_RETURN(Item_subselect::fix_fields(thd_arg, ref));
+}
+
 
 bool Item_in_subselect::fix_fields(THD *thd_arg, Item **ref)
 {
   uint outer_cols_num;
   List<Item> *inner_cols;
+  DBUG_ENTER("Item_in_subselect::fix_fields");
 
   if (test_strategy(SUBS_SEMI_JOIN))
-    return !( (*ref)= new Item_int(1));
+    DBUG_RETURN( !( (*ref)= new Item_int(1)) );
 
   /*
     Check if the outer and inner IN operands match in those cases when we
@@ -2660,7 +3119,7 @@ bool Item_in_subselect::fix_fields(THD *thd_arg, Item **ref)
     if (outer_cols_num != inner_cols->elements)
     {
       my_error(ER_OPERAND_COLUMNS, MYF(0), outer_cols_num);
-      return TRUE;
+      DBUG_RETURN(TRUE);
     }
     if (outer_cols_num > 1)
     {
@@ -2670,7 +3129,7 @@ bool Item_in_subselect::fix_fields(THD *thd_arg, Item **ref)
       {
         inner_col= inner_col_it++;
         if (inner_col->check_cols(left_expr->element_index(i)->cols()))
-          return TRUE;
+          DBUG_RETURN(TRUE);
       }
     }
   }
@@ -2678,12 +3137,12 @@ bool Item_in_subselect::fix_fields(THD *thd_arg, Item **ref)
   if (thd_arg->lex->is_view_context_analysis() &&
       left_expr && !left_expr->fixed &&
       left_expr->fix_fields(thd_arg, &left_expr))
-    return TRUE;
+    DBUG_RETURN(TRUE);
   else
   if (Item_subselect::fix_fields(thd_arg, ref))
-    return TRUE;
+    DBUG_RETURN(TRUE);
   fixed= TRUE;
-  return FALSE;
+  DBUG_RETURN(FALSE);
 }
 
 
@@ -3811,6 +4270,7 @@ subselect_single_select_engine::change_result(Item_subselect *si,
                                               select_result_interceptor *res,
                                               bool temp)
 {
+  DBUG_ENTER("subselect_single_select_engine::change_result");
   item= si;
   if (temp)
   {
@@ -3831,7 +4291,7 @@ subselect_single_select_engine::change_result(Item_subselect *si,
     that would not require a lot of extra code that would be harder to manage
     than the current code.
   */
-  return select_lex->join->change_result(res);
+  DBUG_RETURN(select_lex->join->change_result(res));
 }
 
 
diff --git a/sql/item_subselect.h b/sql/item_subselect.h
index 1da129380e7..4d9555f0366 100644
--- a/sql/item_subselect.h
+++ b/sql/item_subselect.h
@@ -244,6 +244,7 @@ public:
   virtual bool expr_cache_is_needed(THD *);
   virtual void get_cache_parameters(List<Item> &parameters);
   virtual bool is_subquery_processor (uchar *opt_arg) { return 1; }
+  bool exists2in_processor(uchar *opt_arg) { return 0; }
   bool limit_index_condition_pushdown_processor(uchar *opt_arg) 
   {
     return TRUE;
@@ -338,13 +339,35 @@ public:
 class Item_exists_subselect :public Item_subselect
 {
 protected:
+  Item_func_not *upper_not;
   bool value; /* value of this item (boolean: exists/not-exists) */
+  bool abort_on_null;
 
   void init_length_and_dec();
+  bool select_prepare_to_be_in();
 
 public:
+  /*
+    Used by subquery optimizations to keep track about in which clause this
+    subquery predicate is located: 
+      NO_JOIN_NEST      - the predicate is an AND-part of the WHERE
+      join nest pointer - the predicate is an AND-part of ON expression
+                          of a join nest   
+      NULL              - for all other locations
+  */
+  TABLE_LIST *emb_on_expr_nest;
+  /**
+    Reference on the Item_in_optimizer wrapper of this subquery
+  */
+  Item_in_optimizer *optimizer;
+  /* true if we got this from EXISTS or to IN */
+  bool exists_transformed;
+
   Item_exists_subselect(st_select_lex *select_lex);
-  Item_exists_subselect(): Item_subselect() {}
+  Item_exists_subselect()
+    :Item_subselect(), upper_not(NULL),abort_on_null(0),
+    emb_on_expr_nest(NULL), optimizer(0), exists_transformed(0)
+  {}
 
   subs_type substype() { return EXISTS_SUBS; }
   void reset() 
@@ -360,11 +383,24 @@ public:
   String *val_str(String*);
   my_decimal *val_decimal(my_decimal *);
   bool val_bool();
+  bool fix_fields(THD *thd, Item **ref);
   void fix_length_and_dec();
   virtual void print(String *str, enum_query_type query_type);
+  bool select_transformer(JOIN *join);
+  void top_level_item() { abort_on_null=1; }
+  inline bool is_top_level_item() { return abort_on_null; }
+  bool exists2in_processor(uchar *opt_arg);
 
   Item* expr_cache_insert_transformer(uchar *thd_arg);
 
+  void mark_as_condition_AND_part(TABLE_LIST *embedding)
+  {
+    emb_on_expr_nest= embedding;
+  }
+  virtual void under_not(Item_func_not *upper) { upper_not= upper; };
+
+  void set_exists_transformed() { exists_transformed= TRUE; }
+
   friend class select_exists_subselect;
   friend class subselect_uniquesubquery_engine;
   friend class subselect_indexsubquery_engine;
@@ -424,11 +460,8 @@ protected:
   */
   Item *expr;
   bool was_null;
-  bool abort_on_null;
   /* A bitmap of possible execution strategies for an IN predicate. */
   uchar in_strategy;
-public:
-  Item_in_optimizer *optimizer;
 protected:
   /* Used to trigger on/off conditions that were pushed down to subselect */
   bool *pushed_cond_guards;
@@ -451,15 +484,6 @@ public:
   /* Priority of this predicate in the convert-to-semi-join-nest process. */
   int sj_convert_priority;
   /*
-    Used by subquery optimizations to keep track about in which clause this
-    subquery predicate is located: 
-      NO_JOIN_NEST      - the predicate is an AND-part of the WHERE
-      join nest pointer - the predicate is an AND-part of ON expression
-                          of a join nest   
-      NULL              - for all other locations
-  */
-  TABLE_LIST *emb_on_expr_nest;
-  /*
     Types of left_expr and subquery's select list allow to perform subquery
     materialization. Currently, we set this to FALSE when it as well could
     be TRUE. This is to be properly addressed with fix for BUG#36752.
@@ -527,7 +551,9 @@ public:
   */
   Item *original_item()
   {
-    return is_flattenable_semijoin ? (Item*)this : (Item*)optimizer;
+    return (is_flattenable_semijoin && !exists_transformed ?
+            (Item*)this :
+            (Item*)optimizer);
   }
   
   bool *get_cond_guard(int i)
@@ -546,11 +572,9 @@ public:
   Item_in_subselect(Item * left_expr, st_select_lex *select_lex);
   Item_in_subselect()
     :Item_exists_subselect(), left_expr_cache(0), first_execution(TRUE),
-     abort_on_null(0), in_strategy(SUBS_NOT_TRANSFORMED), optimizer(0),
-    pushed_cond_guards(NULL), func(NULL), emb_on_expr_nest(NULL), 
-    is_jtbm_merged(FALSE), is_jtbm_const_tab(FALSE),
-    upper_item(0)
-    {}
+    in_strategy(SUBS_NOT_TRANSFORMED),
+    pushed_cond_guards(NULL), func(NULL), is_jtbm_merged(FALSE),
+    is_jtbm_const_tab(FALSE), upper_item(0) {}
   void cleanup();
   subs_type substype() { return IN_SUBS; }
   void reset() 
@@ -571,8 +595,6 @@ public:
   my_decimal *val_decimal(my_decimal *);
   void update_null_value () { (void) val_bool(); }
   bool val_bool();
-  void top_level_item() { abort_on_null=1; }
-  inline bool is_top_level_item() { return abort_on_null; }
   bool test_limit(st_select_lex_unit *unit);
   virtual void print(String *str, enum_query_type query_type);
   bool fix_fields(THD *thd, Item **ref);
@@ -589,19 +611,14 @@ public:
   void set_first_execution() { if (first_execution) first_execution= FALSE; }
   bool expr_cache_is_needed(THD *thd);
   inline bool left_expr_has_null();
-  
+
   int optimize(double *out_rows, double *cost);
-  /* 
+  /*
     Return the identifier that we could use to identify the subquery for the
     user.
   */
   int get_identifier();
 
-  void mark_as_condition_AND_part(TABLE_LIST *embedding)
-  {
-    emb_on_expr_nest= embedding;
-  }
-
   bool test_strategy(uchar strategy)
   { return test(in_strategy & strategy); }
 
@@ -630,6 +647,9 @@ public:
 
   void add_strategy (uchar strategy)
   {
+    DBUG_ENTER("Item_in_subselect::add_strategy");
+    DBUG_PRINT("enter", ("current: %u  add: %u",
+                         (uint) in_strategy, (uint) strategy));
     DBUG_ASSERT(strategy != SUBS_NOT_TRANSFORMED);
     DBUG_ASSERT(!(strategy & SUBS_STRATEGY_CHOSEN));
     /*
@@ -639,16 +659,25 @@ public:
       DBUG_ASSERT(!(in_strategy & SUBS_STRATEGY_CHOSEN));
     */
     in_strategy|= strategy;
+    DBUG_VOID_RETURN;
   }
 
   void reset_strategy(uchar strategy)
   {
+    DBUG_ENTER("Item_in_subselect::reset_strategy");
+    DBUG_PRINT("enter", ("current: %u  new: %u",
+                         (uint) in_strategy, (uint) strategy));
     DBUG_ASSERT(strategy != SUBS_NOT_TRANSFORMED);
     in_strategy= strategy;
+    DBUG_VOID_RETURN;
   }
 
   void set_strategy(uchar strategy)
   {
+    DBUG_ENTER("Item_in_subselect::set_strategy");
+    DBUG_PRINT("enter", ("current: %u  set: %u",
+                         (uint) in_strategy,
+                         (uint) (SUBS_STRATEGY_CHOSEN | strategy)));
     /* Check that only one strategy is set for execution. */
     DBUG_ASSERT(strategy == SUBS_SEMI_JOIN ||
                 strategy == SUBS_IN_TO_EXISTS ||
@@ -658,7 +687,12 @@ public:
                 strategy == SUBS_MAXMIN_INJECTED ||
                 strategy == SUBS_MAXMIN_ENGINE);
     in_strategy= (SUBS_STRATEGY_CHOSEN | strategy);
+    DBUG_VOID_RETURN;
   }
+  bool exists2in_processor(uchar *opt_arg __attribute__((unused)))
+  {
+    return 0;
+  };
 
   friend class Item_ref_null_helper;
   friend class Item_is_not_null_test;
@@ -666,6 +700,7 @@ public:
   friend class subselect_indexsubquery_engine;
   friend class subselect_hash_sj_engine;
   friend class subselect_partial_match_engine;
+  friend class Item_exists_subselect;
 };
 
 
diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index 8816e1352a9..ab4827f16aa 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -375,7 +375,12 @@ bool Item_sum::collect_outer_ref_processor(uchar *param)
   if ((ds= depended_from()) &&
       ds->nest_level_base == prm->nest_level_base &&
       ds->nest_level < prm->nest_level)
-    prm->parameters->add_unique(this, &cmp_items);
+  {
+    if (prm->collect)
+      prm->parameters->add_unique(this, &cmp_items);
+    else
+      prm->count++;
+  }
   return FALSE;
 }
 
diff --git a/sql/opt_subselect.cc b/sql/opt_subselect.cc
index e149de6fe53..6698d4af28d 100644
--- a/sql/opt_subselect.cc
+++ b/sql/opt_subselect.cc
@@ -666,6 +666,9 @@ int check_and_do_in_subquery_rewrites(JOIN *join)
         8. No execution method was already chosen (by a prepared statement)
         9. Parent select is not a table-less select
         10. Neither parent nor child select have STRAIGHT_JOIN option.
+        11. It is first optimisation (the subquery could be moved from ON
+        clause during first optimisation and then be considered for SJ
+        on the second when it is too late)
     */
     if (optimizer_flag(thd, OPTIMIZER_SWITCH_SEMIJOIN) &&
         in_subs &&                                                    // 1
@@ -679,7 +682,8 @@ int check_and_do_in_subquery_rewrites(JOIN *join)
         select_lex->outer_select()->leaf_tables.elements &&           // 9
         !((join->select_options |                                     // 10
            select_lex->outer_select()->join->select_options)          // 10
-          & SELECT_STRAIGHT_JOIN))                                    // 10
+          & SELECT_STRAIGHT_JOIN) &&                                  // 10
+        select_lex->first_cond_optimization)                          // 11
     {
       DBUG_PRINT("info", ("Subquery is semi-join conversion candidate"));
 
diff --git a/sql/sql_class.cc b/sql/sql_class.cc
index 7577056c3c5..155c6365e76 100644
--- a/sql/sql_class.cc
+++ b/sql/sql_class.cc
@@ -4639,7 +4639,7 @@ void xid_cache_delete(XID_STATE *xid_state)
 int THD::decide_logging_format(TABLE_LIST *tables)
 {
   DBUG_ENTER("THD::decide_logging_format");
-  DBUG_PRINT("info", ("query: %s", query()));
+  DBUG_PRINT("info", ("Query: %s", query()));
   DBUG_PRINT("info", ("variables.binlog_format: %lu",
                       variables.binlog_format));
   DBUG_PRINT("info", ("lex->get_stmt_unsafe_flags(): 0x%x",
diff --git a/sql/sql_lex.cc b/sql/sql_lex.cc
index b8ce3b6720e..2f81172dc7f 100644
--- a/sql/sql_lex.cc
+++ b/sql/sql_lex.cc
@@ -1876,6 +1876,7 @@ void st_select_lex::init_query()
   max_equal_elems= 0;
   ref_pointer_array= 0;
   select_n_where_fields= 0;
+  select_n_reserved= 0;
   select_n_having_items= 0;
   n_child_sum_items= 0;
   subquery_in_having= explicit_limit= 0;
@@ -2321,6 +2322,7 @@ bool st_select_lex::setup_ref_array(THD *thd, uint order_group_num)
   ref_pointer_array=
     (Item **)thd->stmt_arena->alloc(sizeof(Item*) * (n_child_sum_items +
                                                      item_list.elements +
+                                                     select_n_reserved +
                                                      select_n_having_items +
                                                      select_n_where_fields +
                                                      order_group_num)*5);
diff --git a/sql/sql_lex.h b/sql/sql_lex.h
index be7cdd8ca1d..ec229144b36 100644
--- a/sql/sql_lex.h
+++ b/sql/sql_lex.h
@@ -819,6 +819,8 @@ public:
     and all inner subselects.
   */
   uint select_n_where_fields;
+  /* reserved for exists 2 in */
+  uint select_n_reserved;
   enum_parsing_place parsing_place; /* where we are parsing expression */
   bool with_sum_func;   /* sum function indicator */
 
diff --git a/sql/sql_priv.h b/sql/sql_priv.h
index 345556a0b7f..4e356b48497 100644
--- a/sql/sql_priv.h
+++ b/sql/sql_priv.h
@@ -227,7 +227,7 @@ template <class T> bool valid_buffer_range(T jump,
 #define OPTIMIZER_SWITCH_OPTIMIZE_JOIN_BUFFER_SIZE (1ULL << 25)
 #define OPTIMIZER_SWITCH_TABLE_ELIMINATION         (1ULL << 26)
 #define OPTIMIZER_SWITCH_EXTENDED_KEYS             (1ULL << 27)
-#define OPTIMIZER_SWITCH_LAST                      (1ULL << 27)
+#define OPTIMIZER_SWITCH_EXISTS_TO_IN              (1ULL << 28)
 
 #define OPTIMIZER_SWITCH_DEFAULT   (OPTIMIZER_SWITCH_INDEX_MERGE | \
                                     OPTIMIZER_SWITCH_INDEX_MERGE_UNION | \
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 41c0b07bc49..81f510a4563 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -602,7 +602,9 @@ inline int setup_without_group(THD *thd, Item **ref_pointer_array,
 			       List<Item> &all_fields,
 			       COND **conds,
 			       ORDER *order,
-			       ORDER *group, bool *hidden_group_fields)
+			       ORDER *group,
+                               bool *hidden_group_fields,
+                               uint *reserved)
 {
   int res;
   nesting_map save_allow_sum_func=thd->lex->allow_sum_func ;
@@ -616,6 +618,13 @@ inline int setup_without_group(THD *thd, Item **ref_pointer_array,
 
   thd->lex->allow_sum_func&= ~(1 << thd->lex->current_select->nest_level);
   res= setup_conds(thd, tables, leaves, conds);
+  if (thd->lex->current_select->first_cond_optimization)
+  {
+    if (!res && *conds)
+      (*reserved)= (*conds)->exists2in_reserved_items();
+    else
+      (*reserved)= 0;
+  }
 
   /* it's not wrong to have non-aggregated columns in a WHERE */
   thd->lex->current_select->set_non_agg_field_used(saved_non_agg_field_used);
@@ -763,7 +772,7 @@ JOIN::prepare(Item ***rref_pointer_array,
       setup_without_group(thd, (*rref_pointer_array), tables_list,
 			  select_lex->leaf_tables, fields_list,
 			  all_fields, &conds, order, group_list,
-			  &hidden_group_fields))
+			  &hidden_group_fields, &select_lex->select_n_reserved))
     DBUG_RETURN(-1);				/* purecov: inspected */
 
   ref_pointer_array= *rref_pointer_array;
@@ -1043,6 +1052,23 @@ JOIN::optimize_inner()
     table_count= select_lex->leaf_tables.elements;
     select_lex->update_used_tables();
   }
+  /*
+    In fact we transform underlying subqueries after their 'prepare' phase and
+    before 'optimize' from upper query 'optimize' to allow semijoin
+    conversion happened (which done in the same way.
+  */
+  if(select_lex->first_cond_optimization &&
+     conds && conds->walk(&Item::exists2in_processor, 0, (uchar *)thd))
+    DBUG_RETURN(1);
+  /*
+TODO: make view to decide if it is possible to write to WHERE directly or make Semi-Joins able to process ON condition if it is possible
+  for (TABLE_LIST *tbl= tables_list; tbl; tbl= tbl->next_local)
+  {
+    if (tbl->on_expr &&
+        tbl->on_expr->walk(&Item::exists2in_processor, 0, (uchar *)thd))
+      DBUG_RETURN(1);
+  }
+  */
 
   if (transform_max_min_subquery())
     DBUG_RETURN(1); /* purecov: inspected */
@@ -6004,6 +6030,7 @@ static void choose_initial_table_order(JOIN *join)
   TABLE_LIST *emb_subq;
   JOIN_TAB **tab= join->best_ref + join->const_tables;
   JOIN_TAB **tabs_end= tab + join->table_count - join->const_tables;
+  DBUG_ENTER("choose_initial_table_order");
   /* Find where the top-level JOIN_TABs end and subquery JOIN_TABs start */
   for (; tab != tabs_end; tab++)
   {
@@ -6013,7 +6040,7 @@ static void choose_initial_table_order(JOIN *join)
   uint n_subquery_tabs= tabs_end - tab;
 
   if (!n_subquery_tabs)
-    return;
+    DBUG_VOID_RETURN;
 
   /* Copy the subquery JOIN_TABs to a separate array */
   JOIN_TAB *subquery_tabs[MAX_TABLES];
@@ -6068,6 +6095,7 @@ static void choose_initial_table_order(JOIN *join)
       subq_tab += n_subquery_tables - 1;
     }
   }
+  DBUG_VOID_RETURN;
 }
 
 
@@ -16373,7 +16401,9 @@ evaluate_join_record(JOIN *join, JOIN_TAB *join_tab,
   DBUG_ENTER("evaluate_join_record");
   DBUG_PRINT("enter",
              ("evaluate_join_record join: %p join_tab: %p"
-              " cond: %p error: %d", join, join_tab, select_cond, error));
+              " cond: %p error: %d  alias %s",
+              join, join_tab, select_cond, error,
+              join_tab->table->alias.ptr()));
   if (error > 0 || (join->thd->is_error()))     // Fatal error
     DBUG_RETURN(NESTED_LOOP_ERROR);
   if (error < 0)
@@ -16486,6 +16516,7 @@ evaluate_join_record(JOIN *join, JOIN_TAB *join_tab,
     if (join_tab->check_weed_out_table && found)
     {
       int res= join_tab->check_weed_out_table->sj_weedout_check_row(join->thd);
+      DBUG_PRINT("info", ("weedout_check: %d", res));
       if (res == -1)
         DBUG_RETURN(NESTED_LOOP_ERROR);
       else if (res == 1)
@@ -16506,8 +16537,8 @@ evaluate_join_record(JOIN *join, JOIN_TAB *join_tab,
       (See above join->return_tab= tab).
     */
     join->examined_rows++;
-    DBUG_PRINT("counts", ("join->examined_rows++: %lu",
-                          (ulong) join->examined_rows));
+    DBUG_PRINT("counts", ("join->examined_rows++: %lu  found: %d",
+                          (ulong) join->examined_rows, (int) found));
 
     if (found)
     {
diff --git a/sql/sys_vars.cc b/sql/sys_vars.cc
index d0b39f2b9b0..fcd2df7b338 100644
--- a/sql/sys_vars.cc
+++ b/sql/sys_vars.cc
@@ -1473,6 +1473,7 @@ export const char *optimizer_switch_names[]=
   "optimize_join_buffer_size",
   "table_elimination",
   "extended_keys",
+  "exists_to_in",
   "default", NullS
 };
 /** propagates changes to @@engine_condition_pushdown */
@@ -1514,7 +1515,8 @@ static Sys_var_flagset Sys_optimizer_switch(
         "semijoin_with_cache, "
         "subquery_cache, "
         "table_elimination, "
-        "extended_keys "
+        "extended_keys, "
+        "exists_to_in "
        "} and val is one of {on, off, default}",
        SESSION_VAR(optimizer_switch), CMD_LINE(REQUIRED_ARG),
        optimizer_switch_names, DEFAULT(OPTIMIZER_SWITCH_DEFAULT),