MWL#90: Subqueries: Inside-out execution for non-semijoin materialized subqueries that are AND-parts of the WHERE

- Merge into 5.3-subqueries

30 files changed, 717 insertions, 584 deletions

diff --git a/mysql-test/include/mix1.inc b/mysql-test/include/mix1.inc
index e709db6887c..f1ee91916b9 100644
--- a/mysql-test/include/mix1.inc
+++ b/mysql-test/include/mix1.inc
@@ -1522,6 +1522,12 @@ INSERT INTO t1 VALUES (1,1,1), (1,1,1), (1,1,2), (1,1,1), (1,1,2);
 
 SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
                  FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
+--echo # MariaDB note:
+--echo #  This will show 2 for table which has 5 rows. 
+--echo #  This is because the access method employed is actually range access
+--echo #  which scans 2 records (yes, EXPLAIN displays it incorrectly).
+--echo #  our correct printing is an artifact of changing in select_describe()
+--echo #  from printing table->starts.records() to tab->records.
 EXPLAIN 
 SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
                  FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
@@ -1535,6 +1541,7 @@ INSERT INTO t1 VALUES (1,1,1), (1,1,1), (1,1,2), (1,1,1), (1,1,2);
 
 SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
                  FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
+--echo # See above "MariaDB note"
 EXPLAIN 
 SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
                  FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
@@ -1549,6 +1556,7 @@ INSERT INTO t1 VALUES (1,1,1), (1,1,1), (1,1,2), (1,1,1), (1,1,2);
 
 SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
                  FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
+--echo # See above "MariaDB note"
 EXPLAIN 
 SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
                  FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
diff --git a/mysql-test/r/group_min_max.result b/mysql-test/r/group_min_max.result
index 5e161780bd4..371f2590721 100644
--- a/mysql-test/r/group_min_max.result
+++ b/mysql-test/r/group_min_max.result
@@ -2255,7 +2255,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE 
 a IN (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1_outer	index	NULL	a	10	NULL	15	Using where; Using index
+1	PRIMARY	SUBQUERY#2	ALL	distinct_key	NULL	NULL	NULL	8	
+1	PRIMARY	t1_outer	ref	a	a	5	SUBQUERY#2.max(b)	2	Using index
 2	SUBQUERY	t1	range	NULL	a	5	NULL	8	Using index for group-by
 EXPLAIN SELECT 1 FROM t1 AS t1_outer GROUP BY a HAVING 
 a > (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);
diff --git a/mysql-test/r/innodb_mysql.result b/mysql-test/r/innodb_mysql.result
index 1352bf7f314..8f2ad4ca4c2 100644
--- a/mysql-test/r/innodb_mysql.result
+++ b/mysql-test/r/innodb_mysql.result
@@ -1727,12 +1727,18 @@ SELECT 1 FROM (SELECT COUNT(DISTINCT c1)
 FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
 1
 1
+# MariaDB note:
+#  This will show 2 for table which has 5 rows. 
+#  This is because the access method employed is actually range access
+#  which scans 2 records (yes, EXPLAIN displays it incorrectly).
+#  our correct printing is an artifact of changing in select_describe()
+#  from printing table->starts.records() to tab->records.
 EXPLAIN 
 SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
 FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t1	index	c3,c2	c2	10	NULL	5	
+2	DERIVED	t1	index	c3,c2	c2	10	NULL	2	
 DROP TABLE t1;
 CREATE TABLE t1 (c1 REAL, c2 REAL, c3 REAL, KEY (c3), KEY (c2, c3))
 ENGINE=InnoDB;
@@ -1741,12 +1747,13 @@ SELECT 1 FROM (SELECT COUNT(DISTINCT c1)
 FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
 1
 1
+# See above "MariaDB note"
 EXPLAIN 
 SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
 FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t1	index	c3,c2	c2	18	NULL	5	
+2	DERIVED	t1	index	c3,c2	c2	18	NULL	2	
 DROP TABLE t1;
 CREATE TABLE t1 (c1 DECIMAL(12,2), c2 DECIMAL(12,2), c3 DECIMAL(12,2), 
 KEY (c3), KEY (c2, c3))
@@ -1756,12 +1763,13 @@ SELECT 1 FROM (SELECT COUNT(DISTINCT c1)
 FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
 1
 1
+# See above "MariaDB note"
 EXPLAIN 
 SELECT 1 FROM (SELECT COUNT(DISTINCT c1) 
 FROM t1 WHERE c2 IN (1, 1) AND c3 = 2 GROUP BY c2) x;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t1	index	c3,c2	c2	14	NULL	5	
+2	DERIVED	t1	index	c3,c2	c2	14	NULL	2	
 DROP TABLE t1;
 End of 5.1 tests
 drop table if exists t1, t2, t3;
diff --git a/mysql-test/r/metadata.result b/mysql-test/r/metadata.result
index 6b498e55d85..59a80bb80f9 100644
--- a/mysql-test/r/metadata.result
+++ b/mysql-test/r/metadata.result
@@ -55,7 +55,7 @@ id	data	data
 2	female	no
 select t1.id from t1 union select t2.id from t2;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def				id	id	1	4	1	Y	32768	0	63
+def				id	id	1	4	1	Y	49152	0	63
 id
 1
 2
@@ -66,7 +66,7 @@ insert into t1 values (2,'two');
 set @arg00=1 ;
 select @arg00 FROM t1 where a=1 union distinct select 1 FROM t1 where a=1;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def				@arg00	@arg00	8	20	1	Y	32768	0	63
+def				@arg00	@arg00	8	20	1	Y	49152	0	63
 @arg00
 1
 select * from (select @arg00) aaa;
@@ -76,7 +76,7 @@ def			aaa	@arg00	@arg00	8	20	1	Y	32768	0	63
 1
 select 1 union select 1;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def				1	1	8	20	1	N	32769	0	63
+def				1	1	8	20	1	N	49153	0	63
 1
 1
 select * from (select 1 union select 1) aaa;
diff --git a/mysql-test/r/myisam_mrr.result b/mysql-test/r/myisam_mrr.result
index 27ae694570f..864429ca655 100644
--- a/mysql-test/r/myisam_mrr.result
+++ b/mysql-test/r/myisam_mrr.result
@@ -347,7 +347,7 @@ GROUP BY t2.pk
 );
 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	t2	ALL	int_key	int_key	5		3	33.33	Using index condition; Using filesort
+2	SUBQUERY	t2	ALL	int_key	int_key	5		0	0.00	Using index condition; Using filesort
 Warnings:
 Note	1003	select min(`test`.`t1`.`pk`) AS `MIN(t1.pk)` from `test`.`t1` where 0
 DROP TABLE t1, t2;
diff --git a/mysql-test/r/partition.result b/mysql-test/r/partition.result
index 08357795046..50a00774204 100644
--- a/mysql-test/r/partition.result
+++ b/mysql-test/r/partition.result
@@ -1382,7 +1382,7 @@ NULL
 2
 explain partitions select * from t1 where a is null or a < 0 or a > 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pn,p2	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	pn,p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 drop table t1;
 CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY, name VARCHAR(20)) 
 ENGINE=MyISAM DEFAULT CHARSET=latin1
diff --git a/mysql-test/r/partition_hash.result b/mysql-test/r/partition_hash.result
index 19da70db5a0..94fefe77a77 100644
--- a/mysql-test/r/partition_hash.result
+++ b/mysql-test/r/partition_hash.result
@@ -69,25 +69,25 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
 explain partitions select * from t1 where a is null or (a >= 5 and a <= 7);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p0,p2,p3	ALL	NULL	NULL	NULL	NULL	7	Using where
 explain partitions select * from t1 where a is null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t1 where a is not null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
 explain partitions select * from t1 where a >= 1 and a < 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	5	Using where
 explain partitions select * from t1 where a >= 3 and a <= 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a > 2 and a < 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a > 3 and a <= 6;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p2,p3	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a > 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
diff --git a/mysql-test/r/partition_pruning.result b/mysql-test/r/partition_pruning.result
index 6c8de3cc04d..4a99270c7a1 100644
--- a/mysql-test/r/partition_pruning.result
+++ b/mysql-test/r/partition_pruning.result
@@ -89,7 +89,7 @@ a
 1
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p0,p1	index	PRIMARY	PRIMARY	4	NULL	3	Using where; Using index
 SELECT * FROM t1 WHERE a <= 2;
 a
 -1
@@ -98,7 +98,7 @@ a
 2
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 2;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1,p2	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p0,p1,p2	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index
 SELECT * FROM t1 WHERE a <= 3;
 a
 -1
@@ -108,7 +108,7 @@ a
 3
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1,p2,p3	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p0,p1,p2,p3	index	PRIMARY	PRIMARY	4	NULL	5	Using where; Using index
 SELECT * FROM t1 WHERE a <= 4;
 a
 -1
@@ -119,7 +119,7 @@ a
 4
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1,p2,p3,p4	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p0,p1,p2,p3,p4	index	PRIMARY	PRIMARY	4	NULL	6	Using where; Using index
 SELECT * FROM t1 WHERE a <= 5;
 a
 -1
@@ -131,7 +131,7 @@ a
 5
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1,p2,p3,p4,p5	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p0,p1,p2,p3,p4,p5	index	PRIMARY	PRIMARY	4	NULL	7	Using where; Using index
 SELECT * FROM t1 WHERE a <= 6;
 a
 -1
@@ -213,7 +213,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1,p2,p3,p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p1,p2,p3,p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	8	Using where; Using index
 SELECT * FROM t1 WHERE a >= 2;
 a
 2
@@ -225,7 +225,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 2;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2,p3,p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p2,p3,p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	7	Using where; Using index
 SELECT * FROM t1 WHERE a >= 3;
 a
 3
@@ -236,7 +236,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p3,p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p3,p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	6	Using where; Using index
 SELECT * FROM t1 WHERE a >= 4;
 a
 4
@@ -246,7 +246,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	5	Using where; Using index
 SELECT * FROM t1 WHERE a >= 5;
 a
 5
@@ -255,7 +255,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p5,max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p5,max	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index
 SELECT * FROM t1 WHERE a >= 6;
 a
 6
@@ -263,7 +263,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 6;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	max	index	PRIMARY	PRIMARY	4	NULL	3	Using where; Using index
 SELECT * FROM t1 WHERE a >= 7;
 a
 7
@@ -282,7 +282,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2,p3,p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p2,p3,p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	7	Using where; Using index
 SELECT * FROM t1 WHERE a > 2;
 a
 3
@@ -293,7 +293,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 2;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p3,p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p3,p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	6	Using where; Using index
 SELECT * FROM t1 WHERE a > 3;
 a
 4
@@ -303,7 +303,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p4,p5,max	index	PRIMARY	PRIMARY	4	NULL	5	Using where; Using index
 SELECT * FROM t1 WHERE a > 4;
 a
 5
@@ -312,7 +312,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p5,max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	p5,max	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index
 SELECT * FROM t1 WHERE a > 5;
 a
 6
@@ -320,7 +320,7 @@ a
 8
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	max	index	PRIMARY	PRIMARY	4	NULL	10	Using where; Using index
+1	SIMPLE	t1	max	index	PRIMARY	PRIMARY	4	NULL	3	Using where; Using index
 SELECT * FROM t1 WHERE a > 6;
 a
 7
@@ -408,7 +408,7 @@ a
 1
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p0,p1	index	PRIMARY	PRIMARY	4	NULL	3	Using where; Using index
 SELECT * FROM t1 WHERE a <= 2;
 a
 -1
@@ -417,7 +417,7 @@ a
 2
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 2;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1,p2	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p0,p1,p2	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index
 SELECT * FROM t1 WHERE a <= 3;
 a
 -1
@@ -427,7 +427,7 @@ a
 3
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1,p2,p3	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p0,p1,p2,p3	index	PRIMARY	PRIMARY	4	NULL	5	Using where; Using index
 SELECT * FROM t1 WHERE a <= 4;
 a
 -1
@@ -438,7 +438,7 @@ a
 4
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1,p2,p3,p4	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p0,p1,p2,p3,p4	index	PRIMARY	PRIMARY	4	NULL	6	Using where; Using index
 SELECT * FROM t1 WHERE a <= 5;
 a
 -1
@@ -511,7 +511,7 @@ a
 7
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1,p2,p3,p4,max	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p1,p2,p3,p4,max	index	PRIMARY	PRIMARY	4	NULL	7	Using where; Using index
 SELECT * FROM t1 WHERE a >= 2;
 a
 2
@@ -522,7 +522,7 @@ a
 7
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 2;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2,p3,p4,max	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p2,p3,p4,max	index	PRIMARY	PRIMARY	4	NULL	6	Using where; Using index
 SELECT * FROM t1 WHERE a >= 3;
 a
 3
@@ -532,7 +532,7 @@ a
 7
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p3,p4,max	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p3,p4,max	index	PRIMARY	PRIMARY	4	NULL	5	Using where; Using index
 SELECT * FROM t1 WHERE a >= 4;
 a
 4
@@ -541,7 +541,7 @@ a
 7
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4,max	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p4,max	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index
 SELECT * FROM t1 WHERE a >= 5;
 a
 5
@@ -549,7 +549,7 @@ a
 7
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	max	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	max	index	PRIMARY	PRIMARY	4	NULL	3	Using where; Using index
 SELECT * FROM t1 WHERE a >= 6;
 a
 6
@@ -567,7 +567,7 @@ a
 7
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2,p3,p4,max	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p2,p3,p4,max	index	PRIMARY	PRIMARY	4	NULL	6	Using where; Using index
 SELECT * FROM t1 WHERE a > 2;
 a
 3
@@ -577,7 +577,7 @@ a
 7
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 2;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p3,p4,max	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p3,p4,max	index	PRIMARY	PRIMARY	4	NULL	5	Using where; Using index
 SELECT * FROM t1 WHERE a > 3;
 a
 4
@@ -586,7 +586,7 @@ a
 7
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4,max	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	p4,max	index	PRIMARY	PRIMARY	4	NULL	4	Using where; Using index
 SELECT * FROM t1 WHERE a > 4;
 a
 5
@@ -594,7 +594,7 @@ a
 7
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	max	index	PRIMARY	PRIMARY	4	NULL	9	Using where; Using index
+1	SIMPLE	t1	max	index	PRIMARY	PRIMARY	4	NULL	3	Using where; Using index
 SELECT * FROM t1 WHERE a > 5;
 a
 6
@@ -880,34 +880,34 @@ a
 1001-01-01
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a < '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p1001-01-01,p2001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p1001-01-01,p2001-01-01	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p2001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p2001-01-01	ALL	NULL	NULL	NULL	NULL	4	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a = '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p1001-01-01	system	NULL	NULL	NULL	NULL	1	
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a < '1001-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= '1001-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= '1001-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p1001-01-01,p2001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p1001-01-01,p2001-01-01	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > '1001-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p1001-01-01,p2001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p1001-01-01,p2001-01-01	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a = '1001-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL	ALL	NULL	NULL	NULL	NULL	3	Using where
 # Disabling warnings for the invalid date
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a < '1999-02-31';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -917,25 +917,25 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01,p2001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= '1999-02-31';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p2001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p2001-01-01	ALL	NULL	NULL	NULL	NULL	4	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > '1999-02-31';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p2001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p2001-01-01	ALL	NULL	NULL	NULL	NULL	4	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a = '1999-02-31';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL	ALL	NULL	NULL	NULL	NULL	3	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a BETWEEN '0000-00-00' AND '1002-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01,p2001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a BETWEEN '0000-00-00' AND '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a BETWEEN '0001-01-02' AND '1002-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p1001-01-01,p2001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p1001-01-01,p2001-01-01	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a BETWEEN '0001-01-01' AND '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p0001-01-01,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 DROP TABLE t1;
 # test of LIST and index
 CREATE TABLE t1 (a DATE, KEY(a))
@@ -1209,62 +1209,62 @@ a
 1001-01-01
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a < '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2001-01-01,pNULL,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p2001-01-01,pNULL,p1001-01-01	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2001-01-01,pNULL	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p2001-01-01,pNULL	ALL	NULL	NULL	NULL	NULL	4	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a = '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p1001-01-01	system	NULL	NULL	NULL	NULL	1	
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a < '1001-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= '1001-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= '1001-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2001-01-01,pNULL,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p2001-01-01,pNULL,p1001-01-01	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > '1001-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2001-01-01,pNULL,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p2001-01-01,pNULL,p1001-01-01	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a = '1001-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL	ALL	NULL	NULL	NULL	NULL	3	Using where
 # Disabling warnings for the invalid date
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a < '1999-02-31';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a <= '1999-02-31';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a >= '1999-02-31';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2001-01-01,pNULL	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p2001-01-01,pNULL	ALL	NULL	NULL	NULL	NULL	4	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > '1999-02-31';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2001-01-01,pNULL	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p2001-01-01,pNULL	ALL	NULL	NULL	NULL	NULL	4	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a = '1999-02-31';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL	ALL	NULL	NULL	NULL	NULL	3	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a BETWEEN '0000-00-00' AND '1002-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a BETWEEN '0000-00-00' AND '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p0001-01-01,pNULL,p0000-01-02,p1001-01-01	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a BETWEEN '0001-01-02' AND '1002-00-00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pNULL,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	pNULL,p1001-01-01	ALL	NULL	NULL	NULL	NULL	4	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a BETWEEN '0001-01-01' AND '1001-01-01';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0001-01-01,pNULL,p1001-01-01	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p0001-01-01,pNULL,p1001-01-01	ALL	NULL	NULL	NULL	NULL	5	Using where
 DROP TABLE t1;
 # Test with DATETIME column NOT NULL
 CREATE TABLE t1 (
@@ -1289,25 +1289,25 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	8	Using where; Using index
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	2	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	6	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	6	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090402	index	NULL	PRIMARY	12	NULL	3	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1315,99 +1315,99 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	6	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	2	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	6	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	2	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	6	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	6	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090402	index	NULL	PRIMARY	12	NULL	3	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p20090401,p20090402,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	6	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	2	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	12	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	12	NULL	2	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	12	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	6	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	12	NULL	6	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090402	index	NULL	PRIMARY	12	NULL	13	Using where; Using index
+1	SIMPLE	t1	p20090402	index	NULL	PRIMARY	12	NULL	3	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1440,21 +1440,21 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	7	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	7	Using where; Using index
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	2	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	5	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	5	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1462,79 +1462,79 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	5	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	7	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	2	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	5	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	7	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	2	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	5	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	5	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	5	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	7	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090403	index	NULL	PRIMARY	7	NULL	2	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	7	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402,p20090403	index	NULL	PRIMARY	7	NULL	7	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1542,19 +1542,19 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	8	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	5	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090402	index	NULL	PRIMARY	7	NULL	5	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1562,11 +1562,11 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	10	Using where; Using index
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b > CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	12	Using where; Using index
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	index	NULL	PRIMARY	7	NULL	10	Using where; Using index
 DROP TABLE t1;
 # Test with DATETIME column NULL
 CREATE TABLE t1 (
@@ -1590,25 +1590,25 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	8	Using where
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	2	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090402	ALL	NULL	NULL	NULL	NULL	3	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1616,99 +1616,99 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	2	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	2	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090402	ALL	NULL	NULL	NULL	NULL	3	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p20090401,p20090402,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	2	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	2	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	6	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090402	ALL	NULL	NULL	NULL	NULL	13	Using where
+1	SIMPLE	t1	p20090402	ALL	NULL	NULL	NULL	NULL	3	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1740,21 +1740,21 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	7	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	7	Using where
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	2	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1762,79 +1762,79 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b > CAST('2009-04-02 23:59:59' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	7	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	2	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > CAST('2009-04-03' AS DATE);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	7	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	2	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03 00:00:00';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-02 23:59:59';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b < '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b <= '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	7	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b = '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090403	ALL	NULL	NULL	NULL	NULL	2	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b >= '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1 WHERE b > '2009-04-03';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	7	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402,p20090403	ALL	NULL	NULL	NULL	NULL	7	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1842,19 +1842,19 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b > CAST('2009-04-03 00:00:01' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	8	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b < CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b <= CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090402	ALL	NULL	NULL	NULL	NULL	5	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b = CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1862,11 +1862,11 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b >= CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 EXPLAIN PARTITIONS SELECT * FROM t1
 WHERE b > CAST('2009-04-02 23:59:58' AS DATETIME);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t1	p20090401,p20090403,p20090404,p20090405	ALL	NULL	NULL	NULL	NULL	10	Using where
 DROP TABLE t1;
 # For better code coverage of the patch
 CREATE TABLE t1 (
@@ -1930,7 +1930,7 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0,p1	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t2 where a=1 and b=1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 create table t3 (
 a int
 )
@@ -1988,25 +1988,25 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 explain partitions select * from t5
 where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t5	p0_p0sp0,p0_p0sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t5	p0_p0sp0,p0_p0sp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t5 where (a=10 and b=2) or (a=10 and b=3)
 or (a=10 and b = 4);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t5	p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t5 where (c=1 and d=1);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t5	p0_p0sp0,p1_p1sp0	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t5	p0_p0sp0,p1_p1sp0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t5 where (c=2 and d=1);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t5	p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t5	p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or 
 (c=2 and d=1);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t5	p0_p0sp0,p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t5	p0_p0sp0,p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or 
 (b=2 and c=2 and d=1);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t5	p0_p0sp0,p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t5	p0_p0sp0,p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	3	Using where
 create table t6 (a int not null) partition by LIST(a) (
 partition p1 values in (1),
 partition p3 values in (3),
@@ -2044,7 +2044,7 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t6	p5,p7,p9	system	NULL	NULL	NULL	NULL	1	
 explain partitions select * from t6 where a >= 3 and a <= 8;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p3,p5,p7	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t6	p3,p5,p7	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a > 3 and a < 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@@ -2086,7 +2086,7 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t6	p5,p7,p9	system	NULL	NULL	NULL	NULL	1	
 explain partitions select * from t6 where a >= 3 and a <= 8;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p3,p5,p7	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t6	p3,p5,p7	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a > 3 and a < 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@@ -2241,7 +2241,7 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 explain partitions
 select * from t1 X, t1 Y where X.a = Y.a and (X.a=1 or X.a=2);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	X	p1,p2	ALL	a	NULL	NULL	NULL	4	Using where
+1	SIMPLE	X	p1,p2	ALL	a	NULL	NULL	NULL	2	Using where
 1	SIMPLE	Y	p1,p2	ref	a	a	4	test.X.a	2	
 drop table t1;
 create table t1 (a int) partition by hash(a) partitions 20;
@@ -2254,7 +2254,7 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a >  1 and a <= 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2,p3	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	p2,p3	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a >= 1 and a <= 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p1,p2,p3	ALL	NULL	NULL	NULL	NULL	3	Using where
@@ -2344,22 +2344,22 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0,p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	1010	
 explain partitions select * from t2 where a < 801 and a > 200;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	800	Using where
 explain partitions select * from t2 where a < 801 and a > 800;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p4	ALL	NULL	NULL	NULL	NULL	200	Using where
 explain partitions select * from t2 where a > 600;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	400	Using where
 explain partitions select * from t2 where a > 600 and b = 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	400	Using where
 explain partitions select * from t2 where a > 600 and b = 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	400	Using where
 explain partitions select * from t2 where a > 600 and b = 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	400	Using where
 explain partitions select * from t2 where b = 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0,p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
@@ -2414,19 +2414,19 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0,p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	910	
 explain partitions select * from t2 where a = 101;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	910	Using where
+1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	110	Using where
 explain partitions select * from t2 where a = 550;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	910	Using where
+1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	200	Using where
 explain partitions select * from t2 where a = 833;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p4	ALL	NULL	NULL	NULL	NULL	910	Using where
+1	SIMPLE	t2	p4	ALL	NULL	NULL	NULL	NULL	200	Using where
 explain partitions select * from t2 where (a = 100 OR a = 900);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0,p4	ALL	NULL	NULL	NULL	NULL	910	Using where
+1	SIMPLE	t2	p0,p4	ALL	NULL	NULL	NULL	NULL	310	Using where
 explain partitions select * from t2 where (a > 100 AND a < 600);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0,p1,p2	ALL	NULL	NULL	NULL	NULL	910	Using where
+1	SIMPLE	t2	p0,p1,p2	ALL	NULL	NULL	NULL	NULL	510	Using where
 explain partitions select * from t2 where b = 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0,p1,p2,p3,p4	ref	b	b	5	const	76	
@@ -2712,17 +2712,17 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 explain partitions select * from t1 
 where a >= 18446744073709551000-1 and a <= 18446744073709551000+1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p3,p4	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p3,p4	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t1 
 where a between 18446744073709551001 and 18446744073709551002;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a = 18446744073709551000;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a = 18446744073709551613;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a = 18446744073709551614;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@@ -2749,10 +2749,10 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a=0xFE;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t2 where a=0xFE;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a > 0xFE AND a <= 0xFF;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@@ -2761,22 +2761,22 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 explain partitions select * from t1 where a >= 0xFE AND a <= 0xFF;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t2 where a >= 0xFE AND a <= 0xFF;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a < 64 AND a >= 63;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t2 where a < 64 AND a >= 63;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a <= 64 AND a >= 63;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t2 where a <= 64 AND a >= 63;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0,p1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t2	p0,p1	ALL	NULL	NULL	NULL	NULL	4	Using where
 drop table t1;
 drop table t2;
 create table t1(a bigint unsigned not null) partition by range(a+0) (
diff --git a/mysql-test/r/partition_range.result b/mysql-test/r/partition_range.result
index 02d2f6359c5..5ba6b506765 100644
--- a/mysql-test/r/partition_range.result
+++ b/mysql-test/r/partition_range.result
@@ -59,13 +59,13 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	pnull	system	NULL	NULL	NULL	NULL	1	
 explain partitions select * from t1 where a >= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a < 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 explain partitions select * from t1 where a <= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull,p0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	pnull,p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a > 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@@ -98,16 +98,16 @@ select * from t1 where a > 1;
 a	b
 explain partitions select * from t1 where a is null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a >= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a < 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a <= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1,p0_p0sp0,p0_p0sp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1,p0_p0sp0,p0_p0sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a > 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
diff --git a/mysql-test/r/subselect.result b/mysql-test/r/subselect.result
index 8802f8d6aa2..ab04b2a0ce5 100644
--- a/mysql-test/r/subselect.result
+++ b/mysql-test/r/subselect.result
@@ -3417,7 +3417,8 @@ 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	t1	ALL	NULL	NULL	NULL	NULL	9	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	23	test.t1.a,test.t1.b	1	
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 ALTER TABLE t1 ADD INDEX(a);
 SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a);
@@ -3428,7 +3429,8 @@ 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	t1	ALL	a	NULL	NULL	NULL	9	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	23	test.t1.a,test.t1.b	1	
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 DROP TABLE t1;
 create table t1( f1 int,f2 int);
@@ -4322,16 +4324,18 @@ CREATE TABLE t1 (a INT);
 INSERT INTO t1 VALUES (1),(2);
 EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT 1 FROM t1 GROUP BY 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	SUBQUERY#2	const	distinct_key	distinct_key	4	const	1	100.00	
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
 Warnings:
-Note	1003	select 1 AS `1` from `test`.`t1` where <in_optimizer>(1,1 in ( <materialize> (select 1 AS `1` from `test`.`t1` group by `test`.`t1`.`a` ), <primary_index_lookup>(1 in <temporary table> on distinct_key where ((1 = `materialized subselect`.`1`)))))
+Note	1003	select 1 AS `1` from  <materialize> (select 1 AS `1` from `test`.`t1` group by `test`.`t1`.`a`) join `test`.`t1` where (`SUBQUERY#2`.`1` = 1)
 EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT 1 FROM t1 WHERE a > 3 GROUP BY 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	SUBQUERY#2	const	distinct_key	distinct_key	4	const	1	100.00	
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using temporary; Using filesort
 Warnings:
-Note	1003	select 1 AS `1` from `test`.`t1` where <in_optimizer>(1,1 in ( <materialize> (select 1 AS `1` from `test`.`t1` where (`test`.`t1`.`a` > 3) group by `test`.`t1`.`a` ), <primary_index_lookup>(1 in <temporary table> on distinct_key where ((1 = `materialized subselect`.`1`)))))
+Note	1003	select 1 AS `1` from  <materialize> (select 1 AS `1` from `test`.`t1` where (`test`.`t1`.`a` > 3) group by `test`.`t1`.`a`) join `test`.`t1` where (`SUBQUERY#2`.`1` = 1)
 DROP TABLE t1;
 #
 # Bug#45061: Incorrectly market field caused wrong result.
diff --git a/mysql-test/r/subselect3.result b/mysql-test/r/subselect3.result
index af483939598..e3eefc00e67 100644
--- a/mysql-test/r/subselect3.result
+++ b/mysql-test/r/subselect3.result
@@ -1017,7 +1017,7 @@ update t22 set c = '2005-12-08 15:58:27' where a = 255;
 explain select t21.* from t21,t22 where t21.a = t22.a and 
 t22.a in (select t12.a from t11, t12 where t11.a in(255,256) and t11.a = t12.a and t11.c is null) and t22.c is null order by t21.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	8	Using temporary; Using filesort
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	8	Using temporary; Using filesort
 1	PRIMARY	t21	ALL	NULL	NULL	NULL	NULL	26	Using where; Using join buffer
 1	PRIMARY	t22	ALL	NULL	NULL	NULL	NULL	26	Using where; Using join buffer
 2	SUBQUERY	t11	ALL	NULL	NULL	NULL	NULL	8	Using where
@@ -1035,7 +1035,7 @@ select (select max(Y.a) from t1 Y where a in (select a from t1 Z) and a < X.a) a
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	X	ALL	NULL	NULL	NULL	NULL	2	
 2	DEPENDENT SUBQUERY	Y	ALL	NULL	NULL	NULL	NULL	2	Using where
-2	DEPENDENT SUBQUERY	subselect3	eq_ref	unique_key	unique_key	5	func	1	
+2	DEPENDENT SUBQUERY	SUBQUERY#3	eq_ref	unique_key	unique_key	5	func	1	
 3	SUBQUERY	Z	ALL	NULL	NULL	NULL	NULL	2	
 select (select max(Y.a) from t1 Y where a in (select a from t1 Z) and a < X.a) as subq from t1 X;
 subq
@@ -1158,7 +1158,7 @@ create table t3 ( a int , filler char(100), key(a));
 insert into t3 select A.a + 10*B.a, 'filler' from t0 A, t0 B;
 explain select * from t3 where a in (select a from t2) and (a > 5 or a < 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	2	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	2	
 1	PRIMARY	t3	ref	a	a	5	test.t2.a	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 select * from t3 where a in (select a from t2);
@@ -1207,29 +1207,33 @@ insert into t3 select A.a + 10*B.a, A.a + 10*B.a, 'filler' from t1 A, t1 B, t1 C
 explain select * from t1, t3 where t3.a in (select a from t2) and (t3.a < 10 or t3.a >30) and t1.a =3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	10	Using where
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	10	
 1	PRIMARY	t3	ref	a	a	5	test.t2.a	10	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where
 explain select straight_join * from t1 A, t1 B where A.a in (select a from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	A	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	PRIMARY	A	ALL	NULL	NULL	NULL	NULL	10	
 1	PRIMARY	B	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.A.a	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	10	
 explain select * from t2 where a in (select straight_join A.a from t1 A, t1 B);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.t2.a	1	
 2	SUBQUERY	A	ALL	NULL	NULL	NULL	NULL	10	
 2	SUBQUERY	B	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
 explain select * from t2 where a in (select straight_join A.a from t1 A, t1 B);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.t2.a	1	
 2	SUBQUERY	A	ALL	NULL	NULL	NULL	NULL	10	
 2	SUBQUERY	B	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
 explain select straight_join * from t2 X, t2 Y 
 where X.a in (select straight_join A.a from t1 A, t1 B);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	X	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	PRIMARY	X	ALL	NULL	NULL	NULL	NULL	10	
 1	PRIMARY	Y	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.X.a	1	
 2	SUBQUERY	A	ALL	NULL	NULL	NULL	NULL	10	
 2	SUBQUERY	B	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
 create table t0 (a int, b int);
@@ -1237,14 +1241,14 @@ insert into t0 values(1,1);
 explain select * from t0, t3 where t3.a in (select a from t2) and (t3.a < 10 or t3.a >30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t0	system	NULL	NULL	NULL	NULL	1	
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	10	
 1	PRIMARY	t3	ref	a	a	5	test.t2.a	10	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where
 create table t4 as select a as x, a as y from t1;
 explain select * from t0, t3 where (t3.a, t3.b) in (select x,y from t4) and (t3.a < 10 or t3.a >30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t0	system	NULL	NULL	NULL	NULL	1	
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	10	
 1	PRIMARY	t3	ref	a	a	5	test.t4.x	10	Using where
 2	SUBQUERY	t4	ALL	NULL	NULL	NULL	NULL	10	Using where
 drop table t0,t1,t2,t3,t4;
@@ -1270,14 +1274,14 @@ set @@optimizer_switch='firstmatch=off';
 explain select * from t1 where (a,b) in (select a,b from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	10	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	10	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	10	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	100	
 set @save_optimizer_search_depth=@@optimizer_search_depth;
 set @@optimizer_search_depth=63;
 explain select * from t1 where (a,b) in (select a,b from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	10	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	10	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	10	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	100	
 set @@optimizer_search_depth=@save_optimizer_search_depth;
 set @@optimizer_switch=default;
@@ -1316,7 +1320,7 @@ insert into t2 select * from t2;
 explain select * from t1 where (a,b,c) in (select X.a, Y.a, Z.a from t2 X, t2 Y, t2 Z where X.b=33);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	15	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	15	func	1	
 2	SUBQUERY	X	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	Y	ALL	NULL	NULL	NULL	NULL	6	Using join buffer
 2	SUBQUERY	Z	ALL	NULL	NULL	NULL	NULL	6	Using join buffer
@@ -1389,7 +1393,7 @@ INNER JOIN t2 c ON c.idContact=cona.idContact
 WHERE cona.postalStripped='T2H3B2'
 	);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	2	1.00	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	2	1.00	
 1	PRIMARY	a	index	PRIMARY	PRIMARY	4	NULL	2	100.00	Using where; Using index; Using join buffer
 2	SUBQUERY	cona	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 2	SUBQUERY	c	eq_ref	PRIMARY	PRIMARY	4	test.cona.idContact	1	100.00	
diff --git a/mysql-test/r/subselect3_jcl6.result b/mysql-test/r/subselect3_jcl6.result
index 8d0ccd7c9f5..4b26872cfe0 100644
--- a/mysql-test/r/subselect3_jcl6.result
+++ b/mysql-test/r/subselect3_jcl6.result
@@ -1021,7 +1021,7 @@ update t22 set c = '2005-12-08 15:58:27' where a = 255;
 explain select t21.* from t21,t22 where t21.a = t22.a and 
 t22.a in (select t12.a from t11, t12 where t11.a in(255,256) and t11.a = t12.a and t11.c is null) and t22.c is null order by t21.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	8	Using temporary; Using filesort
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	8	Using temporary; Using filesort
 1	PRIMARY	t21	ALL	NULL	NULL	NULL	NULL	26	Using where; Using join buffer
 1	PRIMARY	t22	ALL	NULL	NULL	NULL	NULL	26	Using where; Using join buffer
 2	SUBQUERY	t11	ALL	NULL	NULL	NULL	NULL	8	Using where
@@ -1040,7 +1040,7 @@ select (select max(Y.a) from t1 Y where a in (select a from t1 Z) and a < X.a) a
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	X	ALL	NULL	NULL	NULL	NULL	2	
 2	DEPENDENT SUBQUERY	Y	ALL	NULL	NULL	NULL	NULL	2	Using where
-2	DEPENDENT SUBQUERY	subselect3	eq_ref	unique_key	unique_key	5	func	1	
+2	DEPENDENT SUBQUERY	SUBQUERY#3	eq_ref	unique_key	unique_key	5	func	1	
 3	SUBQUERY	Z	ALL	NULL	NULL	NULL	NULL	2	
 select (select max(Y.a) from t1 Y where a in (select a from t1 Z) and a < X.a) as subq from t1 X;
 subq
@@ -1163,7 +1163,7 @@ create table t3 ( a int , filler char(100), key(a));
 insert into t3 select A.a + 10*B.a, 'filler' from t0 A, t0 B;
 explain select * from t3 where a in (select a from t2) and (a > 5 or a < 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	2	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	2	
 1	PRIMARY	t3	ref	a	a	5	test.t2.a	1	Using join buffer
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 select * from t3 where a in (select a from t2);
@@ -1212,29 +1212,33 @@ insert into t3 select A.a + 10*B.a, A.a + 10*B.a, 'filler' from t1 A, t1 B, t1 C
 explain select * from t1, t3 where t3.a in (select a from t2) and (t3.a < 10 or t3.a >30) and t1.a =3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	10	Using where
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	10	
 1	PRIMARY	t3	ref	a	a	5	test.t2.a	10	Using join buffer
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where
 explain select straight_join * from t1 A, t1 B where A.a in (select a from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	A	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	PRIMARY	A	ALL	NULL	NULL	NULL	NULL	10	
 1	PRIMARY	B	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.A.a	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	10	
 explain select * from t2 where a in (select straight_join A.a from t1 A, t1 B);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.t2.a	1	
 2	SUBQUERY	A	ALL	NULL	NULL	NULL	NULL	10	
 2	SUBQUERY	B	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
 explain select * from t2 where a in (select straight_join A.a from t1 A, t1 B);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.t2.a	1	
 2	SUBQUERY	A	ALL	NULL	NULL	NULL	NULL	10	
 2	SUBQUERY	B	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
 explain select straight_join * from t2 X, t2 Y 
 where X.a in (select straight_join A.a from t1 A, t1 B);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	X	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	PRIMARY	X	ALL	NULL	NULL	NULL	NULL	10	
 1	PRIMARY	Y	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.X.a	1	
 2	SUBQUERY	A	ALL	NULL	NULL	NULL	NULL	10	
 2	SUBQUERY	B	ALL	NULL	NULL	NULL	NULL	10	Using join buffer
 create table t0 (a int, b int);
@@ -1242,14 +1246,14 @@ insert into t0 values(1,1);
 explain select * from t0, t3 where t3.a in (select a from t2) and (t3.a < 10 or t3.a >30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t0	system	NULL	NULL	NULL	NULL	1	
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	10	
 1	PRIMARY	t3	ref	a	a	5	test.t2.a	10	Using join buffer
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where
 create table t4 as select a as x, a as y from t1;
 explain select * from t0, t3 where (t3.a, t3.b) in (select x,y from t4) and (t3.a < 10 or t3.a >30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t0	system	NULL	NULL	NULL	NULL	1	
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	10	
 1	PRIMARY	t3	ref	a	a	5	test.t4.x	10	Using where; Using join buffer
 2	SUBQUERY	t4	ALL	NULL	NULL	NULL	NULL	10	Using where
 drop table t0,t1,t2,t3,t4;
@@ -1275,14 +1279,14 @@ set @@optimizer_switch='firstmatch=off';
 explain select * from t1 where (a,b) in (select a,b from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	10	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	10	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	10	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	100	
 set @save_optimizer_search_depth=@@optimizer_search_depth;
 set @@optimizer_search_depth=63;
 explain select * from t1 where (a,b) in (select a,b from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	10	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	10	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	10	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	100	
 set @@optimizer_search_depth=@save_optimizer_search_depth;
 set @@optimizer_switch=default;
@@ -1321,7 +1325,7 @@ insert into t2 select * from t2;
 explain select * from t1 where (a,b,c) in (select X.a, Y.a, Z.a from t2 X, t2 Y, t2 Z where X.b=33);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	15	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	15	func	1	
 2	SUBQUERY	X	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	Y	ALL	NULL	NULL	NULL	NULL	6	Using join buffer
 2	SUBQUERY	Z	ALL	NULL	NULL	NULL	NULL	6	Using join buffer
@@ -1394,7 +1398,7 @@ INNER JOIN t2 c ON c.idContact=cona.idContact
 WHERE cona.postalStripped='T2H3B2'
 	);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	2	1.00	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	2	1.00	
 1	PRIMARY	a	index	PRIMARY	PRIMARY	4	NULL	2	100.00	Using where; Using index; Using join buffer
 2	SUBQUERY	cona	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 2	SUBQUERY	c	eq_ref	PRIMARY	PRIMARY	4	test.cona.idContact	1	100.00	Using join buffer
diff --git a/mysql-test/r/subselect4.result b/mysql-test/r/subselect4.result
index 2956587d83f..7aaa5ae4ad9 100644
--- a/mysql-test/r/subselect4.result
+++ b/mysql-test/r/subselect4.result
@@ -216,7 +216,7 @@ FROM t2
 WHERE PTYPE = 'Design'));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
@@ -231,13 +231,13 @@ WHERE EMPNUM IN
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
-1	SIMPLE	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	SIMPLE	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 DEALLOCATE PREPARE stmt;
@@ -254,7 +254,7 @@ FROM t2
 WHERE PTYPE = 'Design'));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
@@ -269,13 +269,13 @@ WHERE EMPNUM IN
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	t1_IDX	NULL	NULL	NULL	5	
-1	SIMPLE	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	SIMPLE	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 DEALLOCATE PREPARE stmt;
@@ -291,7 +291,7 @@ FROM t2
 WHERE PTYPE = 'Design'));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 PREPARE stmt FROM "EXPLAIN SELECT EMPNAME
@@ -306,13 +306,13 @@ WHERE EMPNUM IN
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	5	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
-1	SIMPLE	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	SIMPLE	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer
 DEALLOCATE PREPARE stmt;
diff --git a/mysql-test/r/subselect_mat.result b/mysql-test/r/subselect_mat.result
index 823025cf0d6..316ea1e756e 100644
--- a/mysql-test/r/subselect_mat.result
+++ b/mysql-test/r/subselect_mat.result
@@ -38,10 +38,11 @@ set @@optimizer_switch='semijoin=off';
 explain extended
 select * from t1 where a1 in (select b1 from t2 where b1 > '0');
 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	9	test.t1.a1	1	100.00	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a1`,`test`.`t1`.`a1` in ( <materialize> (select `test`.`t2`.`b1` AS `b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`b1`)))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t2`.`b1` AS `b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0')) join `test`.`t1` where (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`)
 select * from t1 where a1 in (select b1 from t2 where b1 > '0');
 a1	a2
 1 - 01	2 - 01
@@ -49,10 +50,11 @@ a1	a2
 explain extended
 select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	9	test.t1.a1	1	100.00	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where; Using temporary; Using filesort
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a1`,`test`.`t1`.`a1` in ( <materialize> (select `test`.`t2`.`b1` AS `b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`b1`)))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t2`.`b1` AS `b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`) join `test`.`t1` where (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`)
 select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
 a1	a2
 1 - 01	2 - 01
@@ -60,10 +62,11 @@ a1	a2
 explain extended
 select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	18	test.t1.a1,test.t1.a2	1	100.00	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where; Using temporary; Using filesort
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`,`test`.`t2`.`b2` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1`.`a2` = `materialized subselect`.`b2`)))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`,`test`.`t2`.`b2`) join `test`.`t1` where ((`SUBQUERY#2`.`b2` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
 select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
 a1	a2
 1 - 01	2 - 01
@@ -71,10 +74,11 @@ a1	a2
 explain extended
 select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	18	test.t1.a1,test.t1.a2	1	100.00	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where; Using temporary; Using filesort
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,min(`test`.`t2`.`b2`) AS `min(b2)` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1`.`a2` = `materialized subselect`.`min(b2)`)))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t2`.`b1` AS `b1`,min(`test`.`t2`.`b2`) AS `min(b2)` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`) join `test`.`t1` where ((`SUBQUERY#2`.`min(b2)` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
 select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
 a1	a2
 1 - 01	2 - 01
@@ -82,10 +86,11 @@ a1	a2
 explain extended
 select * from t1i where a1 in (select b1 from t2i where b1 > '0');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1i	index	NULL	it1i3	18	NULL	3	100.00	Using where; Using index
+1	PRIMARY	t1i	index	it1i1,it1i3	it1i3	18	NULL	3	100.00	Using index
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	9	test.t1i.a1	1	100.00	
 2	SUBQUERY	t2i	index	it2i1,it2i3	it2i1	9	NULL	5	100.00	Using where; Using index
 Warnings:
-Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>(`test`.`t1i`.`a1`,`test`.`t1i`.`a1` in ( <materialize> (select `test`.`t2i`.`b1` AS `b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `materialized subselect`.`b1`)))))
+Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0')) join `test`.`t1i` where (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`)
 select * from t1i where a1 in (select b1 from t2i where b1 > '0');
 a1	a2
 1 - 01	2 - 01
@@ -93,10 +98,11 @@ a1	a2
 explain extended
 select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1i	index	NULL	it1i3	18	NULL	3	100.00	Using where; Using index
-2	SUBQUERY	t2i	range	it2i1,it2i3	it2i1	9	NULL	3	100.00	Using where; Using index for group-by
+1	PRIMARY	SUBQUERY#2	ALL	distinct_key	#	NULL	#	3	100.00	#
+1	PRIMARY	t1i	ref	it1i1,it1i3	#	9	#	1	100.00	#
+2	SUBQUERY	t2i	range	it2i1,it2i3	#	9	#	3	100.00	#
 Warnings:
-Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>(`test`.`t1i`.`a1`,`test`.`t1i`.`a1` in ( <materialize> (select `test`.`t2i`.`b1` AS `b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `materialized subselect`.`b1`)))))
+Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`) join `test`.`t1i` where (`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`)
 select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
 a1	a2
 1 - 01	2 - 01
@@ -104,10 +110,11 @@ a1	a2
 explain extended
 select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1i	index	NULL	it1i3	18	NULL	3	100.00	Using where; Using index
+1	PRIMARY	t1i	index	it1i1,it1i2,it1i3	it1i3	18	NULL	3	100.00	Using index
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	18	test.t1i.a1,test.t1i.a2	1	100.00	
 2	SUBQUERY	t2i	index	it2i1,it2i3	it2i3	18	NULL	5	100.00	Using where; Using index
 Warnings:
-Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1i`.`a2` = `materialized subselect`.`b2`)))))
+Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0')) join `test`.`t1i` where ((`SUBQUERY#2`.`b2` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
 select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
 a1	a2
 1 - 01	2 - 01
@@ -115,10 +122,11 @@ a1	a2
 explain extended
 select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1i	index	NULL	it1i3	18	NULL	3	100.00	Using where; Using index
-2	SUBQUERY	t2i	range	it2i1,it2i3	it2i3	18	NULL	3	100.00	Using where; Using index for group-by
+1	PRIMARY	t1i	index	it1i1,it1i2,it1i3	#	#	#	3	100.00	#
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	#	#	#	1	100.00	#
+2	SUBQUERY	t2i	range	it2i1,it2i3	#	#	#	3	100.00	#
 Warnings:
-Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`,`test`.`t2i`.`b2` ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1i`.`a2` = `materialized subselect`.`b2`)))))
+Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`,`test`.`t2i`.`b2`) join `test`.`t1i` where ((`SUBQUERY#2`.`b2` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
 select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
 a1	a2
 1 - 01	2 - 01
@@ -126,10 +134,11 @@ a1	a2
 explain extended
 select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1i	index	NULL	it1i3	18	NULL	3	100.00	Using where; Using index
-2	SUBQUERY	t2i	range	it2i1,it2i3	it2i3	18	NULL	3	100.00	Using where; Using index for group-by
+1	PRIMARY	t1i	index	it1i1,it1i2,it1i3	#	#	#	3	100.00	#
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	#	#	#	1	100.00	#
+2	SUBQUERY	t2i	range	it2i1,it2i3	#	#	#	3	100.00	#
 Warnings:
-Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,min(`test`.`t2i`.`b2`) AS `min(b2)` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1i`.`a2` = `materialized subselect`.`min(b2)`)))))
+Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,min(`test`.`t2i`.`b2`) AS `min(b2)` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`) join `test`.`t1i` where ((`SUBQUERY#2`.`min(b2)` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
 select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
 a1	a2
 1 - 01	2 - 01
@@ -137,10 +146,11 @@ a1	a2
 explain extended
 select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1);
 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	18	test.t1.a1,test.t1.a2	1	100.00	
 2	SUBQUERY	t2i	range	NULL	it2i3	9	NULL	3	100.00	Using index for group-by
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,max(`test`.`t2i`.`b2`) AS `max(b2)` from `test`.`t2i` group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1`.`a2` = `materialized subselect`.`max(b2)`)))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,max(`test`.`t2i`.`b2`) AS `max(b2)` from `test`.`t2i` group by `test`.`t2i`.`b1`) join `test`.`t1` where ((`SUBQUERY#2`.`max(b2)` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
 select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1);
 a1	a2
 1 - 01	2 - 01
@@ -148,11 +158,13 @@ a1	a2
 prepare st1 from "explain select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)";
 execute st1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	18	test.t1.a1,test.t1.a2	1	
 2	SUBQUERY	t2i	range	NULL	it2i3	9	NULL	3	Using index for group-by
 execute st1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	18	test.t1.a1,test.t1.a2	1	
 2	SUBQUERY	t2i	range	NULL	it2i3	9	NULL	3	Using index for group-by
 prepare st2 from "select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)";
 execute st2;
@@ -166,10 +178,11 @@ a1	a2
 explain extended
 select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	18	test.t1.a1,test.t1.a2	1	100.00	
 2	SUBQUERY	t2i	range	it2i1,it2i3	it2i3	18	NULL	3	100.00	Using where; Using index for group-by
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,min(`test`.`t2i`.`b2`) AS `min(b2)` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1`.`a2` = `materialized subselect`.`min(b2)`)))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,min(`test`.`t2i`.`b2`) AS `min(b2)` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`) join `test`.`t1` where ((`SUBQUERY#2`.`min(b2)` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
 select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
 a1	a2
 1 - 01	2 - 01
@@ -206,10 +219,11 @@ set @@optimizer_switch='default,semijoin=off';
 explain extended
 select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	18	test.t1.a1,test.t1.a2	1	100.00	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` order by `test`.`t2`.`b1`,`test`.`t2`.`b2` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1`.`a2` = `materialized subselect`.`b2`)))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` order by `test`.`t2`.`b1`,`test`.`t2`.`b2`) join `test`.`t1` where ((`SUBQUERY#2`.`b2` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
 select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
 a1	a2
 1 - 01	2 - 01
@@ -217,10 +231,11 @@ a1	a2
 explain extended
 select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1i	index	NULL	it1i3	18	NULL	3	100.00	Using where; Using index
+1	PRIMARY	t1i	index	it1i1,it1i2,it1i3	it1i3	18	NULL	3	100.00	Using index
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	18	test.t1i.a1,test.t1i.a2	1	100.00	
 2	SUBQUERY	t2i	index	NULL	it2i3	18	NULL	5	100.00	Using index
 Warnings:
-Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` order by `test`.`t2i`.`b1`,`test`.`t2i`.`b2` ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1i`.`a2` = `materialized subselect`.`b2`)))))
+Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` order by `test`.`t2i`.`b1`,`test`.`t2i`.`b2`) join `test`.`t1i` where ((`SUBQUERY#2`.`b2` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
 select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
 a1	a2
 1 - 01	2 - 01
@@ -270,12 +285,15 @@ where (a1, a2) in (select b1, b2 from t2 where b1 >  '0') and
 (a1, a2) in (select c1, c2 from t3
 where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
 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
-3	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
+1	PRIMARY	SUBQUERY#2	ALL	distinct_key	NULL	NULL	NULL	5	0.00	
+1	PRIMARY	SUBQUERY#3	eq_ref	distinct_key	distinct_key	18	SUBQUERY#2.b1,SUBQUERY#2.b2	1	100.00	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+3	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	
+3	SUBQUERY	SUBQUERY#4	eq_ref	distinct_key	distinct_key	18	test.t3.c1,test.t3.c2	1	100.00	
 4	SUBQUERY	t2i	index	it2i2	it2i3	18	NULL	5	100.00	Using where; Using index
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1`.`a2` = `materialized subselect`.`b2`))))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `materialized subselect`.`b1`) and (`test`.`t3`.`c2` = `materialized subselect`.`b2`))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`c1`) and (`test`.`t1`.`a2` = `materialized subselect`.`c2`))))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` where ((`SUBQUERY#4`.`b2` = `test`.`t3`.`c2`) and (`SUBQUERY#4`.`b1` = `test`.`t3`.`c1`))) join  <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0')) join `test`.`t1` where ((`SUBQUERY#3`.`c2` = `SUBQUERY#2`.`b2`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`) and (`SUBQUERY#3`.`c1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`))
 select * from t1
 where (a1, a2) in (select b1, b2 from t2 where b1 >  '0') and
 (a1, a2) in (select c1, c2 from t3
@@ -289,12 +307,15 @@ where (a1, a2) in (select b1, b2 from t2i where b1 >  '0') and
 (a1, a2) in (select c1, c2 from t3i
 where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1i	index	NULL	it1i3	18	NULL	3	100.00	Using where; Using index
-3	SUBQUERY	t3i	index	NULL	it3i3	18	NULL	4	100.00	Using where; Using index
-4	SUBQUERY	t2i	index	it2i2	it2i3	18	NULL	5	100.00	Using where; Using index
-2	SUBQUERY	t2i	index	it2i1,it2i3	it2i3	18	NULL	5	100.00	Using where; Using index
+1	PRIMARY	SUBQUERY#2	ALL	distinct_key	#	#	#	5	0.00	#
+1	PRIMARY	SUBQUERY#3	eq_ref	distinct_key	#	#	#	1	100.00	#
+1	PRIMARY	t1i	ref	it1i1,it1i2,it1i3	#	#	#	1	100.00	#
+3	SUBQUERY	t3i	index	it3i1,it3i2,it3i3	#	#	#	4	100.00	#
+3	SUBQUERY	SUBQUERY#4	eq_ref	distinct_key	#	#	#	1	100.00	#
+4	SUBQUERY	t2i	index	it2i2	#	#	#	5	100.00	#
+2	SUBQUERY	t2i	index	it2i1,it2i3	#	#	#	5	100.00	#
 Warnings:
-Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where (<in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1i`.`a2` = `materialized subselect`.`b2`))))) and <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t3i`.`c1` AS `c1`,`test`.`t3i`.`c2` AS `c2` from `test`.`t3i` where <in_optimizer>((`test`.`t3i`.`c1`,`test`.`t3i`.`c2`),(`test`.`t3i`.`c1`,`test`.`t3i`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3i`.`c1` in <temporary table> on distinct_key where ((`test`.`t3i`.`c1` = `materialized subselect`.`b1`) and (`test`.`t3i`.`c2` = `materialized subselect`.`b2`))))) ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `materialized subselect`.`c1`) and (`test`.`t1i`.`a2` = `materialized subselect`.`c2`))))))
+Note	1003	select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from  <materialize> (select `test`.`t3i`.`c1` AS `c1`,`test`.`t3i`.`c2` AS `c2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3i` where ((`SUBQUERY#4`.`b2` = `test`.`t3i`.`c2`) and (`SUBQUERY#4`.`b1` = `test`.`t3i`.`c1`))) join  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0')) join `test`.`t1i` where ((`SUBQUERY#3`.`c2` = `SUBQUERY#2`.`b2`) and (`test`.`t1i`.`a2` = `SUBQUERY#2`.`b2`) and (`SUBQUERY#3`.`c1` = `SUBQUERY#2`.`b1`) and (`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`))
 select * from t1i
 where (a1, a2) in (select b1, b2 from t2i where b1 >  '0') and
 (a1, a2) in (select c1, c2 from t3i
@@ -310,14 +331,17 @@ b2 in (select c2 from t3 where c2 LIKE '%03')) and
 (a1, a2) in (select c1, c2 from t3
 where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
 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
-5	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
+1	PRIMARY	SUBQUERY#2	ALL	distinct_key	NULL	NULL	NULL	5	0.00	
+1	PRIMARY	SUBQUERY#5	eq_ref	distinct_key	distinct_key	18	SUBQUERY#2.b1,SUBQUERY#2.b2	1	100.00	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer
+5	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	
+5	SUBQUERY	SUBQUERY#6	eq_ref	distinct_key	distinct_key	18	test.t3.c1,test.t3.c2	1	100.00	
 6	SUBQUERY	t2i	index	it2i2	it2i3	18	NULL	5	100.00	Using where; Using index
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where
 4	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 3	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `materialized subselect`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `materialized subselect`.`c2`)))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1`.`a2` = `materialized subselect`.`b2`))))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `materialized subselect`.`b1`) and (`test`.`t3`.`c2` = `materialized subselect`.`b2`))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`c1`) and (`test`.`t1`.`a2` = `materialized subselect`.`c2`))))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` where ((`SUBQUERY#6`.`b2` = `test`.`t3`.`c2`) and (`SUBQUERY#6`.`b1` = `test`.`t3`.`c1`))) join  <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#3`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`))))))) join `test`.`t1` where ((`SUBQUERY#5`.`c2` = `SUBQUERY#2`.`b2`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`) and (`SUBQUERY#5`.`c1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`))
 select * from t1
 where (a1, a2) in (select b1, b2 from t2
 where b2 in (select c2 from t3 where c2 LIKE '%02') or
@@ -335,14 +359,16 @@ b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
 where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
 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
-5	SUBQUERY	t3c	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
+1	PRIMARY	SUBQUERY#5	eq_ref	distinct_key	distinct_key	18	test.t1.a1,test.t1.a2	1	100.00	
+5	SUBQUERY	t3c	ALL	NULL	NULL	NULL	NULL	4	100.00	
+5	SUBQUERY	SUBQUERY#6	eq_ref	distinct_key	distinct_key	18	test.t3c.c1,test.t3c.c2	1	100.00	
 6	SUBQUERY	t2i	index	it2i2	it2i3	18	NULL	5	100.00	Using where; Using index
 2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where
 4	SUBQUERY	t3b	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 3	DEPENDENT SUBQUERY	t3a	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 Warnings:
 Note	1276	Field or reference 'test.t1.a1' of SELECT #3 was resolved in SELECT #1
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((<in_optimizer>(`test`.`t2`.`b2`,<exists>(select 1 AS `Not_used` from `test`.`t3` `t3a` where ((`test`.`t3a`.`c1` = `test`.`t1`.`a1`) and (<cache>(`test`.`t2`.`b2`) = `test`.`t3a`.`c2`)))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3b`.`c2` AS `c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `materialized subselect`.`c2`)))))) and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t3c`.`c1` AS `c1`,`test`.`t3c`.`c2` AS `c2` from `test`.`t3` `t3c` where <in_optimizer>((`test`.`t3c`.`c1`,`test`.`t3c`.`c2`),(`test`.`t3c`.`c1`,`test`.`t3c`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3c`.`c1` in <temporary table> on distinct_key where ((`test`.`t3c`.`c1` = `materialized subselect`.`b1`) and (`test`.`t3c`.`c2` = `materialized subselect`.`b2`))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`c1`) and (`test`.`t1`.`a2` = `materialized subselect`.`c2`))))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t3c`.`c1` AS `c1`,`test`.`t3c`.`c2` AS `c2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` `t3c` where ((`SUBQUERY#6`.`b2` = `test`.`t3c`.`c2`) and (`SUBQUERY#6`.`b1` = `test`.`t3c`.`c1`))) join `test`.`t1` where ((`SUBQUERY#5`.`c2` = `test`.`t1`.`a2`) and (`SUBQUERY#5`.`c1` = `test`.`t1`.`a1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((<in_optimizer>(`test`.`t2`.`b2`,<exists>(select 1 AS `Not_used` from `test`.`t3` `t3a` where ((`test`.`t3a`.`c1` = `test`.`t1`.`a1`) and (<cache>(`test`.`t2`.`b2`) = `test`.`t3a`.`c2`)))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3b`.`c2` AS `c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))))
 select * from t1
 where (a1, a2) in (select b1, b2 from t2
 where b2 in (select c2 from t3 t3a where c1 = a1) or
@@ -366,19 +392,25 @@ where (a1, a2) in (select b1, b2 from t2i where b1 >  '0') and
 (a1, a2) in (select c1, c2 from t3i
 where (c1, c2) in (select b1, b2 from t2i where b2 > '0')));
 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
-5	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
-6	SUBQUERY	t2i	index	it2i2	it2i3	18	NULL	5	100.00	Using where; Using index
-2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where; Using temporary; Using filesort
-4	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
-3	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
-7	UNION	t1i	index	NULL	it1i3	18	NULL	3	100.00	Using where; Using index
-9	SUBQUERY	t3i	index	NULL	it3i3	18	NULL	4	100.00	Using where; Using index
-10	SUBQUERY	t2i	index	it2i2	it2i3	18	NULL	5	100.00	Using where; Using index
-8	SUBQUERY	t2i	index	it2i1,it2i3	it2i3	18	NULL	5	100.00	Using where; Using index
-NULL	UNION RESULT	<union1,7>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
+1	PRIMARY	SUBQUERY#2	ALL	distinct_key	#	#	#	5	0.00	#
+1	PRIMARY	SUBQUERY#5	eq_ref	distinct_key	#	#	#	1	100.00	#
+1	PRIMARY	t1	ALL	NULL	#	#	#	3	100.00	#
+5	SUBQUERY	t3	ALL	NULL	#	#	#	4	100.00	#
+5	SUBQUERY	SUBQUERY#6	eq_ref	distinct_key	#	#	#	1	100.00	#
+6	SUBQUERY	t2i	index	it2i2	#	#	#	5	100.00	#
+2	SUBQUERY	t2	ALL	NULL	#	#	#	5	100.00	#
+4	SUBQUERY	t3	ALL	NULL	#	#	#	4	100.00	#
+3	SUBQUERY	t3	ALL	NULL	#	#	#	4	100.00	#
+7	UNION	SUBQUERY#8	ALL	distinct_key	#	#	#	5	0.00	#
+7	UNION	SUBQUERY#9	eq_ref	distinct_key	#	#	#	1	100.00	#
+7	UNION	t1i	ref	it1i1,it1i2,it1i3	#	#	#	1	100.00	#
+9	SUBQUERY	t3i	index	it3i1,it3i2,it3i3	#	#	#	4	100.00	#
+9	SUBQUERY	SUBQUERY#10	eq_ref	distinct_key	#	#	#	1	100.00	#
+10	SUBQUERY	t2i	index	it2i2	#	#	#	5	100.00	#
+8	SUBQUERY	t2i	index	it2i1,it2i3	#	#	#	5	100.00	#
+NULL	UNION RESULT	<union1,7>	ALL	NULL	#	#	#	NULL	NULL	#
 Warnings:
-Note	1003	(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `materialized subselect`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `materialized subselect`.`c2`)))))) group by `test`.`t2`.`b1`,`test`.`t2`.`b2` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1`.`a2` = `materialized subselect`.`b2`))))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `materialized subselect`.`b1`) and (`test`.`t3`.`c2` = `materialized subselect`.`b2`))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`c1`) and (`test`.`t1`.`a2` = `materialized subselect`.`c2`))))))) union (select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where (<in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1i`.`a2` = `materialized subselect`.`b2`))))) and <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t3i`.`c1` AS `c1`,`test`.`t3i`.`c2` AS `c2` from `test`.`t3i` where <in_optimizer>((`test`.`t3i`.`c1`,`test`.`t3i`.`c2`),(`test`.`t3i`.`c1`,`test`.`t3i`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3i`.`c1` in <temporary table> on distinct_key where ((`test`.`t3i`.`c1` = `materialized subselect`.`b1`) and (`test`.`t3i`.`c2` = `materialized subselect`.`b2`))))) ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `materialized subselect`.`c1`) and (`test`.`t1i`.`a2` = `materialized subselect`.`c2`)))))))
+Note	1003	(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` where ((`SUBQUERY#6`.`b2` = `test`.`t3`.`c2`) and (`SUBQUERY#6`.`b1` = `test`.`t3`.`c1`))) join  <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#3`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) group by `test`.`t2`.`b1`,`test`.`t2`.`b2`) join `test`.`t1` where ((`SUBQUERY#5`.`c2` = `SUBQUERY#2`.`b2`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`) and (`SUBQUERY#5`.`c1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`))) union (select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from  <materialize> (select `test`.`t3i`.`c1` AS `c1`,`test`.`t3i`.`c2` AS `c2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3i` where ((`SUBQUERY#10`.`b2` = `test`.`t3i`.`c2`) and (`SUBQUERY#10`.`b1` = `test`.`t3i`.`c1`))) join  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0')) join `test`.`t1i` where ((`SUBQUERY#9`.`c2` = `SUBQUERY#8`.`b2`) and (`test`.`t1i`.`a2` = `SUBQUERY#8`.`b2`) and (`SUBQUERY#9`.`c1` = `SUBQUERY#8`.`b1`) and (`test`.`t1i`.`a1` = `SUBQUERY#8`.`b1`)))
 (select * from t1
 where (a1, a2) in (select b1, b2 from t2
 where b2 in (select c2 from t3 where c2 LIKE '%02') or
@@ -401,13 +433,15 @@ where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where
 where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
 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
-4	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
+1	PRIMARY	SUBQUERY#4	eq_ref	distinct_key	distinct_key	18	test.t1.a1,test.t1.a2	1	100.00	
+4	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	
+4	SUBQUERY	SUBQUERY#5	eq_ref	distinct_key	distinct_key	18	test.t3.c1,test.t3.c2	1	100.00	
 5	SUBQUERY	t2i	index	it2i2	it2i3	18	NULL	5	100.00	Using where; Using index
 2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 3	DEPENDENT UNION	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where
 NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `materialized subselect`.`b1`) and (`test`.`t3`.`c2` = `materialized subselect`.`b2`))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `materialized subselect`.`c1`) and (`test`.`t1`.`a2` = `materialized subselect`.`c2`))))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from  <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` where ((`SUBQUERY#5`.`b2` = `test`.`t3`.`c2`) and (`SUBQUERY#5`.`b1` = `test`.`t3`.`c1`))) join `test`.`t1` where ((`SUBQUERY#4`.`c2` = `test`.`t1`.`a2`) and (`SUBQUERY#4`.`c1` = `test`.`t1`.`a1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))))
 select * from t1
 where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
 (a1, a2) in (select c1, c2 from t3
@@ -423,14 +457,16 @@ where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
 a1 = c1;
 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
+1	PRIMARY	SUBQUERY#4	ALL	distinct_key	NULL	NULL	NULL	4	75.00	Using where; Using join buffer
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where; Using join buffer
-4	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
+4	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	
+4	SUBQUERY	SUBQUERY#5	eq_ref	distinct_key	distinct_key	18	test.t3.c1,test.t3.c2	1	100.00	
 5	SUBQUERY	t2i	index	it2i2	it2i3	18	NULL	5	100.00	Using where; Using index
 2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 3	DEPENDENT UNION	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where
 NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t1` join `test`.`t3` where ((`test`.`t3`.`c1` = `test`.`t1`.`a1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `materialized subselect`.`b1`) and (`test`.`t3`.`c2` = `materialized subselect`.`b2`))))) ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `materialized subselect`.`c1`) and (`test`.`t3`.`c2` = `materialized subselect`.`c2`))))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from  <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from  <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` where ((`SUBQUERY#5`.`b2` = `test`.`t3`.`c2`) and (`SUBQUERY#5`.`b1` = `test`.`t3`.`c1`))) join `test`.`t1` join `test`.`t3` where ((`test`.`t3`.`c2` = `SUBQUERY#4`.`c2`) and (`SUBQUERY#4`.`c1` = `test`.`t1`.`a1`) and (`test`.`t3`.`c1` = `test`.`t1`.`a1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))))
 select * from t1, t3
 where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
 (c1, c2) in (select c1, c2 from t3
@@ -476,7 +512,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 Warnings:
 Note	1276	Field or reference 'test.t1.a1' of SELECT #3 was resolved in SELECT #1
 Note	1276	Field or reference 'test.t1.a2' of SELECT #6 was resolved in SELECT #1
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((<in_optimizer>(`test`.`t2`.`b2`,<exists>(select 1 AS `Not_used` from `test`.`t3` `t3a` where ((`test`.`t3a`.`c1` = `test`.`t1`.`a1`) and (<cache>(`test`.`t2`.`b2`) = `test`.`t3a`.`c2`)))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3b`.`c2` AS `c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `materialized subselect`.`c2`)))))) and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t3c`.`c1` AS `c1`,`test`.`t3c`.`c2` AS `c2` from `test`.`t3` `t3c` where (<in_optimizer>((`test`.`t3c`.`c1`,`test`.`t3c`.`c2`),<exists>(<index_lookup>(<cache>(`test`.`t3c`.`c1`) in t2i on it2i3 where (((`test`.`t2i`.`b2` > '0') or (`test`.`t2i`.`b2` = `test`.`t1`.`a2`)) and (<cache>(`test`.`t3c`.`c1`) = `test`.`t2i`.`b1`) and (<cache>(`test`.`t3c`.`c2`) = `test`.`t2i`.`b2`))))) and (<cache>(`test`.`t1`.`a1`) = `test`.`t3c`.`c1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t3c`.`c2`)))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((<in_optimizer>(`test`.`t2`.`b2`,<exists>(select 1 AS `Not_used` from `test`.`t3` `t3a` where ((`test`.`t3a`.`c1` = `test`.`t1`.`a1`) and (<cache>(`test`.`t2`.`b2`) = `test`.`t3a`.`c2`)))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3b`.`c2` AS `c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t3c`.`c1` AS `c1`,`test`.`t3c`.`c2` AS `c2` from `test`.`t3` `t3c` where (<in_optimizer>((`test`.`t3c`.`c1`,`test`.`t3c`.`c2`),<exists>(<index_lookup>(<cache>(`test`.`t3c`.`c1`) in t2i on it2i3 where (((`test`.`t2i`.`b2` > '0') or (`test`.`t2i`.`b2` = `test`.`t1`.`a2`)) and (<cache>(`test`.`t3c`.`c1`) = `test`.`t2i`.`b1`) and (<cache>(`test`.`t3c`.`c2`) = `test`.`t2i`.`b2`))))) and (<cache>(`test`.`t1`.`a1`) = `test`.`t3c`.`c1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t3c`.`c2`)))))
 explain extended
 select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
@@ -608,10 +644,11 @@ explain extended select left(a1,7), left(a2,7)
 from t1_16
 where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1_16	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	PRIMARY	t1_16	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	20	test.t1_16.a1	1	100.00	Using where
 2	SUBQUERY	t2_16	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 Warnings:
-Note	1003	select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` where <in_optimizer>(`test`.`t1_16`.`a1`,`test`.`t1_16`.`a1` in ( <materialize> (select substr(`test`.`t2_16`.`b1`,1,16) AS `substring(b1,1,16)` from `test`.`t2_16` where (`test`.`t2_16`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1_16`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_16`.`a1` = `materialized subselect`.`substring(b1,1,16)`)))))
+Note	1003	select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from  <materialize> (select substr(`test`.`t2_16`.`b1`,1,16) AS `substring(b1,1,16)` from `test`.`t2_16` where (`test`.`t2_16`.`b1` > '0')) join `test`.`t1_16` where (`test`.`t1_16`.`a1` = `SUBQUERY#2`.`substring(b1,1,16)`)
 select left(a1,7), left(a2,7)
 from t1_16
 where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');
@@ -637,10 +674,11 @@ explain extended select left(a1,7), left(a2,7)
 from t1_16
 where a1 in (select group_concat(b1) from t2_16 group by b2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1_16	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	PRIMARY	t1_16	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	261	test.t1_16.a1	1	100.00	Using where
 2	SUBQUERY	t2_16	ALL	NULL	NULL	NULL	NULL	3	100.00	Using filesort
 Warnings:
-Note	1003	select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` where <in_optimizer>(`test`.`t1_16`.`a1`,`test`.`t1_16`.`a1` in ( <materialize> (select group_concat(`test`.`t2_16`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_16` group by `test`.`t2_16`.`b2` ), <primary_index_lookup>(`test`.`t1_16`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_16`.`a1` = `materialized subselect`.`group_concat(b1)`)))))
+Note	1003	select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from  <materialize> (select group_concat(`test`.`t2_16`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_16` group by `test`.`t2_16`.`b2`) join `test`.`t1_16` where (`test`.`t1_16`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
 select left(a1,7), left(a2,7)
 from t1_16
 where a1 in (select group_concat(b1) from t2_16 group by b2);
@@ -660,9 +698,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 2	DEPENDENT SUBQUERY	t1_16	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 3	DEPENDENT SUBQUERY	t2_16	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 3	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where; Using join buffer
+3	DEPENDENT SUBQUERY	SUBQUERY#4	eq_ref	distinct_key	distinct_key	9	test.t2.b1	1	100.00	Using where
 4	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>(concat(`test`.`t1`.`a1`,'x'),<exists>(select 1 AS `Not_used` from `test`.`t1_16` where (<in_optimizer>((`test`.`t1_16`.`a1`,`test`.`t1_16`.`a2`),<exists>(select `test`.`t2_16`.`b1` AS `b1`,`test`.`t2_16`.`b2` AS `b2` from `test`.`t2_16` join `test`.`t2` where ((`test`.`t2`.`b2` = substr(`test`.`t2_16`.`b2`,1,6)) and <in_optimizer>(`test`.`t2`.`b1`,`test`.`t2`.`b1` in ( <materialize> (select `test`.`t3`.`c1` AS `c1` from `test`.`t3` where (`test`.`t3`.`c2` > '0') ), <primary_index_lookup>(`test`.`t2`.`b1` in <temporary table> on distinct_key where ((`test`.`t2`.`b1` = `materialized subselect`.`c1`))))) and (<cache>(`test`.`t1_16`.`a1`) = `test`.`t2_16`.`b1`) and (<cache>(`test`.`t1_16`.`a2`) = `test`.`t2_16`.`b2`)))) and (<cache>(concat(`test`.`t1`.`a1`,'x')) = left(`test`.`t1_16`.`a1`,8)))))
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>(concat(`test`.`t1`.`a1`,'x'),<exists>(select 1 AS `Not_used` from `test`.`t1_16` where (<in_optimizer>((`test`.`t1_16`.`a1`,`test`.`t1_16`.`a2`),<exists>(select `test`.`t2_16`.`b1` AS `b1`,`test`.`t2_16`.`b2` AS `b2` from  <materialize> (select `test`.`t3`.`c1` AS `c1` from `test`.`t3` where (`test`.`t3`.`c2` > '0')) join `test`.`t2_16` join `test`.`t2` where ((`SUBQUERY#4`.`c1` = `test`.`t2`.`b1`) and (`test`.`t2`.`b2` = substr(`test`.`t2_16`.`b2`,1,6)) and (<cache>(`test`.`t1_16`.`a1`) = `test`.`t2_16`.`b1`) and (<cache>(`test`.`t1_16`.`a2`) = `test`.`t2_16`.`b2`)))) and (<cache>(concat(`test`.`t1`.`a1`,'x')) = left(`test`.`t1_16`.`a1`,8)))))
 drop table t1_16, t2_16, t3_16;
 set @blob_len = 512;
 set @suffix_len = @blob_len - @prefix_len;
@@ -721,10 +760,11 @@ explain extended select left(a1,7), left(a2,7)
 from t1_512
 where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1_512	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	PRIMARY	t1_512	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	517	test.t1_512.a1	1	100.00	Using where
 2	SUBQUERY	t2_512	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 Warnings:
-Note	1003	select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where <in_optimizer>(`test`.`t1_512`.`a1`,`test`.`t1_512`.`a1` in ( <materialize> (select substr(`test`.`t2_512`.`b1`,1,512) AS `substring(b1,1,512)` from `test`.`t2_512` where (`test`.`t2_512`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1_512`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_512`.`a1` = `materialized subselect`.`substring(b1,1,512)`)))))
+Note	1003	select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from  <materialize> (select substr(`test`.`t2_512`.`b1`,1,512) AS `substring(b1,1,512)` from `test`.`t2_512` where (`test`.`t2_512`.`b1` > '0')) join `test`.`t1_512` where (`test`.`t1_512`.`a1` = `SUBQUERY#2`.`substring(b1,1,512)`)
 select left(a1,7), left(a2,7)
 from t1_512
 where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');
@@ -735,10 +775,11 @@ explain extended select left(a1,7), left(a2,7)
 from t1_512
 where a1 in (select group_concat(b1) from t2_512 group by b2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1_512	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	PRIMARY	t1_512	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	261	test.t1_512.a1	1	100.00	Using where
 2	SUBQUERY	t2_512	ALL	NULL	NULL	NULL	NULL	3	100.00	Using filesort
 Warnings:
-Note	1003	select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where <in_optimizer>(`test`.`t1_512`.`a1`,`test`.`t1_512`.`a1` in ( <materialize> (select group_concat(`test`.`t2_512`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_512` group by `test`.`t2_512`.`b2` ), <primary_index_lookup>(`test`.`t1_512`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_512`.`a1` = `materialized subselect`.`group_concat(b1)`)))))
+Note	1003	select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from  <materialize> (select group_concat(`test`.`t2_512`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_512` group by `test`.`t2_512`.`b2`) join `test`.`t1_512` where (`test`.`t1_512`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
 select left(a1,7), left(a2,7)
 from t1_512
 where a1 in (select group_concat(b1) from t2_512 group by b2);
@@ -748,10 +789,11 @@ explain extended select left(a1,7), left(a2,7)
 from t1_512
 where a1 in (select group_concat(b1) from t2_512 group by b2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1_512	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	PRIMARY	t1_512	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	261	test.t1_512.a1	1	100.00	Using where
 2	SUBQUERY	t2_512	ALL	NULL	NULL	NULL	NULL	3	100.00	Using filesort
 Warnings:
-Note	1003	select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where <in_optimizer>(`test`.`t1_512`.`a1`,`test`.`t1_512`.`a1` in ( <materialize> (select group_concat(`test`.`t2_512`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_512` group by `test`.`t2_512`.`b2` ), <primary_index_lookup>(`test`.`t1_512`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_512`.`a1` = `materialized subselect`.`group_concat(b1)`)))))
+Note	1003	select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from  <materialize> (select group_concat(`test`.`t2_512`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_512` group by `test`.`t2_512`.`b2`) join `test`.`t1_512` where (`test`.`t1_512`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
 select left(a1,7), left(a2,7)
 from t1_512
 where a1 in (select group_concat(b1) from t2_512 group by b2);
@@ -817,7 +859,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1_1024	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 2	DEPENDENT SUBQUERY	t2_1024	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 Warnings:
-Note	1003	select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where <in_optimizer>(`test`.`t1_1024`.`a1`,`test`.`t1_1024`.`a1` in (select 1 AS `Not_used` from `test`.`t2_1024` where ((`test`.`t2_1024`.`b1` > '0') and (<cache>(`test`.`t1_1024`.`a1`) = substr(`test`.`t2_1024`.`b1`,1,1024)))))
+Note	1003	select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where <in_optimizer>(`test`.`t1_1024`.`a1`,<exists>(select 1 AS `Not_used` from `test`.`t2_1024` where ((`test`.`t2_1024`.`b1` > '0') and (<cache>(`test`.`t1_1024`.`a1`) = substr(`test`.`t2_1024`.`b1`,1,1024)) and (<cache>(`test`.`t1_1024`.`a1`) = 1))))
 select left(a1,7), left(a2,7)
 from t1_1024
 where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0');
@@ -828,10 +870,11 @@ explain extended select left(a1,7), left(a2,7)
 from t1_1024
 where a1 in (select group_concat(b1) from t2_1024 group by b2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1_1024	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	PRIMARY	t1_1024	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	261	test.t1_1024.a1	1	100.00	Using where
 2	SUBQUERY	t2_1024	ALL	NULL	NULL	NULL	NULL	3	100.00	Using filesort
 Warnings:
-Note	1003	select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where <in_optimizer>(`test`.`t1_1024`.`a1`,`test`.`t1_1024`.`a1` in ( <materialize> (select group_concat(`test`.`t2_1024`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1024` group by `test`.`t2_1024`.`b2` ), <primary_index_lookup>(`test`.`t1_1024`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_1024`.`a1` = `materialized subselect`.`group_concat(b1)`)))))
+Note	1003	select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from  <materialize> (select group_concat(`test`.`t2_1024`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1024` group by `test`.`t2_1024`.`b2`) join `test`.`t1_1024` where (`test`.`t1_1024`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
 select left(a1,7), left(a2,7)
 from t1_1024
 where a1 in (select group_concat(b1) from t2_1024 group by b2);
@@ -841,10 +884,11 @@ explain extended select left(a1,7), left(a2,7)
 from t1_1024
 where a1 in (select group_concat(b1) from t2_1024 group by b2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1_1024	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	PRIMARY	t1_1024	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	261	test.t1_1024.a1	1	100.00	Using where
 2	SUBQUERY	t2_1024	ALL	NULL	NULL	NULL	NULL	3	100.00	Using filesort
 Warnings:
-Note	1003	select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where <in_optimizer>(`test`.`t1_1024`.`a1`,`test`.`t1_1024`.`a1` in ( <materialize> (select group_concat(`test`.`t2_1024`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1024` group by `test`.`t2_1024`.`b2` ), <primary_index_lookup>(`test`.`t1_1024`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_1024`.`a1` = `materialized subselect`.`group_concat(b1)`)))))
+Note	1003	select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from  <materialize> (select group_concat(`test`.`t2_1024`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1024` group by `test`.`t2_1024`.`b2`) join `test`.`t1_1024` where (`test`.`t1_1024`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
 select left(a1,7), left(a2,7)
 from t1_1024
 where a1 in (select group_concat(b1) from t2_1024 group by b2);
@@ -910,7 +954,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1_1025	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 2	DEPENDENT SUBQUERY	t2_1025	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 Warnings:
-Note	1003	select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where <in_optimizer>(`test`.`t1_1025`.`a1`,`test`.`t1_1025`.`a1` in (select 1 AS `Not_used` from `test`.`t2_1025` where ((`test`.`t2_1025`.`b1` > '0') and (<cache>(`test`.`t1_1025`.`a1`) = substr(`test`.`t2_1025`.`b1`,1,1025)))))
+Note	1003	select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where <in_optimizer>(`test`.`t1_1025`.`a1`,<exists>(select 1 AS `Not_used` from `test`.`t2_1025` where ((`test`.`t2_1025`.`b1` > '0') and (<cache>(`test`.`t1_1025`.`a1`) = substr(`test`.`t2_1025`.`b1`,1,1025)) and (<cache>(`test`.`t1_1025`.`a1`) = 1))))
 select left(a1,7), left(a2,7)
 from t1_1025
 where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0');
@@ -921,10 +965,11 @@ explain extended select left(a1,7), left(a2,7)
 from t1_1025
 where a1 in (select group_concat(b1) from t2_1025 group by b2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1_1025	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	PRIMARY	t1_1025	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	261	test.t1_1025.a1	1	100.00	Using where
 2	SUBQUERY	t2_1025	ALL	NULL	NULL	NULL	NULL	3	100.00	Using filesort
 Warnings:
-Note	1003	select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where <in_optimizer>(`test`.`t1_1025`.`a1`,`test`.`t1_1025`.`a1` in ( <materialize> (select group_concat(`test`.`t2_1025`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1025` group by `test`.`t2_1025`.`b2` ), <primary_index_lookup>(`test`.`t1_1025`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_1025`.`a1` = `materialized subselect`.`group_concat(b1)`)))))
+Note	1003	select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from  <materialize> (select group_concat(`test`.`t2_1025`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1025` group by `test`.`t2_1025`.`b2`) join `test`.`t1_1025` where (`test`.`t1_1025`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
 select left(a1,7), left(a2,7)
 from t1_1025
 where a1 in (select group_concat(b1) from t2_1025 group by b2);
@@ -934,10 +979,11 @@ explain extended select left(a1,7), left(a2,7)
 from t1_1025
 where a1 in (select group_concat(b1) from t2_1025 group by b2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1_1025	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	PRIMARY	t1_1025	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	261	test.t1_1025.a1	1	100.00	Using where
 2	SUBQUERY	t2_1025	ALL	NULL	NULL	NULL	NULL	3	100.00	Using filesort
 Warnings:
-Note	1003	select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where <in_optimizer>(`test`.`t1_1025`.`a1`,`test`.`t1_1025`.`a1` in ( <materialize> (select group_concat(`test`.`t2_1025`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1025` group by `test`.`t2_1025`.`b2` ), <primary_index_lookup>(`test`.`t1_1025`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_1025`.`a1` = `materialized subselect`.`group_concat(b1)`)))))
+Note	1003	select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from  <materialize> (select group_concat(`test`.`t2_1025`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1025` group by `test`.`t2_1025`.`b2`) join `test`.`t1_1025` where (`test`.`t1_1025`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
 select left(a1,7), left(a2,7)
 from t1_1025
 where a1 in (select group_concat(b1) from t2_1025 group by b2);
@@ -956,10 +1002,11 @@ explain extended select bin(a1), bin(a2)
 from t1bit
 where (a1, a2) in (select b1, b2 from t2bit);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1bit	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
+1	PRIMARY	t1bit	ALL	NULL	NULL	NULL	NULL	3	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	10	test.t1bit.a1,test.t1bit.a2	1	100.00	Using where
 2	SUBQUERY	t2bit	ALL	NULL	NULL	NULL	NULL	3	100.00	
 Warnings:
-Note	1003	select conv(`test`.`t1bit`.`a1`,10,2) AS `bin(a1)`,conv(`test`.`t1bit`.`a2`,10,2) AS `bin(a2)` from `test`.`t1bit` where <in_optimizer>((`test`.`t1bit`.`a1`,`test`.`t1bit`.`a2`),(`test`.`t1bit`.`a1`,`test`.`t1bit`.`a2`) in ( <materialize> (select `test`.`t2bit`.`b1` AS `b1`,`test`.`t2bit`.`b2` AS `b2` from `test`.`t2bit` ), <primary_index_lookup>(`test`.`t1bit`.`a1` in <temporary table> on distinct_key where ((`test`.`t1bit`.`a1` = `materialized subselect`.`b1`) and (`test`.`t1bit`.`a2` = `materialized subselect`.`b2`)))))
+Note	1003	select conv(`test`.`t1bit`.`a1`,10,2) AS `bin(a1)`,conv(`test`.`t1bit`.`a2`,10,2) AS `bin(a2)` from  <materialize> (select `test`.`t2bit`.`b1` AS `b1`,`test`.`t2bit`.`b2` AS `b2` from `test`.`t2bit`) join `test`.`t1bit` where ((`test`.`t1bit`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1bit`.`a2` = `SUBQUERY#2`.`b2`))
 select bin(a1), bin(a2)
 from t1bit
 where (a1, a2) in (select b1, b2 from t2bit);
@@ -1027,10 +1074,11 @@ insert into t3 values (30);
 explain extended
 select a from t1 where a in (select c from t2 where d >= 20);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	7	100.00	Using where
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	7	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	4	test.t1.a	1	100.00	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `materialized subselect`.`c`)))))
+Note	1003	select `test`.`t1`.`a` AS `a` from  <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20)) join `test`.`t1` where (`SUBQUERY#2`.`c` = `test`.`t1`.`a`)
 select a from t1 where a in (select c from t2 where d >= 20);
 a
 2
@@ -1041,10 +1089,11 @@ create index it1a on t1(a);
 explain extended
 select a from t1 where a in (select c from t2 where d >= 20);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1	index	NULL	it1a	4	NULL	7	100.00	Using where; Using index
+1	PRIMARY	t1	index	it1a	it1a	4	NULL	7	100.00	Using index
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	4	test.t1.a	1	100.00	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	6	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `materialized subselect`.`c`)))))
+Note	1003	select `test`.`t1`.`a` AS `a` from  <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20)) join `test`.`t1` where (`SUBQUERY#2`.`c` = `test`.`t1`.`a`)
 select a from t1 where a in (select c from t2 where d >= 20);
 a
 2
@@ -1055,10 +1104,11 @@ insert into t2 values (1,10);
 explain extended
 select a from t1 where a in (select c from t2 where d >= 20);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	t1	index	NULL	it1a	4	NULL	7	100.00	Using where; Using index
+1	PRIMARY	t1	index	it1a	it1a	4	NULL	7	100.00	Using index
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	4	test.t1.a	1	100.00	
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	7	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `materialized subselect`.`c`)))))
+Note	1003	select `test`.`t1`.`a` AS `a` from  <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20)) join `test`.`t1` where (`SUBQUERY#2`.`c` = `test`.`t1`.`a`)
 select a from t1 where a in (select c from t2 where d >= 20);
 a
 2
@@ -1071,7 +1121,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	index	NULL	it1a	4	NULL	7	100.00	Using index
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	7	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `materialized subselect`.`c`)))))
+Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `SUBQUERY#2`.`c`)))))
 select a from t1 group by a having a in (select c from t2 where d >= 20);
 a
 2
@@ -1083,7 +1133,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	index	NULL	it1a	4	NULL	7	100.00	Using index
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	7	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `materialized subselect`.`c`)))))
+Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `SUBQUERY#2`.`c`)))))
 select a from t1 group by a having a in (select c from t2 where d >= 20);
 a
 2
@@ -1138,10 +1188,12 @@ create table t2 (b1 int);
 insert into t1 values (5);
 explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
-2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
+1	PRIMARY	SUBQUERY#2	const	distinct_key	distinct_key	5	const	1	
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
 min(a1)
+NULL
 set @@optimizer_switch='default,materialization=off';
 explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1152,17 +1204,27 @@ min(a1)
 set @@optimizer_switch='default,semijoin=off';
 explain select min(a1) from t1 where 7 in (select b1 from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
-2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
+1	PRIMARY	SUBQUERY#2	const	distinct_key	distinct_key	5	const	1	
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 select min(a1) from t1 where 7 in (select b1 from t2);
 min(a1)
+NULL
 set @@optimizer_switch='default,materialization=off';
+# with MariaDB and MWL#90, this particular case is solved:
 explain select min(a1) from t1 where 7 in (select b1 from t2);
 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
 select min(a1) from t1 where 7 in (select b1 from t2);
 min(a1)
 NULL
+# but when we go around MWL#90 code, the problem still shows up:
+explain select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
+min(a1)
 drop table t1,t2;
 create table t1 (a char(2), b varchar(10));
 insert into t1 values ('a',  'aaa');
@@ -1170,7 +1232,8 @@ insert into t1 values ('aa', 'aaaa');
 set @@optimizer_switch='default,semijoin=off';
 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	NULL	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	3	test.t1.b	1	Using where
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	
 select a,b from t1 where b in (select a from t1);
 a	b
@@ -1190,7 +1253,7 @@ INSERT INTO t2 VALUES (13, 1.454);
 SET @@optimizer_switch='default,semijoin=on,materialization=on';
 EXPLAIN SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	2	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	2	
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where; Using join buffer
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	
 SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
@@ -1212,7 +1275,7 @@ SET @@optimizer_switch='default,semijoin=on,materialization=on';
 EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	5	func	1	
 2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Using MRR
 SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
 pk
diff --git a/mysql-test/r/subselect_no_semijoin.result b/mysql-test/r/subselect_no_semijoin.result
index df1e424afa5..2b4be4db3d6 100644
--- a/mysql-test/r/subselect_no_semijoin.result
+++ b/mysql-test/r/subselect_no_semijoin.result
@@ -1299,31 +1299,34 @@ a
 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	NULL	PRIMARY	4	NULL	4	100.00	Using where; Using index
+1	PRIMARY	SUBQUERY#2	ALL	distinct_key	NULL	NULL	NULL	4	100.00	
+1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	75.00	Using where; Using index; Using join buffer
 2	SUBQUERY	t1	index	NULL	PRIMARY	4	NULL	4	100.00	Using index
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `materialized subselect`.`a`)))))
+Note	1003	select `test`.`t2`.`a` AS `a` from  <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1`) join `test`.`t2` where (`test`.`t2`.`a` = `SUBQUERY#2`.`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	NULL	PRIMARY	4	NULL	4	100.00	Using where; Using index
+1	PRIMARY	SUBQUERY#2	ALL	distinct_key	NULL	NULL	NULL	4	100.00	
+1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	75.00	Using where; Using index; Using join buffer
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30) ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `materialized subselect`.`a`)))))
+Note	1003	select `test`.`t2`.`a` AS `a` from  <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30)) join `test`.`t2` where (`test`.`t2`.`a` = `SUBQUERY#2`.`a`)
 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	NULL	PRIMARY	4	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t2	index	PRIMARY	PRIMARY	4	NULL	4	100.00	Using index
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	4	test.t2.a	1	100.00	
 2	SUBQUERY	t3	index	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where; Using join buffer
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t3` where (`test`.`t1`.`b` = `test`.`t3`.`a`) ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `materialized subselect`.`a`)))))
+Note	1003	select `test`.`t2`.`a` AS `a` from  <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t3` where (`test`.`t1`.`b` = `test`.`t3`.`a`)) join `test`.`t2` where (`SUBQUERY#2`.`a` = `test`.`t2`.`a`)
 drop table t1, t2, t3;
 create table t1 (a int, b int, index a (a,b));
 create table t2 (a int, index a (a));
@@ -1342,31 +1345,34 @@ a
 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	NULL	a	5	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using index
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.t2.a	1	100.00	
 2	SUBQUERY	t1	index	NULL	a	10	NULL	10004	100.00	Using index
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `materialized subselect`.`a`)))))
+Note	1003	select `test`.`t2`.`a` AS `a` from  <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1`) join `test`.`t2` where (`SUBQUERY#2`.`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	NULL	a	5	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using index
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.t2.a	1	100.00	
 2	SUBQUERY	t1	index	NULL	a	10	NULL	10004	100.00	Using where; Using index
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30) ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `materialized subselect`.`a`)))))
+Note	1003	select `test`.`t2`.`a` AS `a` from  <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30)) join `test`.`t2` where (`SUBQUERY#2`.`a` = `test`.`t2`.`a`)
 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	NULL	a	5	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using index
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.t2.a	1	100.00	
 2	SUBQUERY	t3	index	a	a	5	NULL	3	100.00	Using index
 2	SUBQUERY	t1	index	NULL	a	10	NULL	10004	100.00	Using where; Using index; Using join buffer
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t3` where (`test`.`t1`.`b` = `test`.`t3`.`a`) ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `materialized subselect`.`a`)))))
+Note	1003	select `test`.`t2`.`a` AS `a` from  <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t3` where (`test`.`t1`.`b` = `test`.`t3`.`a`)) join `test`.`t2` where (`SUBQUERY#2`.`a` = `test`.`t2`.`a`)
 insert into t1 values (3,31);
 select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 a
@@ -1379,10 +1385,11 @@ a
 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	NULL	a	5	NULL	4	100.00	Using where; Using index
+1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using index
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.t2.a	1	100.00	
 2	SUBQUERY	t1	index	NULL	a	10	NULL	10005	100.00	Using where; Using index
 Warnings:
-Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30) ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `materialized subselect`.`a`)))))
+Note	1003	select `test`.`t2`.`a` AS `a` from  <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30)) join `test`.`t2` where (`SUBQUERY#2`.`a` = `test`.`t2`.`a`)
 drop table t0, t1, t2, t3;
 create table t1 (a int, b int);
 create table t2 (a int, b int);
@@ -2833,10 +2840,11 @@ Warnings:
 Note	1003	select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two`,<in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),<exists>(select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where ((`test`.`t2`.`flag` = '0') and trigcond(((<cache>(`test`.`t1`.`one`) = `test`.`t2`.`one`) or isnull(`test`.`t2`.`one`))) and 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	Using where
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	8	100.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	10	test.t1.one,test.t1.two	1	100.00	
 2	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` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),(`test`.`t1`.`one`,`test`.`t1`.`two`) in ( <materialize> (select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where (`test`.`t2`.`flag` = 'N') ), <primary_index_lookup>(`test`.`t1`.`one` in <temporary table> on distinct_key where ((`test`.`t1`.`one` = `materialized subselect`.`one`) and (`test`.`t1`.`two` = `materialized subselect`.`two`)))))
+Note	1003	select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two` from  <materialize> (select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where (`test`.`t2`.`flag` = 'N')) join `test`.`t1` where ((`SUBQUERY#2`.`two` = `test`.`t1`.`two`) and (`SUBQUERY#2`.`one` = `test`.`t1`.`one`))
 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	
@@ -3421,7 +3429,8 @@ 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	t1	ALL	NULL	NULL	NULL	NULL	9	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	23	test.t1.a,test.t1.b	1	
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 ALTER TABLE t1 ADD INDEX(a);
 SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a);
@@ -3432,7 +3441,8 @@ 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	t1	ALL	a	NULL	NULL	NULL	9	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	23	test.t1.a,test.t1.b	1	
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 DROP TABLE t1;
 create table t1( f1 int,f2 int);
@@ -4206,7 +4216,8 @@ 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	NULL	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t1	ALL	I2	NULL	NULL	NULL	2	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	2	test.t1.b	1	Using where
 2	SUBQUERY	t1	index	NULL	I1	2	NULL	2	Using index
 SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1);
 a	b
@@ -4216,14 +4227,16 @@ 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	NULL	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t2	ALL	I2	NULL	NULL	NULL	2	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	5	test.t2.b	1	Using where
 2	SUBQUERY	t2	index	NULL	I1	4	NULL	2	Using index
 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	NULL	NULL	NULL	NULL	2	Using where
+1	PRIMARY	t1	ALL	I2	NULL	NULL	NULL	2	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	2	test.t1.b	1	Using where
 2	SUBQUERY	t1	index	NULL	I1	2	NULL	2	Using where; Using index
 SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1 WHERE LENGTH(a)<500);
 a	b
@@ -4326,16 +4339,18 @@ CREATE TABLE t1 (a INT);
 INSERT INTO t1 VALUES (1),(2);
 EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT 1 FROM t1 GROUP BY 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	SUBQUERY#2	const	distinct_key	distinct_key	4	const	1	100.00	
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
 Warnings:
-Note	1003	select 1 AS `1` from `test`.`t1` where <in_optimizer>(1,1 in ( <materialize> (select 1 AS `1` from `test`.`t1` group by `test`.`t1`.`a` ), <primary_index_lookup>(1 in <temporary table> on distinct_key where ((1 = `materialized subselect`.`1`)))))
+Note	1003	select 1 AS `1` from  <materialize> (select 1 AS `1` from `test`.`t1` group by `test`.`t1`.`a`) join `test`.`t1` where (`SUBQUERY#2`.`1` = 1)
 EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT 1 FROM t1 WHERE a > 3 GROUP BY 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
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	SUBQUERY#2	const	distinct_key	distinct_key	4	const	1	100.00	
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using temporary; Using filesort
 Warnings:
-Note	1003	select 1 AS `1` from `test`.`t1` where <in_optimizer>(1,1 in ( <materialize> (select 1 AS `1` from `test`.`t1` where (`test`.`t1`.`a` > 3) group by `test`.`t1`.`a` ), <primary_index_lookup>(1 in <temporary table> on distinct_key where ((1 = `materialized subselect`.`1`)))))
+Note	1003	select 1 AS `1` from  <materialize> (select 1 AS `1` from `test`.`t1` where (`test`.`t1`.`a` > 3) group by `test`.`t1`.`a`) join `test`.`t1` where (`SUBQUERY#2`.`1` = 1)
 DROP TABLE t1;
 #
 # Bug#45061: Incorrectly market field caused wrong result.
diff --git a/mysql-test/r/subselect_sj.result b/mysql-test/r/subselect_sj.result
index 1b7965442c0..ed6ae343171 100644
--- a/mysql-test/r/subselect_sj.result
+++ b/mysql-test/r/subselect_sj.result
@@ -848,7 +848,7 @@ INSERT INTO t2 VALUES (1,'i','iiii','iiii','iiii','iiii','ffff','ffff','ffff','f
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (a, b) IN (SELECT a, b FROM t2 WHERE pk > 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	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	13	func	1	1.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	13	func	1	1.00	
 2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using MRR
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`pk` > 0))
@@ -1017,7 +1017,7 @@ FROM t1
 WHERE `varchar_nokey`  < 'n' XOR `pk`  )   ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	18	100.00	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	8	func	1	1.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	8	func	1	1.00	
 2	SUBQUERY	t1	ALL	varchar_key	NULL	NULL	NULL	15	100.00	Using where
 Warnings:
 Note	1003	select `test`.`t2`.`varchar_nokey` AS `varchar_nokey` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`varchar_nokey` = `test`.`t1`.`varchar_key`) and ((`test`.`t1`.`varchar_nokey` < 'n') xor `test`.`t1`.`pk`))
diff --git a/mysql-test/r/subselect_sj2.result b/mysql-test/r/subselect_sj2.result
index f17edf3be6c..2b498ace622 100644
--- a/mysql-test/r/subselect_sj2.result
+++ b/mysql-test/r/subselect_sj2.result
@@ -32,7 +32,7 @@ a	b
 9	5
 explain select * from t2 where b in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	3	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	3	
 1	PRIMARY	t2	ref	b	b	5	test.t1.a	2	
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	
 select * from t2 where b in (select a from t1);
@@ -74,7 +74,7 @@ A.a + 10*B.a, A.a + 10*B.a, A.a + 10*B.a, A.a + 10*B.a
 from t0 A, t0 B where B.a <5;
 explain select * from t3 where b in (select a from t0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	10	
 1	PRIMARY	t3	ref	b	b	5	test.t0.a	1	
 2	SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	
 set @save_ecp= @@engine_condition_pushdown;
@@ -101,7 +101,7 @@ set max_heap_table_size= @save_max_heap_table_size;
 explain select * from t1 where a in (select b from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	5	func	1	
 2	SUBQUERY	t2	index	b	b	5	NULL	10	Using index
 select * from t1;
 a	b
@@ -129,7 +129,7 @@ explain select
 a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z 
 from t1 ot where a in (select a from t2 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	22	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	22	
 1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	32	Using where; Using join buffer
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	22	
 select 
@@ -163,7 +163,7 @@ a, mid(filler1, 1,10), length(filler1)=length(filler2)
 from t2 ot where a in (select a from t1 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	22	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	5	func	1	
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	32	
 select 
 a, mid(filler1, 1,10), length(filler1)=length(filler2) 
@@ -197,7 +197,7 @@ explain select
 a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z 
 from t1 ot where a in (select a from t2 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	22	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	22	
 1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	52	Using where; Using join buffer
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	22	
 select 
@@ -231,7 +231,7 @@ a, mid(filler1, 1,10), length(filler1)=length(filler2)
 from t2 ot where a in (select a from t1 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	22	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	5	func	1	
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	52	
 select 
 a, mid(filler1, 1,10), length(filler1)=length(filler2) 
@@ -348,7 +348,7 @@ WHERE t1.Code IN (
 SELECT t2.CountryCode FROM t2 WHERE Population > 5000000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	31	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	CountryCode	NULL	NULL	NULL	545	Using where
 SELECT Name FROM t1 
 WHERE t1.Code IN (
@@ -359,6 +359,10 @@ Canada
 China
 Czech Republic
 drop table t1, t2;
+drop procedure if exists p1;
+drop procedure if exists p2;
+drop procedure if exists p3;
+drop procedure if exists p4;
 CREATE TABLE t1(a INT);
 CREATE TABLE t2(c INT);
 CREATE PROCEDURE p1(v1 int)
@@ -692,7 +696,7 @@ The following must use loose index scan over t3, key a:
 explain select count(a) from t2 where a in ( SELECT  a FROM t3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t2	index	a	a	5	NULL	1000	Using index
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	5	func	1	
 2	SUBQUERY	t3	index	a	a	5	NULL	30000	Using index
 select count(a) from t2 where a in ( SELECT  a FROM t3);
 count(a)
diff --git a/mysql-test/r/subselect_sj2_jcl6.result b/mysql-test/r/subselect_sj2_jcl6.result
index 67215d1715e..329cbfc6cd4 100644
--- a/mysql-test/r/subselect_sj2_jcl6.result
+++ b/mysql-test/r/subselect_sj2_jcl6.result
@@ -36,7 +36,7 @@ a	b
 9	5
 explain select * from t2 where b in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	3	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	3	
 1	PRIMARY	t2	ref	b	b	5	test.t1.a	2	Using join buffer
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	
 select * from t2 where b in (select a from t1);
@@ -78,7 +78,7 @@ A.a + 10*B.a, A.a + 10*B.a, A.a + 10*B.a, A.a + 10*B.a
 from t0 A, t0 B where B.a <5;
 explain select * from t3 where b in (select a from t0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	10	
 1	PRIMARY	t3	ref	b	b	5	test.t0.a	1	Using join buffer
 2	SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	
 set @save_ecp= @@engine_condition_pushdown;
@@ -105,7 +105,7 @@ set max_heap_table_size= @save_max_heap_table_size;
 explain select * from t1 where a in (select b from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	5	func	1	
 2	SUBQUERY	t2	index	b	b	5	NULL	10	Using index
 select * from t1;
 a	b
@@ -133,7 +133,7 @@ explain select
 a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z 
 from t1 ot where a in (select a from t2 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	22	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	22	
 1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	32	Using where; Using join buffer
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	22	
 select 
@@ -167,7 +167,7 @@ a, mid(filler1, 1,10), length(filler1)=length(filler2)
 from t2 ot where a in (select a from t1 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	22	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	5	func	1	
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	32	
 select 
 a, mid(filler1, 1,10), length(filler1)=length(filler2) 
@@ -201,7 +201,7 @@ explain select
 a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z 
 from t1 ot where a in (select a from t2 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	22	
+1	PRIMARY	SUBQUERY#2	ALL	unique_key	NULL	NULL	NULL	22	
 1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	52	Using where; Using join buffer
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	22	
 select 
@@ -235,7 +235,7 @@ a, mid(filler1, 1,10), length(filler1)=length(filler2)
 from t2 ot where a in (select a from t1 it);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	ot	ALL	NULL	NULL	NULL	NULL	22	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	5	func	1	
 2	SUBQUERY	it	ALL	NULL	NULL	NULL	NULL	52	
 select 
 a, mid(filler1, 1,10), length(filler1)=length(filler2) 
@@ -352,7 +352,7 @@ WHERE t1.Code IN (
 SELECT t2.CountryCode FROM t2 WHERE Population > 5000000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	PRIMARY	NULL	NULL	NULL	31	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	3	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	3	func	1	
 2	SUBQUERY	t2	ALL	CountryCode	NULL	NULL	NULL	545	Using where
 SELECT Name FROM t1 
 WHERE t1.Code IN (
@@ -363,6 +363,10 @@ Canada
 China
 Czech Republic
 drop table t1, t2;
+drop procedure if exists p1;
+drop procedure if exists p2;
+drop procedure if exists p3;
+drop procedure if exists p4;
 CREATE TABLE t1(a INT);
 CREATE TABLE t2(c INT);
 CREATE PROCEDURE p1(v1 int)
@@ -698,7 +702,7 @@ The following must use loose index scan over t3, key a:
 explain select count(a) from t2 where a in ( SELECT  a FROM t3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t2	index	a	a	5	NULL	1000	Using index
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	5	func	1	
 2	SUBQUERY	t3	index	a	a	5	NULL	30000	Using index
 select count(a) from t2 where a in ( SELECT  a FROM t3);
 count(a)
diff --git a/mysql-test/r/subselect_sj_jcl6.result b/mysql-test/r/subselect_sj_jcl6.result
index 47c3131f944..95dc53e57c0 100644
--- a/mysql-test/r/subselect_sj_jcl6.result
+++ b/mysql-test/r/subselect_sj_jcl6.result
@@ -852,7 +852,7 @@ INSERT INTO t2 VALUES (1,'i','iiii','iiii','iiii','iiii','ffff','ffff','ffff','f
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (a, b) IN (SELECT a, b FROM t2 WHERE pk > 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	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	13	func	1	1.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	13	func	1	1.00	
 2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using MRR
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`pk` > 0))
@@ -1021,7 +1021,7 @@ FROM t1
 WHERE `varchar_nokey`  < 'n' XOR `pk`  )   ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	18	100.00	
-1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	8	func	1	1.00	
+1	PRIMARY	SUBQUERY#2	eq_ref	unique_key	unique_key	8	func	1	1.00	
 2	SUBQUERY	t1	ALL	varchar_key	NULL	NULL	NULL	15	100.00	Using where
 Warnings:
 Note	1003	select `test`.`t2`.`varchar_nokey` AS `varchar_nokey` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`varchar_nokey` = `test`.`t1`.`varchar_key`) and ((`test`.`t1`.`varchar_nokey` < 'n') xor `test`.`t1`.`pk`))
diff --git a/mysql-test/r/view.result b/mysql-test/r/view.result
index 4386f6ed474..29707b57e63 100644
--- a/mysql-test/r/view.result
+++ b/mysql-test/r/view.result
@@ -303,7 +303,7 @@ a+1
 explain select * from v1;
 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	ALL	NULL	NULL	NULL	NULL	4	Using filesort
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	Using filesort
 drop view v1;
 drop table t1;
 create table t1 (a int);
diff --git a/mysql-test/suite/parts/r/partition_alter3_innodb.result b/mysql-test/suite/parts/r/partition_alter3_innodb.result
index cb104d4be54..7825a2350b0 100644
--- a/mysql-test/suite/parts/r/partition_alter3_innodb.result
+++ b/mysql-test/suite/parts/r/partition_alter3_innodb.result
@@ -141,7 +141,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -165,7 +165,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -190,7 +190,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -226,7 +226,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -248,7 +248,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -269,7 +269,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -289,7 +289,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -308,7 +308,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -326,7 +326,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -452,7 +452,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -476,7 +476,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -504,7 +504,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -538,7 +538,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -563,7 +563,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -587,7 +587,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	23	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -610,7 +610,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -632,7 +632,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -653,7 +653,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
diff --git a/mysql-test/suite/parts/r/partition_alter3_myisam.result b/mysql-test/suite/parts/r/partition_alter3_myisam.result
index 374b108b57e..a5dec48e85c 100644
--- a/mysql-test/suite/parts/r/partition_alter3_myisam.result
+++ b/mysql-test/suite/parts/r/partition_alter3_myisam.result
@@ -155,7 +155,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -187,7 +187,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -228,7 +228,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -278,7 +278,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -312,7 +312,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -343,7 +343,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -371,7 +371,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -396,7 +396,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part1	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -418,7 +418,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) FROM t1 WHERE f_date = '1000-02-10';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -552,7 +552,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -584,7 +584,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -628,7 +628,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p6	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -676,7 +676,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -713,7 +713,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	3	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -747,7 +747,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -778,7 +778,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	5	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -806,7 +806,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	part7	ALL	NULL	NULL	NULL	NULL	7	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
@@ -831,7 +831,7 @@ t1.frm
 t1.par
 EXPLAIN PARTITIONS SELECT COUNT(*) <> 1 FROM t1 WHERE f_int1 = 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	20	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	10	Using where
 # check read single success: 1
 # check read all success: 1
 # check read row by row success: 1
diff --git a/mysql-test/suite/pbxt/r/group_min_max.result b/mysql-test/suite/pbxt/r/group_min_max.result
index 2d335c29494..13a28e21e32 100644
--- a/mysql-test/suite/pbxt/r/group_min_max.result
+++ b/mysql-test/suite/pbxt/r/group_min_max.result
@@ -2256,7 +2256,8 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE 
 a IN (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1_outer	index	NULL	a	10	NULL	15	Using where; Using index
+1	PRIMARY	SUBQUERY#2	ALL	distinct_key	NULL	NULL	NULL	15	
+1	PRIMARY	t1_outer	ref	a	a	5	SUBQUERY#2.max(b)	1	Using index
 2	SUBQUERY	t1	index	NULL	a	10	NULL	15	Using index
 EXPLAIN SELECT 1 FROM t1 AS t1_outer GROUP BY a HAVING 
 a > (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);
diff --git a/mysql-test/suite/pbxt/r/metadata.result b/mysql-test/suite/pbxt/r/metadata.result
index c46c6e26ce4..b2a8acd8e9b 100644
--- a/mysql-test/suite/pbxt/r/metadata.result
+++ b/mysql-test/suite/pbxt/r/metadata.result
@@ -55,7 +55,7 @@ id	data	data
 2	female	no
 select t1.id from t1 union select t2.id from t2;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def				id	id	1	4	1	Y	32768	0	63
+def				id	id	1	4	1	Y	49152	0	63
 id
 1
 2
@@ -66,7 +66,7 @@ insert into t1 values (2,'two');
 set @arg00=1 ;
 select @arg00 FROM t1 where a=1 union distinct select 1 FROM t1 where a=1;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def				@arg00	@arg00	8	20	1	Y	32768	0	63
+def				@arg00	@arg00	8	20	1	Y	49152	0	63
 @arg00
 1
 select * from (select @arg00) aaa;
@@ -76,7 +76,7 @@ def			aaa	@arg00	@arg00	8	20	1	Y	32768	0	63
 1
 select 1 union select 1;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def				1	1	8	20	1	N	32769	0	63
+def				1	1	8	20	1	N	49153	0	63
 1
 1
 select * from (select 1 union select 1) aaa;
diff --git a/mysql-test/suite/pbxt/r/partition_hash.result b/mysql-test/suite/pbxt/r/partition_hash.result
index c32c27bf9c6..9a82a36d902 100644
--- a/mysql-test/suite/pbxt/r/partition_hash.result
+++ b/mysql-test/suite/pbxt/r/partition_hash.result
@@ -57,25 +57,25 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
 explain partitions select * from t1 where a is null or (a >= 5 and a <= 7);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p0,p2,p3	ALL	NULL	NULL	NULL	NULL	7	Using where
 explain partitions select * from t1 where a is null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t1 where a is not null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
 explain partitions select * from t1 where a >= 1 and a < 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	5	Using where
 explain partitions select * from t1 where a >= 3 and a <= 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a > 2 and a < 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a > 3 and a <= 6;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
+1	SIMPLE	t1	p2,p3	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a > 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1,p2,p3	ALL	NULL	NULL	NULL	NULL	9	Using where
diff --git a/mysql-test/suite/pbxt/r/partition_pruning.result b/mysql-test/suite/pbxt/r/partition_pruning.result
index f6a4d19a670..0c05695755b 100644
--- a/mysql-test/suite/pbxt/r/partition_pruning.result
+++ b/mysql-test/suite/pbxt/r/partition_pruning.result
@@ -14,7 +14,7 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a=2;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a=1 or a=2;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	3	Using where
@@ -31,7 +31,7 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0,p1	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t2 where a=1 and b=1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 create table t3 (
 a int
 )
@@ -42,16 +42,16 @@ partition p1 values less than (20)
 insert into t3 values (5),(15);
 explain partitions select * from t3 where a=11;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t3	p1	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t3	p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t3 where a=10;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t3	p1	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t3	p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t3 where a=20;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t3		ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t3		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t3 where a=30;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t3		ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t3		ALL	NULL	NULL	NULL	NULL	0	Using where
 create table t4 (a int not null, b int not null) partition by LIST (a+b) (
 partition p0 values in (12),
 partition p1 values in (14)
@@ -59,11 +59,11 @@ partition p1 values in (14)
 insert into t4 values (10,2), (10,4);
 explain partitions select * from t4 where (a=10 and b=1) or (a=10 and b=2);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	p0	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t4	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t4 
 where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	p0	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t4	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t4 where (a=10 and b=2) or (a=10 and b=3)
 or (a=10 and b = 4);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
@@ -89,25 +89,25 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 explain partitions select * from t5
 where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t5	p0_p0sp0,p0_p0sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t5	p0_p0sp0,p0_p0sp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t5 where (a=10 and b=2) or (a=10 and b=3)
 or (a=10 and b = 4);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t5	p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t5 where (c=1 and d=1);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t5	p0_p0sp0,p1_p1sp0	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t5	p0_p0sp0,p1_p1sp0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t5 where (c=2 and d=1);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t5	p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t5	p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or 
 (c=2 and d=1);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t5	p0_p0sp0,p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t5	p0_p0sp0,p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or 
 (b=2 and c=2 and d=1);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t5	p0_p0sp0,p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t5	p0_p0sp0,p0_p0sp1,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	3	Using where
 create table t6 (a int not null) partition by LIST(a) (
 partition p1 values in (1),
 partition p3 values in (3),
@@ -121,34 +121,34 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t6		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t6 where a <= 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p1	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t6	p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a >  9;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6		ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t6		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t6 where a >= 9;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p9	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t6	p9	ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t6 where a > 0 and a < 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t6	p1,p3	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a > 5 and a < 12;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p7,p9	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t6	p7,p9	ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t6 where a > 3 and a < 8 ;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p5,p7	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t6	p5,p7	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a >= 0 and a <= 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t6	p1,p3,p5	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t6 where a >= 5 and a <= 12;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p5,p7,p9	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t6	p5,p7,p9	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a >= 3 and a <= 8;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p3,p5,p7	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t6	p3,p5,p7	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a > 3 and a < 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6		ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t6		ALL	NULL	NULL	NULL	NULL	0	Using where
 drop table t6;
 create table t6 (a int unsigned not null) partition by LIST(a) (
 partition p1 values in (1),
@@ -163,34 +163,34 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t6		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t6 where a <= 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p1	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t6	p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a >  9;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6		ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t6		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t6 where a >= 9;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p9	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t6	p9	ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t6 where a > 0 and a < 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t6	p1,p3	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a > 5 and a < 12;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p7,p9	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t6	p7,p9	ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t6 where a > 3 and a < 8 ;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p5,p7	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t6	p5,p7	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a >= 0 and a <= 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t6	p1,p3,p5	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t6 where a >= 5 and a <= 12;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p5,p7,p9	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t6	p5,p7,p9	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a >= 3 and a <= 8;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6	p3,p5,p7	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t6	p3,p5,p7	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t6 where a > 3 and a < 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t6		ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t6		ALL	NULL	NULL	NULL	NULL	0	Using where
 create table t7 (a int not null) partition by RANGE(a) (
 partition p10 values less than (10),
 partition p30 values less than (30),
@@ -207,25 +207,25 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t7	p10	ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t7 where a <= 10;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7	p10,p30	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t7	p10,p30	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t7 where a = 10;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7	p30	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t7	p30	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t7 where a < 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t7	p10,p30,p50,p70,p90	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t7 where a = 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t7 where a > 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t7 where a >= 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t7 where a > 11 and a < 29;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7	p30	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7	p30	ALL	NULL	NULL	NULL	NULL	2	Using where
 drop table t7;
 create table t7 (a int unsigned not null) partition by RANGE(a) (
 partition p10 values less than (10),
@@ -243,25 +243,25 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t7	p10	ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t7 where a <= 10;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7	p10,p30	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t7	p10,p30	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t7 where a = 10;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7	p30	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t7	p30	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t7 where a < 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t7	p10,p30,p50,p70,p90	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t7 where a = 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t7 where a > 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t7 where a >= 90;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t7 where a > 11 and a < 29;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t7	p30	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7	p30	ALL	NULL	NULL	NULL	NULL	2	Using where
 create table t8 (a date not null) partition by RANGE(YEAR(a)) (
 partition p0 values less than (1980),
 partition p1 values less than (1990),
@@ -270,7 +270,7 @@ partition p2 values less than (2000)
 insert into t8 values ('1985-05-05'),('1995-05-05');
 explain partitions select * from t8 where a < '1980-02-02';
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t8	p0,p1	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t8	p0,p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 create table t9 (a date not null) partition by RANGE(TO_DAYS(a)) (
 partition p0 values less than (732299), -- 2004-12-19
 partition p1 values less than (732468), -- 2005-06-06
@@ -295,13 +295,13 @@ partition p2 values less than (9)
 insert into t1 values (1),(2),(3);
 explain partitions select * from t1 where a1 > 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a1 >= 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a1 < 3 and a1 > 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 drop table t1;
 create table t3 (a int, b int) 
 partition by list(a) subpartition by hash(b) subpartitions 4 (
@@ -325,7 +325,7 @@ create table t1 (a int) partition by hash(a) partitions 2;
 insert into t1 values (1),(2);
 explain partitions select * from t1 where a is null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a is not null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	2	Using where
@@ -342,20 +342,20 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 explain partitions
 select * from t1 X, t1 Y where X.a = Y.a and (X.a=1 or X.a=2);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	X	p1,p2	ALL	a	NULL	NULL	NULL	4	Using where
+1	SIMPLE	X	p1,p2	ALL	a	NULL	NULL	NULL	2	Using where
 1	SIMPLE	Y	p1,p2	ref	a	a	4	test.X.a	1	
 drop table t1;
 create table t1 (a int) partition by hash(a) partitions 20;
 insert into t1 values (1),(2),(3);
 explain partitions select * from t1 where a >  1 and a < 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a >= 1 and a < 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p1,p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a >  1 and a <= 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2,p3	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	p2,p3	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a >= 1 and a <= 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p1,p2,p3	ALL	NULL	NULL	NULL	NULL	3	Using where
@@ -371,10 +371,10 @@ partition p3 values in (3)
 insert into t1 values (1,1),(2,2),(3,3);
 explain partitions select * from t1 where b >  1 and b < 3;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0_p0sp2,p1_p1sp2,p2_p2sp2,p3_p3sp2	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	p0_p0sp2,p1_p1sp2,p2_p2sp2,p3_p3sp2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where b >  1 and b < 3 and (a =1 or a =2);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p1_p1sp2,p2_p2sp2	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	p1_p1sp2,p2_p2sp2	ALL	NULL	NULL	NULL	NULL	2	Using where
 drop table t1;
 create table t1 (a int) partition by list(a) (
 partition p0 values in (1,2),
@@ -445,22 +445,22 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0,p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	1010	
 explain partitions select * from t2 where a < 801 and a > 200;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	800	Using where
 explain partitions select * from t2 where a < 801 and a > 800;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p4	ALL	NULL	NULL	NULL	NULL	200	Using where
 explain partitions select * from t2 where a > 600;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	400	Using where
 explain partitions select * from t2 where a > 600 and b = 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	400	Using where
 explain partitions select * from t2 where a > 600 and b = 4;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	400	Using where
 explain partitions select * from t2 where a > 600 and b = 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
+1	SIMPLE	t2	p3,p4	ALL	NULL	NULL	NULL	NULL	400	Using where
 explain partitions select * from t2 where b = 5;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0,p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	1010	Using where
@@ -515,19 +515,19 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0,p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	910	
 explain partitions select * from t2 where a = 101;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	910	Using where
+1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	110	Using where
 explain partitions select * from t2 where a = 550;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	910	Using where
+1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	200	Using where
 explain partitions select * from t2 where a = 833;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p4	ALL	NULL	NULL	NULL	NULL	910	Using where
+1	SIMPLE	t2	p4	ALL	NULL	NULL	NULL	NULL	200	Using where
 explain partitions select * from t2 where (a = 100 OR a = 900);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0,p4	ALL	NULL	NULL	NULL	NULL	910	Using where
+1	SIMPLE	t2	p0,p4	ALL	NULL	NULL	NULL	NULL	310	Using where
 explain partitions select * from t2 where (a > 100 AND a < 600);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0,p1,p2	ALL	NULL	NULL	NULL	NULL	910	Using where
+1	SIMPLE	t2	p0,p1,p2	ALL	NULL	NULL	NULL	NULL	510	Using where
 analyze table t2;
 Table	Op	Msg_type	Msg_text
 test.t2	analyze	status	OK
@@ -692,7 +692,7 @@ f_int1
 NULL
 explain partitions select * from t1 where f_int1 is null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	part4_part4sp0	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	part4_part4sp0	ALL	NULL	NULL	NULL	NULL	2	Using where
 drop table t1;
 create table t1 (a int not null, b int not null)
 partition by list(a) 
@@ -721,10 +721,10 @@ insert into t1 values (1,1),(1,2),(1,3),(1,4),
 (2,1),(2,2),(2,3),(2,4), (NULL,1);
 explain partitions select * from t1 where a IS NULL AND (b=1 OR b=2);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pn_pnsp0,pn_pnsp1	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	pn_pnsp0,pn_pnsp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where (a IS NULL or a < 1) AND (b=1 OR b=2);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pn_pnsp0,pn_pnsp1	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	pn_pnsp0,pn_pnsp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where (a IS NULL or a < 2) AND (b=1 OR b=2);
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p0_p0sp0,p0_p0sp1,pn_pnsp0,pn_pnsp1	ALL	NULL	NULL	NULL	NULL	5	Using where
@@ -753,7 +753,7 @@ count(*)
 1
 explain partitions select count(*) from t1 where s1 < 0 or s1 is null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p3	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	p3	ALL	NULL	NULL	NULL	NULL	2	Using where
 drop table t1;
 create table t1 (a char(32) primary key)
 partition by key()
@@ -812,24 +812,24 @@ insert into t1 values (18446744073709551000+1);
 insert into t1 values (18446744073709551614-1);
 explain partitions select * from t1 where a < 10;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	1	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 
 where a >= 18446744073709551000-1 and a <= 18446744073709551000+1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p3,p4	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p3,p4	ALL	NULL	NULL	NULL	NULL	3	Using where
 explain partitions select * from t1 
 where a between 18446744073709551001 and 18446744073709551002;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a = 18446744073709551000;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a = 18446744073709551613;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a = 18446744073709551614;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 drop table t1;
 create table t1 (a int)
 partition by range(a) (
@@ -853,34 +853,34 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a=0xFE;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t2 where a=0xFE;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a > 0xFE AND a <= 0xFF;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t2 where a > 0xFE AND a <= 0xFF;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2		ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t2		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t1 where a >= 0xFE AND a <= 0xFF;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t2 where a >= 0xFE AND a <= 0xFF;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t2	p2	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a < 64 AND a >= 63;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t2 where a < 64 AND a >= 63;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t2	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a <= 64 AND a >= 63;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t2 where a <= 64 AND a >= 63;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	p0,p1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t2	p0,p1	ALL	NULL	NULL	NULL	NULL	4	Using where
 drop table t1;
 drop table t2;
 create table t1(a bigint unsigned not null) partition by range(a+0) (
@@ -898,7 +898,7 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 explain partitions select * from t1 where 
 a > 0xFFFFFFFFFFFFFFEC and a < 0xFFFFFFFFFFFFFFEE;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 explain partitions select * from t1 where a>=0 and a <= 0xFFFFFFFFFFFFFFFF;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	8	Using where
diff --git a/mysql-test/suite/pbxt/r/partition_range.result b/mysql-test/suite/pbxt/r/partition_range.result
index 4f41c667a5d..a8c4e36cbc2 100644
--- a/mysql-test/suite/pbxt/r/partition_range.result
+++ b/mysql-test/suite/pbxt/r/partition_range.result
@@ -21,19 +21,19 @@ select * from t1 where a > 1;
 a
 explain partitions select * from t1 where a is null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	pnull	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a >= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	p0,p1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a < 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	pnull	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a <= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull,p0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	pnull,p0	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a > 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 drop table t1;
 create table t1 (a int unsigned, b int unsigned)
 partition by range (a)
@@ -63,19 +63,19 @@ select * from t1 where a > 1;
 a	b
 explain partitions select * from t1 where a is null;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a >= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	p0_p0sp0,p0_p0sp1,p1_p1sp0,p1_p1sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a < 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1	ALL	NULL	NULL	NULL	NULL	2	Using where
 explain partitions select * from t1 where a <= 0;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1,p0_p0sp0,p0_p0sp1	ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1	pnull_pnullsp0,pnull_pnullsp1,p0_p0sp0,p0_p0sp1	ALL	NULL	NULL	NULL	NULL	4	Using where
 explain partitions select * from t1 where a > 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	6	Using where
+1	SIMPLE	t1		ALL	NULL	NULL	NULL	NULL	0	Using where
 drop table t1;
 CREATE TABLE t1 (
 a int not null,
diff --git a/mysql-test/suite/pbxt/r/subselect.result b/mysql-test/suite/pbxt/r/subselect.result
index 8849d0b0204..b87fffb5053 100644
--- a/mysql-test/suite/pbxt/r/subselect.result
+++ b/mysql-test/suite/pbxt/r/subselect.result
@@ -3420,18 +3420,20 @@ 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	t1	ALL	NULL	NULL	NULL	NULL	9	
+1	PRIMARY	SUBQUERY#2	eq_ref	distinct_key	distinct_key	23	test.t1.a,test.t1.b	1	
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 ALTER TABLE t1 ADD INDEX(a);
 SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a);
 a	b
+AAA	8
 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	SUBQUERY#2	ALL	distinct_key	NULL	NULL	NULL	9	
+1	PRIMARY	t1	ref	a	a	8	SUBQUERY#2.a	1	Using where
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 DROP TABLE t1;
 create table t1( f1 int,f2 int);
diff --git a/mysql-test/t/subselect_mat.test b/mysql-test/t/subselect_mat.test
index dff9a7cf223..aae1772a1ea 100644
--- a/mysql-test/t/subselect_mat.test
+++ b/mysql-test/t/subselect_mat.test
@@ -75,6 +75,7 @@ explain extended
 select * from t1i where a1 in (select b1 from t2i where b1 > '0');
 select * from t1i where a1 in (select b1 from t2i where b1 > '0');
 
+--replace_column 6 # 8 # 11 #
 explain extended
 select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
 select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
@@ -83,10 +84,12 @@ explain extended
 select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
 select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
 
+--replace_column 6 # 7 # 8 # 11 #
 explain extended
 select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
 select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
 
+--replace_column 6 # 7 # 8 # 11 #
 explain extended
 select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
 select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
@@ -174,6 +177,7 @@ where (a1, a2) in (select b1, b2 from t2 where b1 >  '0') and
       (a1, a2) in (select c1, c2 from t3
                    where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
 
+--replace_column 6 # 7 # 8 # 11 #
 explain extended
 select * from t1i
 where (a1, a2) in (select b1, b2 from t2i where b1 >  '0') and
@@ -215,6 +219,7 @@ where (a1, a2) in (select b1, b2 from t2
 
 
 # multiple levels of nesting subqueries, unions
+--replace_column 6 # 7 # 8 # 11 #
 explain extended
 (select * from t1
 where (a1, a2) in (select b1, b2 from t2
@@ -829,8 +834,12 @@ select min(a1) from t1 where 7 in (select b1 from t2);
 # This is the only correct result of all four queries. This difference is
 # filed as BUG#40037.
 set @@optimizer_switch='default,materialization=off';
+-- echo # with MariaDB and MWL#90, this particular case is solved:
 explain select min(a1) from t1 where 7 in (select b1 from t2);
 select min(a1) from t1 where 7 in (select b1 from t2);
+-- echo # but when we go around MWL#90 code, the problem still shows up:
+explain select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
+select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
 drop table t1,t2;
 
 #
diff --git a/mysql-test/t/subselect_sj2.test b/mysql-test/t/subselect_sj2.test
index e73e7cfade2..ddc7208076b 100644
--- a/mysql-test/t/subselect_sj2.test
+++ b/mysql-test/t/subselect_sj2.test
@@ -490,6 +490,12 @@ drop table t1, t2;
 # Bug#33062: subquery in stored routine cause crash
 #
 
+--disable_warnings
+drop procedure if exists p1;
+drop procedure if exists p2;
+drop procedure if exists p3;
+drop procedure if exists p4;
+--enable_warnings
 CREATE TABLE t1(a INT);
 CREATE TABLE t2(c INT);