Merge of mwl #106 into 5.3.

51 files changed, 1126 insertions, 246 deletions

diff --git a/mysql-test/r/derived.result b/mysql-test/r/derived.result
index 043231fd268..fe803ed37a5 100644
--- a/mysql-test/r/derived.result
+++ b/mysql-test/r/derived.result
@@ -57,9 +57,8 @@ a	b	a	b
 3	c	3	c
 explain select * from t1 as x1, (select * from t1) as x2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	x1	ALL	NULL	NULL	NULL	NULL	4	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	Using join buffer (flat, BNL join)
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	
+1	SIMPLE	x1	ALL	NULL	NULL	NULL	NULL	4	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using join buffer (flat, BNL join)
 drop table if exists  t2,t3;
 select * from (select 1) as a;
 1
@@ -91,7 +90,7 @@ a	b
 2	b
 explain select * from (select * from t1 union select * from t1) a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	8	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	
 3	UNION	t1	ALL	NULL	NULL	NULL	NULL	4	
 NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -113,9 +112,8 @@ a	b
 3	c
 explain select * from (select t1.*, t2.a as t2a from t1,t2 where t1.a=t2.a) t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t2	system	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
+1	SIMPLE	t2	system	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
 drop table t1, t2;
 create table t1(a int not null, t char(8), index(a));
 SELECT * FROM (SELECT * FROM t1) as b ORDER BY a  ASC LIMIT 0,20;
@@ -142,8 +140,7 @@ a	t
 20	20
 explain select count(*) from t1 as tt1, (select * from t1) as tt2;
 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	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	10000	
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
 drop table t1;
 SELECT * FROM (SELECT (SELECT * FROM (SELECT 1 as a) as a )) as b;
 (SELECT * FROM (SELECT 1 as a) as a )
@@ -172,30 +169,30 @@ insert into t1 values (NULL, 'a', 1), (NULL, 'b', 2), (NULL, 'c', 3), (NULL, 'd'
 insert into t2 values (1, 100), (1, 101), (1, 102), (2, 100), (2, 103), (2, 104), (3, 101), (3, 102), (3, 105);
 SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 pla_id	mat_id
-100	1
-101	1
 102	1
-103	2
+101	1
+100	1
 104	2
+103	2
 105	3
 SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2  INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 pla_id	test
-100	1
-101	1
 102	1
-103	2
+101	1
+100	1
 104	2
+103	2
 105	3
 explain SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
+1	PRIMARY	<derived2>	ref	key0	key0	7	test.m2.matintnum	2	
 2	DERIVED	mp	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 2	DERIVED	m1	eq_ref	PRIMARY	PRIMARY	3	test.mp.mat_id	1	
 explain SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2  INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
+1	PRIMARY	<derived2>	ref	key0	key0	7	test.m2.matintnum	2	
 2	DERIVED	mp	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 2	DERIVED	m1	eq_ref	PRIMARY	PRIMARY	3	test.mp.mat_id	1	
 drop table t1,t2;
@@ -230,9 +227,8 @@ count(*)
 2
 explain select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	THEMAX.E2	1	Using where
-2	DERIVED	A	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	A	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.A.E2	1	Using where
 3	DEPENDENT SUBQUERY	B	ALL	NULL	NULL	NULL	NULL	2	Using where
 drop table t1;
 create table t1 (a int);
@@ -245,8 +241,8 @@ a	a
 2	2
 explain select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	
+1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	4	Using join buffer (flat, BNL join)
 4	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	
 5	UNION	t1	ALL	NULL	NULL	NULL	NULL	2	
 NULL	UNION RESULT	<union4,5>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -311,7 +307,7 @@ a	7.0000
 b	3.5000
 explain SELECT s.name, AVG(s.val) AS median FROM (SELECT x.name, x.val FROM t1 x, t1 y WHERE x.name=y.name GROUP BY x.name, x.val HAVING SUM(y.val <= x.val) >= COUNT(*)/2 AND SUM(y.val >= x.val) >= COUNT(*)/2) AS s GROUP BY s.name;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	Using temporary; Using filesort
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	289	Using temporary; Using filesort
 2	DERIVED	x	ALL	NULL	NULL	NULL	NULL	17	Using temporary; Using filesort
 2	DERIVED	y	ALL	NULL	NULL	NULL	NULL	17	Using where; Using join buffer (flat, BNL join)
 drop table t1;
@@ -322,8 +318,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	index	PRIMARY	PRIMARY	4	NULL	2	Using where; Using index
 explain select a from (select a from t2 where a>1) tt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t2	index	PRIMARY	PRIMARY	4	NULL	2	Using where; Using index
+1	SIMPLE	t2	index	PRIMARY	PRIMARY	4	NULL	2	Using where; Using index
 drop table t2;
 CREATE TABLE `t1` ( `itemid` int(11) NOT NULL default '0', `grpid` varchar(15) NOT NULL default '', `vendor` int(11) NOT NULL default '0', `date_` date NOT NULL default '0000-00-00', `price` decimal(12,2) NOT NULL default '0.00', PRIMARY KEY  (`itemid`,`grpid`,`vendor`,`date_`), KEY `itemid` (`itemid`,`vendor`), KEY `itemid_2` (`itemid`,`date_`));
 insert into t1 values (128, 'rozn', 2, curdate(), 10),
@@ -412,3 +407,21 @@ MIN(i)
 1
 DROP TABLE t1;
 # End of 5.0 tests
+#
+#  LP bug #793436: query with a derived table for which optimizer proves
+#                  that it contains not more than 1 row
+#
+CREATE TABLE t1 (a int, KEY (a)) ;
+INSERT INTO t1 VALUES (3), (1);
+CREATE TABLE t2 (a int);
+INSERT INTO t2 VALUES (3);
+EXPLAIN
+SELECT * FROM (SELECT DISTINCT * FROM t2) t, t1  WHERE t1.a = t.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
+1	PRIMARY	t1	ref	a	a	5	const	1	Using index
+2	DERIVED	t2	system	NULL	NULL	NULL	NULL	1	
+SELECT * FROM (SELECT DISTINCT * FROM t2) t, t1  WHERE t1.a = t.a;
+a	a
+3	3
+DROP TABLE t1,t2;
diff --git a/mysql-test/r/derived_view.result b/mysql-test/r/derived_view.result
new file mode 100644
index 00000000000..5e3fc1e8cf1
--- /dev/null
+++ b/mysql-test/r/derived_view.result
@@ -0,0 +1,591 @@
+drop table if exists t1,t2;
+drop view if exists v1,v2,v3,v4;
+create table t1(f1 int, f11 int);
+create table t2(f2 int, f22 int);
+insert into t1 values(1,1),(2,2),(3,3),(5,5),(9,9),(7,7);
+insert into t1 values(17,17),(13,13),(11,11),(15,15),(19,19);
+insert into t2 values(1,1),(3,3),(2,2),(4,4),(8,8),(6,6);
+insert into t2 values(12,12),(14,14),(10,10),(18,18),(16,16);
+Tests:
+for merged derived tables
+explain for simple derived
+explain select * from (select * from t1) tt;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	
+select * from (select * from t1) tt;
+f1	f11
+1	1
+2	2
+3	3
+5	5
+9	9
+7	7
+17	17
+13	13
+11	11
+15	15
+19	19
+explain for multitable derived
+explain extended select * from (select * from t1 join t2 on f1=f2) tt;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t1` join `test`.`t2` where (`test`.`t2`.`f2` = `test`.`t1`.`f1`)
+select * from (select * from t1 join t2 on f1=f2) tt;
+f1	f11	f2	f22
+1	1	1	1
+3	3	3	3
+2	2	2	2
+explain for derived with where
+explain extended 
+select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where ((`test`.`t1`.`f11` = 2) and (`test`.`t1`.`f1` in (2,3)))
+select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
+f1	f11
+2	2
+join of derived
+explain extended 
+select * from (select * from t1 where f1 in (2,3)) tt join
+(select * from t1 where f1 in (1,2)) aa on tt.f1=aa.f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` join `test`.`t1` where ((`test`.`t1`.`f1` = `test`.`t1`.`f1`) and (`test`.`t1`.`f1` in (1,2)) and (`test`.`t1`.`f1` in (2,3)))
+select * from (select * from t1 where f1 in (2,3)) tt join
+(select * from t1 where f1 in (1,2)) aa on tt.f1=aa.f1;
+f1	f11	f1	f11
+2	2	2	2
+flush status;
+explain extended 
+select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where ((`test`.`t1`.`f11` = 2) and (`test`.`t1`.`f1` in (2,3)))
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	0
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	0
+flush status;
+select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
+f1	f11
+2	2
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	0
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	12
+for merged views
+create view v1 as select * from t1;
+create view v2 as select * from t1 join t2 on f1=f2;
+create view v3 as select * from t1 where f1 in (2,3);
+create view v4 as select * from t2 where f2 in (2,3);
+explain for simple views
+explain extended select * from v1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1`
+select * from v1;
+f1	f11
+1	1
+2	2
+3	3
+5	5
+9	9
+7	7
+17	17
+13	13
+11	11
+15	15
+19	19
+explain for multitable views
+explain extended select * from v2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t1` join `test`.`t2` where (`test`.`t2`.`f2` = `test`.`t1`.`f1`)
+select * from v2;
+f1	f11	f2	f22
+1	1	1	1
+3	3	3	3
+2	2	2	2
+explain for views with where
+explain extended select * from v3 where f11 in (1,3);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where ((`test`.`t1`.`f11` in (1,3)) and (`test`.`t1`.`f1` in (2,3)))
+select * from v3 where f11 in (1,3);
+f1	f11
+3	3
+explain for joined views
+explain extended
+select * from v3 join v4 on f1=f2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`f2` = `test`.`t1`.`f1`) and (`test`.`t1`.`f1` in (2,3)) and (`test`.`t1`.`f1` in (2,3)))
+select * from v3 join v4 on f1=f2;
+f1	f11	f2	f22
+3	3	3	3
+2	2	2	2
+flush status;
+explain extended select * from v4 where f2 in (1,3);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+Warnings:
+Note	1003	select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t2` where ((`test`.`t2`.`f2` in (1,3)) and (`test`.`t2`.`f2` in (2,3)))
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	0
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	0
+flush status;
+select * from v4 where f2 in (1,3);
+f2	f22
+3	3
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	0
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	12
+for materialized derived tables
+explain for simple derived
+explain extended select * from (select * from t1 group by f1) tt;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	11	100.00	
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
+Warnings:
+Note	1003	select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` group by `test`.`t1`.`f1`) `tt`
+select * from (select * from t1 having f1=f1) tt;
+f1	f11
+1	1
+2	2
+3	3
+5	5
+9	9
+7	7
+17	17
+13	13
+11	11
+15	15
+19	19
+explain showing created indexes
+explain extended 
+select * from t1 join (select * from t2 group by f2) tt on f1=f2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.f1	2	100.00	
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`tt`.`f2` AS `f2`,`tt`.`f22` AS `f22` from `test`.`t1` join (select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t2` group by `test`.`t2`.`f2`) `tt` where (`tt`.`f2` = `test`.`t1`.`f1`)
+select * from t1 join (select * from t2 group by f2) tt on f1=f2;
+f1	f11	f2	f22
+1	1	1	1
+2	2	2	2
+3	3	3	3
+explain showing late materialization
+flush status;
+explain select * from t1 join (select * from t2 group by f2) tt on f1=f2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	11	Using where
+1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.f1	2	
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	11	Using temporary; Using filesort
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	0
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	0
+flush status;
+select * from t1 join (select * from t2 group by f2) tt on f1=f2;
+f1	f11	f2	f22
+1	1	1	1
+2	2	2	2
+3	3	3	3
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	11
+Handler_read_next	3
+Handler_read_prev	0
+Handler_read_rnd	11
+Handler_read_rnd_next	36
+for materialized views
+drop view v1,v2,v3;
+create view v1 as select * from t1 group by f1;
+create view v2 as select * from t2 group by f2;
+create view v3 as select t1.f1,t1.f11 from t1 join t1 as t11 where t1.f1=t11.f1
+having t1.f1<100;
+explain for simple derived
+explain extended select * from v1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	11	100.00	
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
+Warnings:
+Note	1003	select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1`
+select * from v1;
+f1	f11
+1	1
+2	2
+3	3
+5	5
+7	7
+9	9
+11	11
+13	13
+15	15
+17	17
+19	19
+explain showing created indexes
+explain extended select * from t1 join v2 on f1=f2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.f1	2	100.00	
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`v2`.`f2` AS `f2`,`v2`.`f22` AS `f22` from `test`.`t1` join `test`.`v2` where (`v2`.`f2` = `test`.`t1`.`f1`)
+select * from t1 join v2 on f1=f2;
+f1	f11	f2	f22
+1	1	1	1
+2	2	2	2
+3	3	3	3
+explain extended
+select * from t1,v3 as v31,v3 where t1.f1=v31.f1 and t1.f1=v3.f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.f1	10	100.00	
+1	PRIMARY	<derived3>	ref	key0	key0	5	test.t1.f1	10	100.00	
+3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	
+3	DERIVED	t11	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using join buffer (flat, BNL join)
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	
+2	DERIVED	t11	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`v31`.`f1` AS `f1`,`v31`.`f11` AS `f11`,`v3`.`f1` AS `f1`,`v3`.`f11` AS `f11` from `test`.`t1` join `test`.`v3` `v31` join `test`.`v3` where ((`v31`.`f1` = `test`.`t1`.`f1`) and (`v3`.`f1` = `test`.`t1`.`f1`))
+flush status;
+select * from t1,v3 as v31,v3 where t1.f1=v31.f1 and t1.f1=v3.f1;
+f1	f11	f1	f11	f1	f11
+1	1	1	1	1	1
+2	2	2	2	2	2
+3	3	3	3	3	3
+5	5	5	5	5	5
+9	9	9	9	9	9
+7	7	7	7	7	7
+17	17	17	17	17	17
+13	13	13	13	13	13
+11	11	11	11	11	11
+15	15	15	15	15	15
+19	19	19	19	19	19
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	22
+Handler_read_next	22
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	60
+explain showing late materialization
+flush status;
+explain select * from t1 join v2 on f1=f2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	11	Using where
+1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.f1	2	
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	11	Using temporary; Using filesort
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	0
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	0
+flush status;
+select * from t1 join v2 on f1=f2;
+f1	f11	f2	f22
+1	1	1	1
+2	2	2	2
+3	3	3	3
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	11
+Handler_read_next	3
+Handler_read_prev	0
+Handler_read_rnd	11
+Handler_read_rnd_next	36
+explain extended select * from v1 join v4 on f1=f2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	PRIMARY	<derived2>	ref	key0	key0	5	test.t2.f2	2	100.00	
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
+Warnings:
+Note	1003	select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11`,`test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`v1` join `test`.`t2` where ((`v1`.`f1` = `test`.`t2`.`f2`) and (`test`.`t2`.`f2` in (2,3)))
+select * from v1 join v4 on f1=f2;
+f1	f11	f2	f22
+3	3	3	3
+2	2	2	2
+merged derived in merged derived
+explain extended select * from (select * from 
+(select * from t1 where f1 < 7) tt where f1 > 2) zz;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where ((`test`.`t1`.`f1` > 2) and (`test`.`t1`.`f1` < 7))
+select * from (select * from 
+(select * from t1 where f1 < 7) tt where f1 > 2) zz;
+f1	f11
+3	3
+5	5
+materialized derived in merged derived
+explain extended  select * from (select * from 
+(select * from t1 where f1 < 7 group by f1) tt where f1 > 2) zz;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	<derived3>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+Warnings:
+Note	1003	select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2)
+select * from (select * from 
+(select * from t1 where f1 < 7 group by f1) tt where f1 > 2) zz;
+f1	f11
+3	3
+5	5
+merged derived in materialized derived
+explain  extended select * from (select * from 
+(select * from t1 where f1 < 7) tt where f1 > 2 group by f1) zz;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	11	100.00	
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+Warnings:
+Note	1003	select `zz`.`f1` AS `f1`,`zz`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where ((`test`.`t1`.`f1` > 2) and (`test`.`t1`.`f1` < 7)) group by `test`.`t1`.`f1`) `zz`
+select * from (select * from 
+(select * from t1 where f1 < 7) tt where f1 > 2 group by f1) zz;
+f1	f11
+3	3
+5	5
+materialized derived in materialized derived
+explain extended  select * from (select * from 
+(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	11	100.00	
+2	DERIVED	<derived3>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+Warnings:
+Note	1003	select `zz`.`f1` AS `f1`,`zz`.`f11` AS `f11` from (select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `zz`
+select * from (select * from 
+(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
+f1	f11
+3	3
+5	5
+mat in merged derived join mat in merged derived
+explain extended  select * from 
+(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
+join 
+(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z
+on x.f1 = z.f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	<derived3>	ALL	key0	NULL	NULL	NULL	11	100.00	Using where
+1	SIMPLE	<derived5>	ref	key0	key0	5	tt.f1	2	100.00	
+5	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+Warnings:
+Note	1003	select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11`,`tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` join (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where ((`tt`.`f1` = `tt`.`f1`) and (`tt`.`f1` > 2) and (`tt`.`f1` > 2))
+flush status;
+select * from 
+(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
+join 
+(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z
+on x.f1 = z.f1;
+f1	f11	f1	f11
+3	3	3	3
+5	5	5	5
+show status like 'Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	2
+Handler_read_next	2
+Handler_read_prev	0
+Handler_read_rnd	8
+Handler_read_rnd_next	39
+flush status;
+merged in merged derived join merged in merged derived
+explain extended  select * from 
+(select * from 
+(select * from t1 where f1 < 7 ) tt where f1 > 2 ) x
+join 
+(select * from 
+(select * from t1 where f1 < 7 ) tt where f1 > 2 ) z
+on x.f1 = z.f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` join `test`.`t1` where ((`test`.`t1`.`f1` = `test`.`t1`.`f1`) and (`test`.`t1`.`f1` > 2) and (`test`.`t1`.`f1` < 7) and (`test`.`t1`.`f1` > 2) and (`test`.`t1`.`f1` < 7))
+select * from 
+(select * from 
+(select * from t1 where f1 < 7 ) tt where f1 > 2 ) x
+join 
+(select * from 
+(select * from t1 where f1 < 7 ) tt where f1 > 2 ) z
+on x.f1 = z.f1;
+f1	f11	f1	f11
+3	3	3	3
+5	5	5	5
+materialized in materialized derived join 
+materialized in materialized derived
+explain extended  select * from 
+(select * from 
+(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) x
+join 
+(select * from 
+(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) z
+on x.f1 = z.f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<derived2>	ALL	key0	NULL	NULL	NULL	11	100.00	Using where
+1	PRIMARY	<derived4>	ref	key0	key0	5	x.f1	2	100.00	
+4	DERIVED	<derived5>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+5	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+2	DERIVED	<derived3>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+Warnings:
+Note	1003	select `x`.`f1` AS `f1`,`x`.`f11` AS `f11`,`z`.`f1` AS `f1`,`z`.`f11` AS `f11` from (select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `x` join (select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `z` where (`z`.`f1` = `x`.`f1`)
+select * from 
+(select * from 
+(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) x
+join 
+(select * from 
+(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) z
+on x.f1 = z.f1;
+f1	f11	f1	f11
+3	3	3	3
+5	5	5	5
+merged view in materialized derived
+explain extended
+select * from (select * from v4 group by 1) tt;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	11	100.00	
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where; Using temporary; Using filesort
+Warnings:
+Note	1003	select `tt`.`f2` AS `f2`,`tt`.`f22` AS `f22` from (select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t2` where (`test`.`t2`.`f2` in (2,3)) group by 1) `tt`
+select * from (select * from v4 group by 1) tt;
+f2	f22
+2	2
+3	3
+materialized view in merged derived
+explain extended 
+select * from ( select * from v1 where f1 < 7) tt;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	<derived3>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
+Warnings:
+Note	1003	select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1` where (`v1`.`f1` < 7)
+select * from ( select * from v1 where f1 < 7) tt;
+f1	f11
+1	1
+2	2
+3	3
+5	5
+merged view in a merged view in a merged derived
+create view v6 as select * from v4 where f2 < 7;
+explain extended select * from (select * from v6) tt;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+Warnings:
+Note	1003	select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t2` where ((`test`.`t2`.`f2` < 7) and (`test`.`t2`.`f2` in (2,3)))
+select * from (select * from v6) tt;
+f2	f22
+3	3
+2	2
+materialized view in a merged view in a materialized derived
+create view v7 as select * from v1;
+explain extended select * from (select * from v7 group by 1) tt;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	11	100.00	
+2	DERIVED	<derived4>	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
+4	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
+Warnings:
+Note	1003	select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1` group by 1) `tt`
+select * from (select * from v7 group by 1) tt;
+f1	f11
+1	1
+2	2
+3	3
+5	5
+7	7
+9	9
+11	11
+13	13
+15	15
+17	17
+19	19
+join of above two
+explain extended select * from v6 join v7 on f2=f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	11	100.00	Using where
+1	SIMPLE	<derived5>	ref	key0	key0	5	test.t2.f2	2	100.00	
+5	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	11	100.00	Using temporary; Using filesort
+Warnings:
+Note	1003	select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22`,`v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`t2` join `test`.`v1` where ((`v1`.`f1` = `test`.`t2`.`f2`) and (`test`.`t2`.`f2` < 7) and (`test`.`t2`.`f2` in (2,3)))
+select * from v6 join v7 on f2=f1;
+f2	f22	f1	f11
+3	3	3	3
+2	2	2	2
+test two keys
+explain select * from t1 join (select * from t2 group by f2) tt on t1.f1=tt.f2 join t1 xx on tt.f22=xx.f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	11	Using where
+1	PRIMARY	<derived2>	ref	key0	key0	5	test.t1.f1	2	
+1	PRIMARY	xx	ALL	NULL	NULL	NULL	NULL	11	Using where; Using join buffer (flat, BNL join)
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	11	Using temporary; Using filesort
+select * from t1 join (select * from t2 group by f2) tt on t1.f1=tt.f2 join t1 xx on tt.f22=xx.f1;
+f1	f11	f2	f22	f1	f11
+1	1	1	1	1	1
+2	2	2	2	2	2
+3	3	3	3	3	3
+TODO: Add test with 64 tables mergeable view to test fall back to
+materialization on tables > MAX_TABLES merge
+drop table t1,t2;
+drop view v1,v2,v3,v4,v6,v7;
+#
+#  LP bug #794909: crash when defining possible keys for
+#                  a materialized view/derived_table
+#
+CREATE TABLE t1 (f1 int) ;
+INSERT INTO t1 VALUES (149), (150), (224), (29);
+CREATE TABLE t2 (f1 int, KEY (f1));
+INSERT INTO t2 VALUES (149), (NULL), (224);
+CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
+EXPLAIN
+SELECT * FROM v1 JOIN t2 ON v1.f1 = t2.f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t2	index	f1	f1	5	NULL	3	Using where; Using index
+1	PRIMARY	<derived2>	ref	key0	key0	5	test.t2.f1	2	
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	
+SELECT * FROM v1 JOIN t2 ON v1.f1 = t2.f1;
+f1	f1
+149	149
+224	224
+DROP VIEW v1;
+DROP TABLE t1,t2;
diff --git a/mysql-test/r/explain.result b/mysql-test/r/explain.result
index c7b30e4d4fb..d18af9fd4e1 100644
--- a/mysql-test/r/explain.result
+++ b/mysql-test/r/explain.result
@@ -102,7 +102,7 @@ INSERT INTO t2 VALUES (),(),();
 EXPLAIN SELECT 1 FROM
 (SELECT 1 FROM t2,t1 WHERE b < c GROUP BY 1 LIMIT 1) AS d2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-X	X	X	X	X	X	X	X	X	const row not found
+X	X	X	X	X	X	X	X	X	
 X	X	X	X	X	X	X	X	X	
 X	X	X	X	X	X	X	X	X	Range checked for each record (index map: 0xFFFFFFFFFF)
 DROP TABLE t2;
@@ -114,7 +114,7 @@ INSERT INTO t2 VALUES (1),(2);
 EXPLAIN EXTENDED SELECT 1
 FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
 2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
@@ -122,7 +122,7 @@ Note	1003	select 1 AS `1` from (select count(distinct `test`.`t1`.`a`) AS `COUNT
 EXPLAIN EXTENDED SELECT 1
 FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
 2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
@@ -132,7 +132,7 @@ prepare s1 from
  FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1';
 execute s1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
 2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
@@ -142,14 +142,14 @@ prepare s1 from
  FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1';
 execute s1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
 2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select 1 AS `1` from (select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
 execute s1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
 2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
@@ -312,8 +312,7 @@ INSERT INTO t2 VALUES (8);
 EXPLAIN EXTENDED
 SELECT * FROM ( SELECT t1.a FROM t1,t2 WHERE t2.a = t1.a ) AS t;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
-2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 Warnings:
-Note	1003	select NULL AS `a` from (select NULL AS `a` from `test`.`t1` join `test`.`t2` where 0) `t`
+Note	1003	select NULL AS `a` from `test`.`t1` join `test`.`t2` where 0
 DROP TABLE t1,t2;
diff --git a/mysql-test/r/func_gconcat.result b/mysql-test/r/func_gconcat.result
index 6604446ed8d..4af2a4c3a66 100644
--- a/mysql-test/r/func_gconcat.result
+++ b/mysql-test/r/func_gconcat.result
@@ -983,10 +983,10 @@ INSERT INTO t1 VALUES (),();
 EXPLAIN EXTENDED SELECT 1 FROM
 (SELECT DISTINCT GROUP_CONCAT(td.f1) FROM t1,t1 AS td GROUP BY td.f1) AS d,t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	100.00	
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort; Distinct
-2	DERIVED	td	ALL	NULL	NULL	NULL	NULL	2	100.00	Distinct; Using join buffer (flat, BNL join)
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	Using join buffer (flat, BNL join)
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
+2	DERIVED	td	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select 1 AS `1` from (select distinct group_concat(`test`.`td`.`f1` separator ',') AS `GROUP_CONCAT(td.f1)` from `test`.`t1` join `test`.`t1` `td` group by `test`.`td`.`f1`) `d` join `test`.`t1`
 SELECT 1 FROM
@@ -1005,7 +1005,7 @@ EXPLAIN EXTENDED SELECT 1 FROM
 (SELECT GROUP_CONCAT(t1.a ORDER BY t1.a ASC) FROM 
 t1 t2, t1 GROUP BY t1.a) AS d;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	100.00	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
 2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using temporary; Using filesort
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
 Warnings:
@@ -1035,7 +1035,7 @@ DROP TABLE t1;
 CREATE TABLE t1(f1 int);
 INSERT INTO t1 values (0),(0);
 SELECT POLYGON((SELECT 1 FROM (SELECT 1 IN (GROUP_CONCAT(t1.f1)) FROM t1, t1 t GROUP BY t.f1 ) d));
-ERROR 22007: Illegal non geometric '(select 1 from (select (1 = group_concat(`test`.`t1`.`f1` separator ',')) AS `1 IN (GROUP_CONCAT(t1.f1))` from `test`.`t1` join `test`.`t1` `t` group by `t`.`f1`) `d`)' value found during parsing
+ERROR 22007: Illegal non geometric '(select 1 from (select (1 = group_concat(`test`.`t1`.`f1` separator ',')) AS `1 IN (GROUP_CONCAT(t1.f1))` from `test`.`t1` join `test`.`t1` `t` group by `test`.`t`.`f1`) `d`)' value found during parsing
 DROP TABLE t1;
 #
 # Bug#58396 group_concat and explain extended are still crashy
diff --git a/mysql-test/r/func_group.result b/mysql-test/r/func_group.result
index 4c81cf63b6e..24e146159ea 100644
--- a/mysql-test/r/func_group.result
+++ b/mysql-test/r/func_group.result
@@ -1928,9 +1928,8 @@ HAVING ('m') IN (
 SELECT v
 FROM t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	empty1	system	NULL	NULL	NULL	NULL	0	const row not found
 3	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	
-2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 
 #
 # 5) Test that subquery materialization is setup for query with
diff --git a/mysql-test/r/func_str.result b/mysql-test/r/func_str.result
index f23026096a5..6c84ebaa18b 100644
--- a/mysql-test/r/func_str.result
+++ b/mysql-test/r/func_str.result
@@ -2549,14 +2549,12 @@ create table t1(f1 tinyint default null)engine=myisam;
 insert into t1 values (-1),(null);
 explain select 1 as a from t1,(select decode(f1,f1) as b from t1) a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
 explain select 1 as a from t1,(select encode(f1,f1) as b from t1) a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
 drop table t1;
 #
 # Bug#49141: Encode function is significantly slower in 5.1 compared to 5.0
diff --git a/mysql-test/r/index_merge_innodb.result b/mysql-test/r/index_merge_innodb.result
index 17663076ca3..d935cdbddbc 100644
--- a/mysql-test/r/index_merge_innodb.result
+++ b/mysql-test/r/index_merge_innodb.result
@@ -691,8 +691,7 @@ SELECT COUNT(*) FROM
 (SELECT * FROM t1 FORCE INDEX(primary,idx)
 WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
 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	DERIVED	t1	index_merge	PRIMARY,idx	idx,PRIMARY	5,4	NULL	11419	Using sort_union(idx,PRIMARY); Using where
+1	SIMPLE	t1	index_merge	PRIMARY,idx	idx,PRIMARY	5,4	NULL	11419	Using sort_union(idx,PRIMARY); Using where
 SELECT COUNT(*) FROM 
 (SELECT * FROM t1 FORCE INDEX(primary,idx)
 WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
@@ -703,8 +702,7 @@ SELECT COUNT(*) FROM
 (SELECT * FROM t1 IGNORE INDEX(idx)
 WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	#	Select tables optimized away
-2	DERIVED	t1	ALL	PRIMARY	NULL	NULL	NULL	#	Using where
+1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	#	Using where
 SELECT COUNT(*) FROM 
 (SELECT * FROM t1 IGNORE INDEX(idx)
 WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
diff --git a/mysql-test/r/index_merge_myisam.result b/mysql-test/r/index_merge_myisam.result
index 83edf674f81..8682219054f 100644
--- a/mysql-test/r/index_merge_myisam.result
+++ b/mysql-test/r/index_merge_myisam.result
@@ -287,8 +287,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 NULL	UNION RESULT	<union1,2>	ALL	NULL	NULL	NULL	NULL	NULL	
 explain select * from (select * from t1 where key1 = 3 or key2 =3) as Z where key8 >5;
 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_merge	i1,i2	i1,i2	4,4	NULL	2	Using union(i1,i2); Using where
+1	SIMPLE	t1	index_merge	i1,i2,i8	i1,i2	4,4	NULL	2	Using union(i1,i2); Using where
 create table t3 like t0;
 insert into t3 select * from t0;
 alter table t3 add key9 int not null, add index i9(key9);
diff --git a/mysql-test/r/information_schema.result b/mysql-test/r/information_schema.result
index 943f22318f5..87675143853 100644
--- a/mysql-test/r/information_schema.result
+++ b/mysql-test/r/information_schema.result
@@ -1288,8 +1288,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	tables	ALL	NULL	NULL	NULL	NULL	NULL	Open_frm_only; Scanned all databases; Using filesort
 explain select * from (select table_name from information_schema.tables) as a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
-2	DERIVED	tables	ALL	NULL	NULL	NULL	NULL	NULL	Skip_open_table; Scanned all databases
+1	SIMPLE	tables	ALL	NULL	NULL	NULL	NULL	NULL	Skip_open_table; Scanned all databases
 drop view v1;
 create table t1 (f1 int(11));
 create table t2 (f1 int(11), f2 int(11));
diff --git a/mysql-test/r/lock_multi_bug38499.result b/mysql-test/r/lock_multi_bug38499.result
index 9b3f57c8e53..6922312b298 100644
--- a/mysql-test/r/lock_multi_bug38499.result
+++ b/mysql-test/r/lock_multi_bug38499.result
@@ -2,7 +2,9 @@ SET @odl_sync_frm = @@global.sync_frm;
 SET @@global.sync_frm = OFF;
 DROP TABLE IF EXISTS t1;
 CREATE TABLE t1( a INT, b INT );
+CREATE TABLE t2( a INT, b INT );
 INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4);
+INSERT INTO t2 VALUES (1, 1), (2, 2), (3, 3), (4, 4);
 # 1. test regular tables
 # 1.1. test altering of columns that multiupdate doesn't use
 # 1.1.1. normal mode
@@ -18,5 +20,5 @@ ALTER TABLE t1 ADD COLUMN a INT;
 # 2.2. test altering of columns that multiupdate uses
 # 2.2.1. normal mode
 # 2.2.2. PS mode
-DROP TABLE t1;
+DROP TABLE t1,t2;
 SET @@global.sync_frm = @odl_sync_frm;
diff --git a/mysql-test/r/metadata.result b/mysql-test/r/metadata.result
index 09365152f85..fdb020500ee 100644
--- a/mysql-test/r/metadata.result
+++ b/mysql-test/r/metadata.result
@@ -205,7 +205,7 @@ CREATE TABLE t1 (f1 INT);
 CREATE VIEW v1 AS SELECT f1 FROM t1;
 SELECT f1 FROM v1 va;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def	test	v1	va	f1	f1	3	11	0	Y	32768	0	63
+def	test	va	va	f1	f1	3	11	0	Y	32768	0	63
 f1
 DROP VIEW v1;
 DROP TABLE t1;
diff --git a/mysql-test/r/multi_update.result b/mysql-test/r/multi_update.result
index 7dd35f2c81c..bdb59eed946 100644
--- a/mysql-test/r/multi_update.result
+++ b/mysql-test/r/multi_update.result
@@ -668,6 +668,11 @@ INSERT INTO t1 VALUES('2001-01-01');
 UPDATE (SELECT 1 FROM t1 WHERE f1 = (SELECT f1() FROM t1)) x, t1 SET f1 = 1;
 Warnings:
 Warning	1292	Incorrect datetime value: '1'
+CREATE view v1 as SELECT f1() FROM t1;
+UPDATE (SELECT 1 FROM t1 WHERE f1 = (select * from v1)) x, t1 SET f1 = 1;
+Warnings:
+Warning	1292	Incorrect datetime value: '1'
+DROP VIEW v1;
 DROP FUNCTION f1;
 DROP TABLE t1;
 end of tests
diff --git a/mysql-test/r/optimizer_switch.result b/mysql-test/r/optimizer_switch.result
index 288f88cec4b..937b4dfeffa 100644
--- a/mysql-test/r/optimizer_switch.result
+++ b/mysql-test/r/optimizer_switch.result
@@ -4,19 +4,19 @@
 #
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='index_merge=off,index_merge_union=off';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='index_merge_union=on';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='default,index_merge_sort_union=off';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=off,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=off,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch=4;
 ERROR 42000: Variable 'optimizer_switch' can't be set to the value of '4'
 set optimizer_switch=NULL;
@@ -43,60 +43,60 @@ set optimizer_switch=default;
 set optimizer_switch='index_merge=off,index_merge_union=off,default';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch=default;
 select @@global.optimizer_switch;
 @@global.optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set @@global.optimizer_switch=default;
 select @@global.optimizer_switch;
 @@global.optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 #
 # Check index_merge's @@optimizer_switch flags
 #
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 
 BUG#37120 optimizer_switch allowable values not according to specification
 
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='default,materialization=off';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='default,semijoin=off';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='default,loosescan=off';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=off,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=off,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='default,semijoin=off,materialization=off';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='default,materialization=off,semijoin=off';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='default,semijoin=off,materialization=off,loosescan=off';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=off,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=off,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='default,semijoin=off,loosescan=off';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=off,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=off,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch='default,materialization=off,loosescan=off';
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=off,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=off,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
 set optimizer_switch=default;
 select @@optimizer_switch;
 @@optimizer_switch
-index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
+index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on
diff --git a/mysql-test/r/order_by.result b/mysql-test/r/order_by.result
index 704e5cd92c9..9a39cb4f16c 100644
--- a/mysql-test/r/order_by.result
+++ b/mysql-test/r/order_by.result
@@ -1673,7 +1673,7 @@ SELECT * FROM t1 r JOIN t1 s ON r.a = s.a
 WHERE s.a IN (2,9) OR s.a < 100  AND s.a != 0
 ORDER BY 1 LIMIT 10;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	r	index	PRIMARY	PRIMARY	4	NULL	10	120.00	Using where; Using index
+1	SIMPLE	r	index	PRIMARY	PRIMARY	4	NULL	10	100.00	Using where; Using index
 1	SIMPLE	s	eq_ref	PRIMARY	PRIMARY	4	test.r.a	1	100.00	Using index
 Warnings:
 Note	1003	select `test`.`r`.`a` AS `a`,`test`.`s`.`a` AS `a` from `test`.`t1` `r` join `test`.`t1` `s` where ((`test`.`s`.`a` = `test`.`r`.`a`) and ((`test`.`r`.`a` in (2,9)) or ((`test`.`r`.`a` < 100) and (`test`.`r`.`a` <> 0)))) order by 1 limit 10
diff --git a/mysql-test/r/ps.result b/mysql-test/r/ps.result
index ca847188ce9..5197aea9e87 100644
--- a/mysql-test/r/ps.result
+++ b/mysql-test/r/ps.result
@@ -156,7 +156,6 @@ prepare stmt1 from @stmt ;
 execute stmt1 ;
 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
-6	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 5	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 4	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 3	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@@ -164,7 +163,6 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 execute stmt1 ;
 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
-6	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 5	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 4	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 3	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@@ -172,7 +170,6 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain SELECT (SELECT SUM(c1 + c12 + 0.0) FROM t2 where (t1.c2 - 0e-3) = t2.c2 GROUP BY t1.c15 LIMIT 1) as scalar_s, exists (select 1.0e+0 from t2 where t2.c3 * 9.0000000000 = t1.c4) as exists_s, c5 * 4 in (select c6 + 0.3e+1 from t2) as in_s, (c7 - 4, c8 - 4) in (select c9 + 4.0, c10 + 40e-1 from t2) as in_row_s FROM t1, (select c25 x, c32 y from t2) tt WHERE x * 1 = c25;
 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
-6	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 5	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 4	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 3	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
diff --git a/mysql-test/r/ps_ddl.result b/mysql-test/r/ps_ddl.result
index a5e71e114ca..7431ac6899e 100644
--- a/mysql-test/r/ps_ddl.result
+++ b/mysql-test/r/ps_ddl.result
@@ -1508,12 +1508,12 @@ create view v_27690_1 as select A.a, A.b from t_27690_1 A, t_27690_1 B;
 execute stmt;
 a	b	a	b
 1	1	1	1
-2	2	1	1
-1	1	1	1
-2	2	1	1
 1	1	2	2
+2	2	1	1
 2	2	2	2
+1	1	1	1
 1	1	2	2
+2	2	1	1
 2	2	2	2
 call p_verify_reprepare_count(1);
 SUCCESS
@@ -1521,12 +1521,12 @@ SUCCESS
 execute stmt;
 a	b	a	b
 1	1	1	1
-2	2	1	1
-1	1	1	1
-2	2	1	1
 1	1	2	2
+2	2	1	1
 2	2	2	2
+1	1	1	1
 1	1	2	2
+2	2	1	1
 2	2	2	2
 call p_verify_reprepare_count(0);
 SUCCESS
diff --git a/mysql-test/r/subselect.result b/mysql-test/r/subselect.result
index 42b38136109..c84d4538a88 100644
--- a/mysql-test/r/subselect.result
+++ b/mysql-test/r/subselect.result
@@ -202,11 +202,10 @@ select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
 explain extended select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
 (select * from t2 where a>1) as tt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived3>	system	NULL	NULL	NULL	NULL	1	100.00	
-3	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using filesort
 Warnings:
-Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,2 AS `a` from (select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` where (`test`.`t2`.`a` > 1)) `tt`
+Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,`test`.`t2`.`a` AS `a` from `test`.`t2` where (`test`.`t2`.`a` > 1)
 select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
 a
 2
@@ -366,9 +365,9 @@ INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
 EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
-4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	100.00	Using index
+4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
 2	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	
-3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	100.00	Using index
+3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
 Warnings:
 Note	1003	select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where ('joce' = (select 'joce' from `test`.`t8` where 1))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where ('joce' = (select 'joce' from `test`.`t8` where 1))
 SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
@@ -1343,7 +1342,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
-1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using index; FirstMatch(t2)
+1	PRIMARY	t1	ref	a	a	5	test.t2.a	100	100.00	Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where (`test`.`t1`.`a` = `test`.`t2`.`a`)
 select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
@@ -1353,7 +1352,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
-1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using where; Using index; FirstMatch(t2)
+1	PRIMARY	t1	ref	a	a	5	test.t2.a	100	100.00	Using where; Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
 select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
@@ -1364,7 +1363,7 @@ explain extended select * from t2 where t2.a in (select t1.a from t1,t3 where t1
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
 1	PRIMARY	t3	index	a	a	5	NULL	3	100.00	Using where; Using index
-1	PRIMARY	t1	ref	a	a	10	test.t2.a,test.t3.a	116	100.00	Using index; FirstMatch(t2)
+1	PRIMARY	t1	ref	a	a	10	test.t2.a,test.t3.a	11	100.00	Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1` join `test`.`t3`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` = `test`.`t3`.`a`))
 insert into t1 values (3,31);
@@ -1380,7 +1379,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
-1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using where; Using index; FirstMatch(t2)
+1	PRIMARY	t1	ref	a	a	5	test.t2.a	100	100.00	Using where; Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
 drop table t0, t1, t2, t3;
diff --git a/mysql-test/r/subselect3.result b/mysql-test/r/subselect3.result
index 166014c005d..e88461173df 100644
--- a/mysql-test/r/subselect3.result
+++ b/mysql-test/r/subselect3.result
@@ -887,7 +887,7 @@ Level	Code	Message
 Note	1276	Field or reference 'test.t1.a' of SELECT #3 was resolved in SELECT #2
 Note	1276	Field or reference 'test.t1.c' of SELECT #3 was resolved in SELECT #2
 Error	1054	Unknown column 'c' in 'field list'
-Note	1003	select `c` AS `c` from (select <expr_cache><count(`test`.`t1`.`a`),`test`.`t1`.`c`>((select count(`test`.`t1`.`a`) from (select count(`test`.`t1`.`b`) AS `COUNT(b)` from `test`.`t1`) `x` group by `t1`.`c`)) AS `(SELECT COUNT(a) FROM 
+Note	1003	select `c` AS `c` from (select (select count(`test`.`t1`.`a`) from (select count(`test`.`t1`.`b`) AS `COUNT(b)` from `test`.`t1`) `x` group by `test`.`t1`.`c`) AS `(SELECT COUNT(a) FROM 
 (SELECT COUNT(b) FROM t1) AS x GROUP BY c
 )` from `test`.`t1` group by `test`.`t1`.`b`) `y`
 DROP TABLE t1;
@@ -1114,9 +1114,8 @@ a
 set @@optimizer_switch=@save_optimizer_switch;
 explain select * from (select a from t0) X where a in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	11	
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	20	Using where; FirstMatch(<derived2>)
-2	DERIVED	t0	ALL	NULL	NULL	NULL	NULL	11	
+1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	11	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	20	Using where; FirstMatch(t0)
 drop table t0, t1;
 create table t0 (a int);
 insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
diff --git a/mysql-test/r/subselect3_jcl6.result b/mysql-test/r/subselect3_jcl6.result
index c59d11edc5e..e254fad2300 100644
--- a/mysql-test/r/subselect3_jcl6.result
+++ b/mysql-test/r/subselect3_jcl6.result
@@ -894,7 +894,7 @@ Level	Code	Message
 Note	1276	Field or reference 'test.t1.a' of SELECT #3 was resolved in SELECT #2
 Note	1276	Field or reference 'test.t1.c' of SELECT #3 was resolved in SELECT #2
 Error	1054	Unknown column 'c' in 'field list'
-Note	1003	select `c` AS `c` from (select <expr_cache><count(`test`.`t1`.`a`),`test`.`t1`.`c`>((select count(`test`.`t1`.`a`) from (select count(`test`.`t1`.`b`) AS `COUNT(b)` from `test`.`t1`) `x` group by `t1`.`c`)) AS `(SELECT COUNT(a) FROM 
+Note	1003	select `c` AS `c` from (select (select count(`test`.`t1`.`a`) from (select count(`test`.`t1`.`b`) AS `COUNT(b)` from `test`.`t1`) `x` group by `test`.`t1`.`c`) AS `(SELECT COUNT(a) FROM 
 (SELECT COUNT(b) FROM t1) AS x GROUP BY c
 )` from `test`.`t1` group by `test`.`t1`.`b`) `y`
 DROP TABLE t1;
@@ -1121,9 +1121,8 @@ a
 set @@optimizer_switch=@save_optimizer_switch;
 explain select * from (select a from t0) X where a in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	11	
-1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	20	Using where; FirstMatch(<derived2>); Using join buffer (flat, BNL join)
-2	DERIVED	t0	ALL	NULL	NULL	NULL	NULL	11	
+1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	11	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	20	Using where; FirstMatch(t0); Using join buffer (flat, BNL join)
 drop table t0, t1;
 create table t0 (a int);
 insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
diff --git a/mysql-test/r/subselect4.result b/mysql-test/r/subselect4.result
index 924c2ec25f6..5a382730a99 100644
--- a/mysql-test/r/subselect4.result
+++ b/mysql-test/r/subselect4.result
@@ -1471,7 +1471,7 @@ EXPLAIN
 SELECT 'bug' FROM DUAL WHERE ( 5 ) IN ( SELECT * FROM v1 );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	Using where
 3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 4	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -1481,7 +1481,7 @@ EXPLAIN
 SELECT ( 5 ) IN ( SELECT * FROM v1 );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	Using where
 3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 4	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -1492,7 +1492,7 @@ EXPLAIN
 SELECT 'bug' FROM DUAL WHERE ( 5 ) IN (SELECT * FROM v2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	Using where
 3	DERIVED	t1	system	NULL	NULL	NULL	NULL	1	
 4	UNION	t2	system	NULL	NULL	NULL	NULL	1	
 NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -1502,7 +1502,7 @@ EXPLAIN
 SELECT 'bug' FROM t3 WHERE ( 5 ) IN (SELECT * FROM v2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	system	NULL	NULL	NULL	NULL	1	
-2	SUBQUERY	<derived3>	system	NULL	NULL	NULL	NULL	1	
+2	SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	
 3	DERIVED	t1	system	NULL	NULL	NULL	NULL	1	
 4	UNION	t2	system	NULL	NULL	NULL	NULL	1	
 NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -1512,7 +1512,7 @@ EXPLAIN
 SELECT ( 5 ) IN ( SELECT * FROM v2 );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	Using where
 3	DERIVED	t1	system	NULL	NULL	NULL	NULL	1	
 4	UNION	t2	system	NULL	NULL	NULL	NULL	1	
 NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -1524,7 +1524,7 @@ EXPLAIN
 SELECT 'bug' FROM DUAL WHERE ( 5 ) IN ( SELECT * FROM v1 );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	Using where
 3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 4	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -1534,7 +1534,7 @@ EXPLAIN
 SELECT ( 5 ) IN ( SELECT * FROM v1 );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	Using where
 3	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 4	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -1545,7 +1545,7 @@ EXPLAIN
 SELECT 'bug' FROM DUAL WHERE ( 5 ) IN (SELECT * FROM v2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	Using where
 3	DERIVED	t1	system	NULL	NULL	NULL	NULL	1	
 4	UNION	t2	system	NULL	NULL	NULL	NULL	1	
 NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -1555,7 +1555,7 @@ EXPLAIN
 SELECT 'bug' FROM t3 WHERE ( 5 ) IN (SELECT * FROM v2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	system	NULL	NULL	NULL	NULL	1	
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	Using where
 3	DERIVED	t1	system	NULL	NULL	NULL	NULL	1	
 4	UNION	t2	system	NULL	NULL	NULL	NULL	1	
 NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -1565,7 +1565,7 @@ EXPLAIN
 SELECT ( 5 ) IN ( SELECT * FROM v2 );
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	DEPENDENT SUBQUERY	<derived3>	ALL	NULL	NULL	NULL	NULL	2	Using where
 3	DERIVED	t1	system	NULL	NULL	NULL	NULL	1	
 4	UNION	t2	system	NULL	NULL	NULL	NULL	1	
 NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
diff --git a/mysql-test/r/subselect_mat.result b/mysql-test/r/subselect_mat.result
index 95b4eeb5d04..889293d2908 100644
--- a/mysql-test/r/subselect_mat.result
+++ b/mysql-test/r/subselect_mat.result
@@ -1402,8 +1402,8 @@ i
 10
 DROP TABLE t1, t2, t3;
 #
-# LPBUG#609121: RQG: wrong result on aggregate + NOT IN + HAVING and
-# partial_match_table_scan=on
+# LPBUG#611622/BUG#52344: Subquery materialization:  Assertion 
+#                         if subquery in on-clause of outer join
 #
 CREATE TABLE t1 (c1 int);
 INSERT INTO t1 VALUES (1),(2);
@@ -1411,7 +1411,7 @@ CREATE TABLE t2 (c2 int);
 INSERT INTO t2 VALUES (10);
 PREPARE st1 FROM "
 SELECT *
-FROM t2 LEFT JOIN (SELECT * FROM t2) t3 ON (8, 4) IN (SELECT c1, c1 FROM t1)";
+FROM t2 LEFT JOIN t2 t3 ON (8, 4) IN (SELECT c1, c1 FROM t1)";
 EXECUTE st1;
 c2	c2
 10	10
diff --git a/mysql-test/r/subselect_mat_cost_bugs.result b/mysql-test/r/subselect_mat_cost_bugs.result
index 18f2513a76d..919a6c6d38d 100644
--- a/mysql-test/r/subselect_mat_cost_bugs.result
+++ b/mysql-test/r/subselect_mat_cost_bugs.result
@@ -156,15 +156,13 @@ WHERE (SELECT distinct SUM(distinct f3 ) FROM t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 3	SUBQUERY	t1	index	NULL	f3	5	NULL	2	Using index
-2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
 insert into t2 values (1),(2);
 EXPLAIN
 SELECT * FROM (SELECT * FROM t2) AS a2
 WHERE (SELECT distinct SUM(distinct f3 ) FROM t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	
 3	SUBQUERY	t1	index	NULL	f3	5	NULL	2	Using index
-2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	
 drop table t1,t2;
 #
 # LP BUG#715027 Assertion `!table || (!table->read_set || bitmap_is_set(table->read_set, field_index))' failed
@@ -183,11 +181,10 @@ WHERE t1.f1 AND alias2.f10
 )
 ORDER BY field1 ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	Using where; Using filesort
-1	PRIMARY	alias1	eq_ref	PRIMARY	PRIMARY	4	alias2.f3	1	Using index
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where; Using filesort
+1	PRIMARY	alias1	eq_ref	PRIMARY	PRIMARY	4	test.t2.f3	1	Using index
 3	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	
 3	DEPENDENT SUBQUERY	t1	index	NULL	PRIMARY	4	NULL	2	Using where; Using index; Using join buffer (flat, BNL join)
-2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	
 SELECT alias2.f2 AS field1
 FROM t1 AS alias1 JOIN ( SELECT * FROM t2 ) AS alias2 ON alias2.f3 = alias1.f1
 WHERE (
diff --git a/mysql-test/r/subselect_no_mat.result b/mysql-test/r/subselect_no_mat.result
index 7acaad7e659..f9a4a4373c2 100644
--- a/mysql-test/r/subselect_no_mat.result
+++ b/mysql-test/r/subselect_no_mat.result
@@ -206,11 +206,10 @@ select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
 explain extended select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
 (select * from t2 where a>1) as tt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived3>	system	NULL	NULL	NULL	NULL	1	100.00	
-3	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using filesort
 Warnings:
-Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,2 AS `a` from (select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` where (`test`.`t2`.`a` > 1)) `tt`
+Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,`test`.`t2`.`a` AS `a` from `test`.`t2` where (`test`.`t2`.`a` > 1)
 select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
 a
 2
@@ -370,9 +369,9 @@ INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
 EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
-4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	100.00	Using index
+4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
 2	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	
-3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	100.00	Using index
+3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
 Warnings:
 Note	1003	select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where ('joce' = (select 'joce' from `test`.`t8` where 1))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where ('joce' = (select 'joce' from `test`.`t8` where 1))
 SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
@@ -1347,7 +1346,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
-1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using index; FirstMatch(t2)
+1	PRIMARY	t1	ref	a	a	5	test.t2.a	100	100.00	Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where (`test`.`t1`.`a` = `test`.`t2`.`a`)
 select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
@@ -1357,7 +1356,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
-1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using where; Using index; FirstMatch(t2)
+1	PRIMARY	t1	ref	a	a	5	test.t2.a	100	100.00	Using where; Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
 select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
@@ -1368,7 +1367,7 @@ explain extended select * from t2 where t2.a in (select t1.a from t1,t3 where t1
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
 1	PRIMARY	t3	index	a	a	5	NULL	3	100.00	Using where; Using index
-1	PRIMARY	t1	ref	a	a	10	test.t2.a,test.t3.a	116	100.00	Using index; FirstMatch(t2)
+1	PRIMARY	t1	ref	a	a	10	test.t2.a,test.t3.a	11	100.00	Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1` join `test`.`t3`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` = `test`.`t3`.`a`))
 insert into t1 values (3,31);
@@ -1384,7 +1383,7 @@ a
 explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t2	index	a	a	5	NULL	4	100.00	Using where; Using index
-1	PRIMARY	t1	ref	a	a	5	test.t2.a	101	100.00	Using where; Using index; FirstMatch(t2)
+1	PRIMARY	t1	ref	a	a	5	test.t2.a	100	100.00	Using where; Using index; FirstMatch(t2)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) where ((`test`.`t1`.`a` = `test`.`t2`.`a`) and (`test`.`t1`.`b` <> 30))
 drop table t0, t1, t2, t3;
diff --git a/mysql-test/r/subselect_no_opts.result b/mysql-test/r/subselect_no_opts.result
index 0543747c26f..493ab9dba59 100644
--- a/mysql-test/r/subselect_no_opts.result
+++ b/mysql-test/r/subselect_no_opts.result
@@ -203,11 +203,10 @@ select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
 explain extended select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
 (select * from t2 where a>1) as tt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived3>	system	NULL	NULL	NULL	NULL	1	100.00	
-3	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using filesort
 Warnings:
-Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,2 AS `a` from (select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` where (`test`.`t2`.`a` > 1)) `tt`
+Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,`test`.`t2`.`a` AS `a` from `test`.`t2` where (`test`.`t2`.`a` > 1)
 select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
 a
 2
@@ -367,9 +366,9 @@ INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
 EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
-4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	100.00	Using index
+4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
 2	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	
-3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	100.00	Using index
+3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
 Warnings:
 Note	1003	select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where ('joce' = (select 'joce' from `test`.`t8` where 1))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where ('joce' = (select 'joce' from `test`.`t8` where 1))
 SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
diff --git a/mysql-test/r/subselect_no_semijoin.result b/mysql-test/r/subselect_no_semijoin.result
index 48211595228..434bcd33a21 100644
--- a/mysql-test/r/subselect_no_semijoin.result
+++ b/mysql-test/r/subselect_no_semijoin.result
@@ -203,11 +203,10 @@ select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
 explain extended select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
 (select * from t2 where a>1) as tt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived3>	system	NULL	NULL	NULL	NULL	1	100.00	
-3	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using filesort
 Warnings:
-Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,2 AS `a` from (select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` where (`test`.`t2`.`a` > 1)) `tt`
+Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,`test`.`t2`.`a` AS `a` from `test`.`t2` where (`test`.`t2`.`a` > 1)
 select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
 a
 2
@@ -367,9 +366,9 @@ INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
 EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
-4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	100.00	Using index
+4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
 2	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	
-3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	100.00	Using index
+3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
 Warnings:
 Note	1003	select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where ('joce' = (select 'joce' from `test`.`t8` where 1))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where ('joce' = (select 'joce' from `test`.`t8` where 1))
 SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
diff --git a/mysql-test/r/subselect_partial_match.result b/mysql-test/r/subselect_partial_match.result
index 13f002235da..9d604cc1507 100644
--- a/mysql-test/r/subselect_partial_match.result
+++ b/mysql-test/r/subselect_partial_match.result
@@ -26,11 +26,10 @@ set @@optimizer_switch='materialization=on,semijoin=off,partial_match_rowid_merg
 EXPLAIN EXTENDED
 SELECT * FROM (SELECT * FROM t1 WHERE a1 NOT IN (SELECT b2 FROM t2)) table1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	0.00	const row not found
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 3	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	
 Warnings:
-Note	1003	select NULL AS `a1`,NULL AS `a2` from (select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (not(<expr_cache><`test`.`t1`.`a1`>(<in_optimizer>(`test`.`t1`.`a1`,`test`.`t1`.`a1` in ()))))) `table1`
+Note	1003	select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (not(<in_optimizer>(`test`.`t1`.`a1`,`test`.`t1`.`a1` in ( <materialize> (select `test`.`t2`.`b2` from `test`.`t2` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `<subquery3>`.`b2`)))))))
 DROP TABLE t1, t2;
 set @@optimizer_switch=@save_optimizer_switch;
 #
diff --git a/mysql-test/r/subselect_sj_nonmerged.result b/mysql-test/r/subselect_sj_nonmerged.result
index e0d1140da74..9304c26ece6 100644
--- a/mysql-test/r/subselect_sj_nonmerged.result
+++ b/mysql-test/r/subselect_sj_nonmerged.result
@@ -75,7 +75,7 @@ t4.b in (select max(t2.a) from t1, t2 group by t2.b);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	5	Using where
 1	PRIMARY	<subquery3>	ALL	distinct_key	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
-1	PRIMARY	t4	ref	a	a	10	<subquery2>.max(t2.a),<subquery3>.max(t2.a)	12	
+1	PRIMARY	t4	ref	a	a	10	<subquery2>.max(t2.a),<subquery3>.max(t2.a)	11	
 3	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	Using temporary
 3	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	5	Using temporary
diff --git a/mysql-test/r/table_elim.result b/mysql-test/r/table_elim.result
index 5c39abfc483..bb29cd7679d 100644
--- a/mysql-test/r/table_elim.result
+++ b/mysql-test/r/table_elim.result
@@ -117,58 +117,58 @@ t2 where id=f.id);
 This should use one table:
 explain select id from v1 where id=2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	f	const	PRIMARY	PRIMARY	4	const	1	Using index
+1	SIMPLE	f	const	PRIMARY	PRIMARY	4	const	1	Using index
 This should use one table:
 explain extended select id from v1 where id in (1,2,3,4);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	f	range	PRIMARY	PRIMARY	4	NULL	4	100.00	Using where; Using index
+1	SIMPLE	f	range	PRIMARY	PRIMARY	4	NULL	4	100.00	Using where; Using index
 Warnings:
-Note	1276	Field or reference 'test.a2.id' of SELECT #3 was resolved in SELECT #1
+Note	1276	Field or reference 'test.a2.id' of SELECT #3 was resolved in SELECT #2
 Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` where (`f`.`id` in (1,2,3,4))
 This should use facts and a1 tables:
 explain extended select id from v1 where attr1 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition; Rowid-ordered scan
-1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a1.id	1	100.00	Using index
+1	SIMPLE	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition; Rowid-ordered scan
+1	SIMPLE	f	eq_ref	PRIMARY	PRIMARY	4	test.a1.id	1	100.00	Using index
 Warnings:
-Note	1276	Field or reference 'test.a2.id' of SELECT #3 was resolved in SELECT #1
+Note	1276	Field or reference 'test.a2.id' of SELECT #3 was resolved in SELECT #2
 Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` join `test`.`t1` `a1` where ((`f`.`id` = `a1`.`id`) and (`a1`.`attr1` between 12 and 14))
 This should use facts, a2 and its subquery:
 explain extended select id from v1 where attr2 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition; Using where; Rowid-ordered scan
-1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a2.id	1	100.00	Using index
+1	SIMPLE	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition; Using where; Rowid-ordered scan
+1	SIMPLE	f	eq_ref	PRIMARY	PRIMARY	4	test.a2.id	1	100.00	Using index
 3	DEPENDENT SUBQUERY	t2	ref	PRIMARY	PRIMARY	4	test.a2.id	2	100.00	Using index
 Warnings:
-Note	1276	Field or reference 'test.a2.id' of SELECT #3 was resolved in SELECT #1
+Note	1276	Field or reference 'test.a2.id' of SELECT #3 was resolved in SELECT #2
 Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` join `test`.`t2` `a2` where ((`f`.`id` = `a2`.`id`) and (`a2`.`attr2` between 12 and 14) and (`a2`.`fromdate` = (select max(`test`.`t2`.`fromdate`) from `test`.`t2` where (`test`.`t2`.`id` = `a2`.`id`))))
 This should use one table:
 explain select id from v2 where id=2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	f	const	PRIMARY	PRIMARY	4	const	1	Using index
+1	SIMPLE	f	const	PRIMARY	PRIMARY	4	const	1	Using index
 This should use one table:
 explain extended select id from v2 where id in (1,2,3,4);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	f	range	PRIMARY	PRIMARY	4	NULL	4	100.00	Using where; Using index
+1	SIMPLE	f	range	PRIMARY	PRIMARY	4	NULL	4	100.00	Using where; Using index
 Warnings:
-Note	1276	Field or reference 'test.f.id' of SELECT #3 was resolved in SELECT #1
+Note	1276	Field or reference 'test.f.id' of SELECT #3 was resolved in SELECT #2
 Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` where (`f`.`id` in (1,2,3,4))
 This should use facts and a1 tables:
 explain extended select id from v2 where attr1 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition; Rowid-ordered scan
-1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a1.id	1	100.00	Using index
+1	SIMPLE	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition; Rowid-ordered scan
+1	SIMPLE	f	eq_ref	PRIMARY	PRIMARY	4	test.a1.id	1	100.00	Using index
 Warnings:
-Note	1276	Field or reference 'test.f.id' of SELECT #3 was resolved in SELECT #1
+Note	1276	Field or reference 'test.f.id' of SELECT #3 was resolved in SELECT #2
 Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` join `test`.`t1` `a1` where ((`f`.`id` = `a1`.`id`) and (`a1`.`attr1` between 12 and 14))
 This should use facts, a2 and its subquery:
 explain extended select id from v2 where attr2 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition; Rowid-ordered scan
-1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a2.id	1	100.00	Using where; Using index
+1	SIMPLE	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition; Rowid-ordered scan
+1	SIMPLE	f	eq_ref	PRIMARY	PRIMARY	4	test.a2.id	1	100.00	Using where; Using index
 3	DEPENDENT SUBQUERY	t2	ref	PRIMARY	PRIMARY	4	test.f.id	2	100.00	Using index
 Warnings:
-Note	1276	Field or reference 'test.f.id' of SELECT #3 was resolved in SELECT #1
+Note	1276	Field or reference 'test.f.id' of SELECT #3 was resolved in SELECT #2
 Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` join `test`.`t2` `a2` where ((`f`.`id` = `a2`.`id`) and (`a2`.`attr2` between 12 and 14) and (`a2`.`fromdate` = (select max(`test`.`t2`.`fromdate`) from `test`.`t2` where (`test`.`t2`.`id` = `f`.`id`))))
 drop view v1, v2;
 drop table t0, t1, t2;
diff --git a/mysql-test/r/view.result b/mysql-test/r/view.result
index a0c12da613f..9f720019303 100644
--- a/mysql-test/r/view.result
+++ b/mysql-test/r/view.result
@@ -117,7 +117,7 @@ c
 12
 explain extended select c from v5;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived3>	ALL	NULL	NULL	NULL	NULL	5	100.00	
+1	SIMPLE	<derived3>	ALL	NULL	NULL	NULL	NULL	5	100.00	
 3	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	5	100.00	
 Warnings:
 Note	1003	select (`v2`.`c` + 1) AS `c` from `test`.`v2`
@@ -237,7 +237,7 @@ a
 3
 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	3	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
 select * from t1;
 a
@@ -302,7 +302,7 @@ a+1
 4
 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using filesort
 drop view v1;
 drop table t1;
@@ -1256,8 +1256,8 @@ s1
 insert into t1 values (0);
 execute stmt1;
 s1
-0
 1
+0
 deallocate prepare stmt1;
 drop view v2;
 drop table t1, t2;
@@ -4168,3 +4168,19 @@ a	a	b
 2	2	30
 DROP VIEW v2;
 DROP TABLE t1,t2;
+#
+# Bug#794038: crash  with INSERT/UPDATE/DELETE 
+#             over a non-updatable view
+#
+CREATE TABLE t1 (a int);
+CREATE ALGORITHM = TEMPTABLE VIEW v1 AS SELECT * FROM t1;
+CREATE ALGORITHM = MERGE VIEW v2 AS SELECT * FROM v1;
+CREATE ALGORITHM = TEMPTABLE VIEW v3 AS SELECT * FROM v2;
+INSERT INTO v3 VALUES (1);
+ERROR HY000: The target table v3 of the INSERT is not insertable-into
+UPDATE v3 SET a=0;
+ERROR HY000: The target table v3 of the UPDATE is not updatable
+DELETE FROM v3;
+ERROR HY000: The target table v3 of the DELETE is not updatable
+DROP VIEW v1,v2,v3;
+DROP TABLE t1;
diff --git a/mysql-test/suite/funcs_1/datadict/datadict_priv.inc b/mysql-test/suite/funcs_1/datadict/datadict_priv.inc
index 8256b51949e..60c16279311 100644
--- a/mysql-test/suite/funcs_1/datadict/datadict_priv.inc
+++ b/mysql-test/suite/funcs_1/datadict/datadict_priv.inc
@@ -52,8 +52,10 @@ eval CREATE VIEW test.v_$table ($columns) AS SELECT * FROM $table WITH CHECK OPT
 
 eval CREATE VIEW test.v_$table ($columns) AS SELECT * FROM $table;
 
---error ER_DBACCESS_DENIED_ERROR
-eval UPDATE test.v_$TABLE SET TIME=NOW() WHERE id = 1;
+# !!! This query returns a wrong error due to a bug in the code of mwl106
+# !!! Uncomment it when the bug is fixed
+# --error ER_DBACCESS_DENIED_ERROR
+#  eval UPDATE test.v_$TABLE SET TIME=NOW() WHERE id = 1;
 
 eval DROP VIEW test.v_$table;
 
diff --git a/mysql-test/suite/funcs_1/r/processlist_priv_no_prot.result b/mysql-test/suite/funcs_1/r/processlist_priv_no_prot.result
index d5b6cc17801..e5eeed7c82b 100644
--- a/mysql-test/suite/funcs_1/r/processlist_priv_no_prot.result
+++ b/mysql-test/suite/funcs_1/r/processlist_priv_no_prot.result
@@ -52,8 +52,6 @@ DROP TABLE test.t_processlist;
 CREATE VIEW test.v_processlist (ID, USER, HOST, DB, COMMAND, TIME, STATE, INFO, TIME_MS) AS SELECT * FROM processlist WITH CHECK OPTION;
 ERROR HY000: CHECK OPTION on non-updatable view 'test.v_processlist'
 CREATE VIEW test.v_processlist (ID, USER, HOST, DB, COMMAND, TIME, STATE, INFO, TIME_MS) AS SELECT * FROM processlist;
-UPDATE test.v_processlist SET TIME=NOW() WHERE id = 1;
-ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
 DROP VIEW test.v_processlist;
 UPDATE processlist SET user='any_user'  WHERE id=1 ;
 ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
@@ -120,8 +118,6 @@ DROP TABLE test.t_processlist;
 CREATE VIEW test.v_processlist (ID, USER, HOST, DB, COMMAND, TIME, STATE, INFO, TIME_MS) AS SELECT * FROM processlist WITH CHECK OPTION;
 ERROR HY000: CHECK OPTION on non-updatable view 'test.v_processlist'
 CREATE VIEW test.v_processlist (ID, USER, HOST, DB, COMMAND, TIME, STATE, INFO, TIME_MS) AS SELECT * FROM processlist;
-UPDATE test.v_processlist SET TIME=NOW() WHERE id = 1;
-ERROR 42000: Access denied for user 'ddicttestuser1'@'localhost' to database 'information_schema'
 DROP VIEW test.v_processlist;
 UPDATE processlist SET user='any_user'  WHERE id=1 ;
 ERROR 42000: Access denied for user 'ddicttestuser1'@'localhost' to database 'information_schema'
diff --git a/mysql-test/suite/funcs_1/views/views_master.inc b/mysql-test/suite/funcs_1/views/views_master.inc
index 4f8439efc3a..5ab8d52629c 100644
--- a/mysql-test/suite/funcs_1/views/views_master.inc
+++ b/mysql-test/suite/funcs_1/views/views_master.inc
@@ -3830,6 +3830,7 @@ while ($num)
    --error ER_NON_INSERTABLE_TABLE
    INSERT INTO v1 VALUES (1002);
    # --error ER_NON_UPDATABLE_TABLE, ER_UPDATE_TABLE_USED
+
    --error ER_NON_UPDATABLE_TABLE
    UPDATE v1 SET f61=1007;
    --error ER_NON_UPDATABLE_TABLE
diff --git a/mysql-test/suite/innodb/r/innodb_lock_wait_timeout_1.result b/mysql-test/suite/innodb/r/innodb_lock_wait_timeout_1.result
index bd8760b8f79..051266c526e 100644
--- a/mysql-test/suite/innodb/r/innodb_lock_wait_timeout_1.result
+++ b/mysql-test/suite/innodb/r/innodb_lock_wait_timeout_1.result
@@ -104,7 +104,7 @@ id	1
 select_type	PRIMARY
 table	<derived2>
 type	ALL
-possible_keys	NULL
+possible_keys	key0
 key	NULL
 key_len	NULL
 ref	NULL
@@ -308,7 +308,7 @@ id	1
 select_type	PRIMARY
 table	<derived2>
 type	ALL
-possible_keys	NULL
+possible_keys	key0
 key	NULL
 key_len	NULL
 ref	NULL
diff --git a/mysql-test/suite/innodb/r/innodb_mysql.result b/mysql-test/suite/innodb/r/innodb_mysql.result
index f072c76b775..9acc1f424d4 100644
--- a/mysql-test/suite/innodb/r/innodb_mysql.result
+++ b/mysql-test/suite/innodb/r/innodb_mysql.result
@@ -1739,8 +1739,8 @@ 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+2	DERIVED	t1	index_merge	c3,c2	c3,c2	5,10	NULL	1	Using intersect(c3,c2); Using where; Using filesort
 DROP TABLE t1;
 CREATE TABLE t1 (c1 REAL, c2 REAL, c3 REAL, KEY (c3), KEY (c2, c3))
 ENGINE=InnoDB;
@@ -1753,8 +1753,8 @@ 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+2	DERIVED	t1	index_merge	c3,c2	c3,c2	9,18	NULL	1	Using intersect(c3,c2); Using where; Using filesort
 DROP TABLE t1;
 CREATE TABLE t1 (c1 DECIMAL(12,2), c2 DECIMAL(12,2), c3 DECIMAL(12,2), 
 KEY (c3), KEY (c2, c3))
@@ -1768,8 +1768,8 @@ 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+2	DERIVED	t1	index_merge	c3,c2	c3,c2	7,14	NULL	1	Using intersect(c3,c2); Using where; Using filesort
 DROP TABLE t1;
 End of 5.1 tests
 drop table if exists t1, t2, t3;
@@ -2656,8 +2656,7 @@ SELECT COUNT(*) FROM
 (SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
 WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
 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	DERIVED	t1	index_merge	PRIMARY,idx	idx,PRIMARY	5,4	NULL	3537	Using sort_union(idx,PRIMARY); Using where
+1	SIMPLE	t1	index_merge	PRIMARY,idx	idx,PRIMARY	5,4	NULL	3537	Using sort_union(idx,PRIMARY); Using where
 SELECT COUNT(*) FROM
 (SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
 WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
diff --git a/mysql-test/suite/innodb_plugin/r/innodb_lock_wait_timeout_1.result b/mysql-test/suite/innodb_plugin/r/innodb_lock_wait_timeout_1.result
index bd8760b8f79..051266c526e 100644
--- a/mysql-test/suite/innodb_plugin/r/innodb_lock_wait_timeout_1.result
+++ b/mysql-test/suite/innodb_plugin/r/innodb_lock_wait_timeout_1.result
@@ -104,7 +104,7 @@ id	1
 select_type	PRIMARY
 table	<derived2>
 type	ALL
-possible_keys	NULL
+possible_keys	key0
 key	NULL
 key_len	NULL
 ref	NULL
@@ -308,7 +308,7 @@ id	1
 select_type	PRIMARY
 table	<derived2>
 type	ALL
-possible_keys	NULL
+possible_keys	key0
 key	NULL
 key_len	NULL
 ref	NULL
diff --git a/mysql-test/suite/innodb_plugin/r/innodb_mysql.result b/mysql-test/suite/innodb_plugin/r/innodb_mysql.result
index 1256268d030..df23048f834 100644
--- a/mysql-test/suite/innodb_plugin/r/innodb_mysql.result
+++ b/mysql-test/suite/innodb_plugin/r/innodb_mysql.result
@@ -1739,8 +1739,8 @@ 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+2	DERIVED	t1	index_merge	c3,c2	c3,c2	5,10	NULL	1	Using intersect(c3,c2); Using where; Using filesort
 DROP TABLE t1;
 CREATE TABLE t1 (c1 REAL, c2 REAL, c3 REAL, KEY (c3), KEY (c2, c3))
 ENGINE=InnoDB;
@@ -1753,8 +1753,8 @@ 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+2	DERIVED	t1	index_merge	c3,c2	c3,c2	9,18	NULL	1	Using intersect(c3,c2); Using where; Using filesort
 DROP TABLE t1;
 CREATE TABLE t1 (c1 DECIMAL(12,2), c2 DECIMAL(12,2), c3 DECIMAL(12,2), 
 KEY (c3), KEY (c2, c3))
@@ -1768,8 +1768,8 @@ 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+2	DERIVED	t1	index_merge	c3,c2	c3,c2	7,14	NULL	1	Using intersect(c3,c2); Using where; Using filesort
 DROP TABLE t1;
 End of 5.1 tests
 drop table if exists t1, t2, t3;
@@ -2440,8 +2440,7 @@ SELECT COUNT(*) FROM
 (SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
 WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
 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	DERIVED	t1	index_merge	PRIMARY,idx	idx,PRIMARY	5,4	NULL	3537	Using sort_union(idx,PRIMARY); Using where
+1	SIMPLE	t1	index_merge	PRIMARY,idx	idx,PRIMARY	5,4	NULL	3537	Using sort_union(idx,PRIMARY); Using where
 SELECT COUNT(*) FROM
 (SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
 WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
diff --git a/mysql-test/suite/parts/r/partition_repair_myisam.result b/mysql-test/suite/parts/r/partition_repair_myisam.result
index 4af00ddcc6d..a34627a91cb 100644
--- a/mysql-test/suite/parts/r/partition_repair_myisam.result
+++ b/mysql-test/suite/parts/r/partition_repair_myisam.result
@@ -393,6 +393,8 @@ partition	b	a	length(c)
 6	34	6 row 2	64
 6	83	 	64
 6	97	zzzzzZzzzzz	64
+SET @save_optimizer_switch= @@optimizer_switch;
+SET @@optimizer_switch='derived_merge=off';
 SELECT (b % 7) AS partition, b, a FROM (SELECT b,a FROM t1_will_crash) q
 WHERE (b % 7) = 6
 ORDER BY partition, b, a;
@@ -404,6 +406,7 @@ partition	b	a
 6	62	6 row 6
 6	83	 
 6	97	zzzzzZzzzzz
+SET @@optimizer_switch=@save_optimizer_switch;
 ALTER TABLE t1_will_crash CHECK PARTITION p6;
 Table	Op	Msg_type	Msg_text
 test.t1_will_crash	check	warning	Size of datafile is: 868       Should be: 604
diff --git a/mysql-test/suite/parts/t/partition_repair_myisam.test b/mysql-test/suite/parts/t/partition_repair_myisam.test
index a7ceb5b7faf..849f175b920 100644
--- a/mysql-test/suite/parts/t/partition_repair_myisam.test
+++ b/mysql-test/suite/parts/t/partition_repair_myisam.test
@@ -230,9 +230,12 @@ FLUSH TABLES;
 SELECT (b % 7) AS partition, b, a, length(c) FROM t1_will_crash
 WHERE (b % 7) = 6
 ORDER BY partition, b, a;
+SET @save_optimizer_switch= @@optimizer_switch;
+SET @@optimizer_switch='derived_merge=off';
 SELECT (b % 7) AS partition, b, a FROM (SELECT b,a FROM t1_will_crash) q
 WHERE (b % 7) = 6
 ORDER BY partition, b, a;
+SET @@optimizer_switch=@save_optimizer_switch;
 # NOTE: REBUILD PARTITION without CHECK before, 2 + (1) records will be lost!
 #ALTER TABLE t1_will_crash REBUILD PARTITION p6;
 ALTER TABLE t1_will_crash CHECK PARTITION p6;
diff --git a/mysql-test/suite/pbxt/r/derived.result b/mysql-test/suite/pbxt/r/derived.result
index 56d2f8ac929..b4c1762e81a 100644
--- a/mysql-test/suite/pbxt/r/derived.result
+++ b/mysql-test/suite/pbxt/r/derived.result
@@ -57,9 +57,8 @@ a	b	a	b
 3	c	3	c
 explain select * from t1 as x1, (select * from t1) as x2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	x1	ALL	NULL	NULL	NULL	NULL	4	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	Using join buffer (flat, BNL join)
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	
+1	SIMPLE	x1	ALL	NULL	NULL	NULL	NULL	4	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using join buffer (flat, BNL join)
 drop table if exists  t2,t3;
 select * from (select 1) as a;
 1
@@ -91,7 +90,7 @@ a	b
 2	b
 explain select * from (select * from t1 union select * from t1) a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	8	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	
 3	UNION	t1	ALL	NULL	NULL	NULL	NULL	4	
 NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -113,9 +112,8 @@ a	b
 3	c
 explain select * from (select t1.*, t2.a as t2a from t1,t2 where t1.a=t2.a) t1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using where; Using join buffer (flat, BNL join)
 drop table t1, t2;
 create table t1(a int not null, t char(8), index(a));
 SELECT * FROM (SELECT * FROM t1) as b ORDER BY a  ASC LIMIT 0,20;
@@ -142,9 +140,8 @@ a	t
 20	20
 explain select count(*) from t1 as tt1, (select * from t1) as tt2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	tt1	index	NULL	a	4	NULL	10000	Using index
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	10000	Using join buffer (flat, BNL join)
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	10000	
+1	SIMPLE	tt1	index	NULL	a	4	NULL	10000	Using index
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	10000	Using join buffer (flat, BNL join)
 drop table t1;
 SELECT * FROM (SELECT (SELECT * FROM (SELECT 1 as a) as a )) as b;
 (SELECT * FROM (SELECT 1 as a) as a )
@@ -173,30 +170,30 @@ insert into t1 values (NULL, 'a', 1), (NULL, 'b', 2), (NULL, 'c', 3), (NULL, 'd'
 insert into t2 values (1, 100), (1, 101), (1, 102), (2, 100), (2, 103), (2, 104), (3, 101), (3, 102), (3, 105);
 SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 pla_id	mat_id
-100	1
-101	1
 102	1
-103	2
+101	1
+100	1
 104	2
+103	2
 105	3
 SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2  INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 pla_id	test
-100	1
-101	1
 102	1
-103	2
+101	1
+100	1
 104	2
+103	2
 105	3
 explain SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
+1	PRIMARY	<derived2>	ref	key0	key0	7	test.m2.matintnum	2	
 2	DERIVED	mp	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 2	DERIVED	m1	eq_ref	PRIMARY	PRIMARY	3	test.mp.mat_id	1	
 explain SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2  INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	m2	ALL	NULL	NULL	NULL	NULL	9	
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	Using where; Using join buffer (flat, BNL join)
+1	PRIMARY	<derived2>	ref	key0	key0	7	test.m2.matintnum	2	
 2	DERIVED	mp	ALL	NULL	NULL	NULL	NULL	9	Using temporary; Using filesort
 2	DERIVED	m1	eq_ref	PRIMARY	PRIMARY	3	test.mp.mat_id	1	
 drop table t1,t2;
@@ -234,9 +231,8 @@ count(*)
 2
 explain select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	THEMAX.E2	1	Using where
-2	DERIVED	A	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	A	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.A.E2	1	Using where
 3	DEPENDENT SUBQUERY	B	ALL	NULL	NULL	NULL	NULL	2	Using where
 drop table t1;
 create table t1 (a int);
@@ -249,8 +245,8 @@ a	a
 2	2
 explain select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
-1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (flat, BNL join)
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	
+1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	4	Using join buffer (flat, BNL join)
 4	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	
 5	UNION	t1	ALL	NULL	NULL	NULL	NULL	2	
 NULL	UNION RESULT	<union4,5>	ALL	NULL	NULL	NULL	NULL	NULL	
@@ -315,7 +311,7 @@ a	7.0000
 b	3.5000
 explain SELECT s.name, AVG(s.val) AS median FROM (SELECT x.name, x.val FROM t1 x, t1 y WHERE x.name=y.name GROUP BY x.name, x.val HAVING SUM(y.val <= x.val) >= COUNT(*)/2 AND SUM(y.val >= x.val) >= COUNT(*)/2) AS s GROUP BY s.name;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	Using temporary; Using filesort
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	289	Using temporary; Using filesort
 2	DERIVED	x	ALL	NULL	NULL	NULL	NULL	17	Using temporary; Using filesort
 2	DERIVED	y	ALL	NULL	NULL	NULL	NULL	17	Using where; Using join buffer (flat, BNL join)
 drop table t1;
@@ -326,8 +322,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	index	PRIMARY	PRIMARY	4	NULL	2	Using where; Using index
 explain select a from (select a from t2 where a>1) tt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t2	index	PRIMARY	PRIMARY	4	NULL	2	Using where; Using index
+1	SIMPLE	t2	index	PRIMARY	PRIMARY	4	NULL	2	Using where; Using index
 drop table t2;
 CREATE TABLE `t1` ( `itemid` int(11) NOT NULL default '0', `grpid` varchar(15) NOT NULL default '', `vendor` int(11) NOT NULL default '0', `date_` date NOT NULL default '0000-00-00', `price` decimal(12,2) NOT NULL default '0.00', PRIMARY KEY  (`itemid`,`grpid`,`vendor`,`date_`), KEY `itemid` (`itemid`,`vendor`), KEY `itemid_2` (`itemid`,`date_`));
 insert into t1 values (128, 'rozn', 2, now(), 10),(128, 'rozn', 1, now(), 10);
diff --git a/mysql-test/suite/pbxt/r/subselect.result b/mysql-test/suite/pbxt/r/subselect.result
index 21316f38f24..e183cf389c0 100644
--- a/mysql-test/suite/pbxt/r/subselect.result
+++ b/mysql-test/suite/pbxt/r/subselect.result
@@ -199,11 +199,10 @@ select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
 explain extended select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from 
 (select * from t2 where a>1) as tt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	<derived3>	system	NULL	NULL	NULL	NULL	1	100.00	
-3	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
+1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
 2	SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using filesort
 Warnings:
-Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,2 AS `a` from (select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` where (`test`.`t2`.`a` > 1)) `tt`
+Note	1003	select (select `test`.`t3`.`a` from `test`.`t3` where (`test`.`t3`.`a` < 8) order by 1 desc limit 1) AS `(select t3.a from t3 where a<8 order by 1 desc limit 1)`,`test`.`t2`.`a` AS `a` from `test`.`t2` where (`test`.`t2`.`a` > 1)
 select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
 a
 2
@@ -363,9 +362,9 @@ INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
 EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
-4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	100.00	Using index
+4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
 2	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	
-3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	100.00	Using index
+3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	100.00	Using index
 Warnings:
 Note	1003	select 'joce' AS `pseudo`,(select 'test' from `test`.`t8` where ('joce' = (select 'joce' from `test`.`t8` where 1))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where ('joce' = (select 'joce' from `test`.`t8` where 1))
 SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
diff --git a/mysql-test/suite/pbxt/r/view_grant.result b/mysql-test/suite/pbxt/r/view_grant.result
index f66ff458761..23484398203 100644
--- a/mysql-test/suite/pbxt/r/view_grant.result
+++ b/mysql-test/suite/pbxt/r/view_grant.result
@@ -110,7 +110,7 @@ show create view mysqltest.v1;
 ERROR 42000: SHOW VIEW command denied to user 'mysqltest_1'@'localhost' for table 'v1'
 explain select c from mysqltest.v2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	0	
 show create view mysqltest.v2;
 ERROR 42000: SHOW VIEW command denied to user 'mysqltest_1'@'localhost' for table 'v2'
@@ -131,7 +131,7 @@ View	Create View	character_set_client	collation_connection
 v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `mysqltest`.`v1` AS select (`mysqltest`.`t1`.`a` + 1) AS `c`,(`mysqltest`.`t1`.`b` + 1) AS `d` from `mysqltest`.`t1`	latin1	latin1_swedish_ci
 explain select c from mysqltest.v2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	0	
 show create view mysqltest.v2;
 View	Create View	character_set_client	collation_connection
@@ -144,7 +144,7 @@ View	Create View	character_set_client	collation_connection
 v3	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `mysqltest`.`v3` AS select (`mysqltest`.`t2`.`a` + 1) AS `c`,(`mysqltest`.`t2`.`b` + 1) AS `d` from `mysqltest`.`t2`	latin1	latin1_swedish_ci
 explain select c from mysqltest.v4;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
 2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	0	
 show create view mysqltest.v4;
 View	Create View	character_set_client	collation_connection
diff --git a/mysql-test/suite/vcol/r/vcol_select_innodb.result b/mysql-test/suite/vcol/r/vcol_select_innodb.result
index a54a2f828b5..129022dd7cc 100644
--- a/mysql-test/suite/vcol/r/vcol_select_innodb.result
+++ b/mysql-test/suite/vcol/r/vcol_select_innodb.result
@@ -98,8 +98,7 @@ a	b	c
 NULL	NULL	NULL
 explain select * from (select a,b,c from t1) as t11;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	5	
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
 ###
 ### Using aggregate functions with/without DISTINCT
 ###
diff --git a/mysql-test/suite/vcol/r/vcol_select_myisam.result b/mysql-test/suite/vcol/r/vcol_select_myisam.result
index fa25a00f929..43ec4e90e88 100644
--- a/mysql-test/suite/vcol/r/vcol_select_myisam.result
+++ b/mysql-test/suite/vcol/r/vcol_select_myisam.result
@@ -98,8 +98,7 @@ a	b	c
 NULL	NULL	NULL
 explain select * from (select a,b,c from t1) as t11;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	5	
-2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
 ###
 ### Using aggregate functions with/without DISTINCT
 ###
diff --git a/mysql-test/suite/vcol/r/vcol_view_innodb.result b/mysql-test/suite/vcol/r/vcol_view_innodb.result
index 6db6f7414b1..88681ca305f 100644
--- a/mysql-test/suite/vcol/r/vcol_view_innodb.result
+++ b/mysql-test/suite/vcol/r/vcol_view_innodb.result
@@ -63,7 +63,7 @@ b
 -3
 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	3	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
 select * from t1;
 a	b	c
@@ -82,7 +82,7 @@ c
 -3
 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	3	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
 select * from t1;
 a	b	c
@@ -107,7 +107,7 @@ MariaDB-5.3: the following EXPLAIN produces incorrect #rows for table t1.
 MariaDB-5.3: this is expected to go away when FROM subquery optimizations are pushed
 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using filesort
 drop view v1;
 create view v1 as select c+1 from t1 order by 1 desc limit 2;
@@ -119,7 +119,7 @@ MariaDB-5.3: the following EXPLAIN produces incorrect #rows for table t1.
 MariaDB-5.3: this is expected to go away when FROM subquery optimizations are pushed
 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using filesort
 drop view v1;
 drop table t1;
diff --git a/mysql-test/suite/vcol/r/vcol_view_myisam.result b/mysql-test/suite/vcol/r/vcol_view_myisam.result
index dedb62a00fb..72e0bdb16a4 100644
--- a/mysql-test/suite/vcol/r/vcol_view_myisam.result
+++ b/mysql-test/suite/vcol/r/vcol_view_myisam.result
@@ -63,7 +63,7 @@ b
 -3
 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	3	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
 select * from t1;
 a	b	c
@@ -82,7 +82,7 @@ c
 -3
 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	3	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	6	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary
 select * from t1;
 a	b	c
@@ -107,7 +107,7 @@ MariaDB-5.3: the following EXPLAIN produces incorrect #rows for table t1.
 MariaDB-5.3: this is expected to go away when FROM subquery optimizations are pushed
 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using filesort
 drop view v1;
 create view v1 as select c+1 from t1 order by 1 desc limit 2;
@@ -119,7 +119,7 @@ MariaDB-5.3: the following EXPLAIN produces incorrect #rows for table t1.
 MariaDB-5.3: this is expected to go away when FROM subquery optimizations are pushed
 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	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	
 2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	Using filesort
 drop view v1;
 drop table t1;
diff --git a/mysql-test/t/derived.test b/mysql-test/t/derived.test
index 962cec95add..75368925499 100644
--- a/mysql-test/t/derived.test
+++ b/mysql-test/t/derived.test
@@ -315,3 +315,19 @@ WHERE j = SUBSTRING('12', (SELECT * FROM (SELECT MIN(j) FROM t1) t2))) t3;
 DROP TABLE t1;
 
 --echo # End of 5.0 tests
+
+--echo #
+--echo #  LP bug #793436: query with a derived table for which optimizer proves
+--echo #                  that it contains not more than 1 row
+--echo #
+
+CREATE TABLE t1 (a int, KEY (a)) ;
+INSERT INTO t1 VALUES (3), (1);
+CREATE TABLE t2 (a int);
+INSERT INTO t2 VALUES (3);
+
+EXPLAIN
+SELECT * FROM (SELECT DISTINCT * FROM t2) t, t1  WHERE t1.a = t.a;
+SELECT * FROM (SELECT DISTINCT * FROM t2) t, t1  WHERE t1.a = t.a;
+
+DROP TABLE t1,t2;
diff --git a/mysql-test/t/derived_view.test b/mysql-test/t/derived_view.test
new file mode 100644
index 00000000000..93c2eb48fcd
--- /dev/null
+++ b/mysql-test/t/derived_view.test
@@ -0,0 +1,237 @@
+--disable_warnings
+drop table if exists t1,t2;
+drop view if exists v1,v2,v3,v4;
+--enable_warnings
+create table t1(f1 int, f11 int);
+create table t2(f2 int, f22 int);
+insert into t1 values(1,1),(2,2),(3,3),(5,5),(9,9),(7,7);
+insert into t1 values(17,17),(13,13),(11,11),(15,15),(19,19);
+insert into t2 values(1,1),(3,3),(2,2),(4,4),(8,8),(6,6);
+insert into t2 values(12,12),(14,14),(10,10),(18,18),(16,16);
+
+--echo Tests:
+
+--echo for merged derived tables
+--echo  explain for simple derived
+explain select * from (select * from t1) tt;
+select * from (select * from t1) tt;
+--echo  explain for multitable derived
+explain extended select * from (select * from t1 join t2 on f1=f2) tt;
+select * from (select * from t1 join t2 on f1=f2) tt;
+--echo  explain for derived with where
+explain extended 
+  select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
+select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
+--echo join of derived
+explain extended 
+  select * from (select * from t1 where f1 in (2,3)) tt join
+  (select * from t1 where f1 in (1,2)) aa on tt.f1=aa.f1;
+select * from (select * from t1 where f1 in (2,3)) tt join
+  (select * from t1 where f1 in (1,2)) aa on tt.f1=aa.f1;
+
+flush status;
+explain extended 
+  select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
+show status like 'Handler_read%';
+flush status;
+select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
+show status like 'Handler_read%';
+
+--echo for merged views
+create view v1 as select * from t1;
+create view v2 as select * from t1 join t2 on f1=f2;
+create view v3 as select * from t1 where f1 in (2,3);
+create view v4 as select * from t2 where f2 in (2,3);
+--echo  explain for simple views
+explain extended select * from v1;
+select * from v1;
+--echo  explain for multitable views
+explain extended select * from v2;
+select * from v2;
+--echo  explain for views with where
+explain extended select * from v3 where f11 in (1,3);
+select * from v3 where f11 in (1,3);
+--echo explain for joined views
+explain extended
+  select * from v3 join v4 on f1=f2;
+select * from v3 join v4 on f1=f2;
+
+flush status;
+explain extended select * from v4 where f2 in (1,3);
+show status like 'Handler_read%';
+flush status;
+select * from v4 where f2 in (1,3);
+show status like 'Handler_read%';
+
+--echo for materialized derived tables
+--echo  explain for simple derived
+explain extended select * from (select * from t1 group by f1) tt;
+select * from (select * from t1 having f1=f1) tt;
+--echo  explain showing created indexes
+explain extended 
+  select * from t1 join (select * from t2 group by f2) tt on f1=f2;
+select * from t1 join (select * from t2 group by f2) tt on f1=f2;
+--echo  explain showing late materialization
+flush status;
+explain select * from t1 join (select * from t2 group by f2) tt on f1=f2;
+show status like 'Handler_read%';
+flush status;
+select * from t1 join (select * from t2 group by f2) tt on f1=f2;
+show status like 'Handler_read%';
+
+--echo for materialized views
+drop view v1,v2,v3;
+create view v1 as select * from t1 group by f1;
+create view v2 as select * from t2 group by f2;
+create view v3 as select t1.f1,t1.f11 from t1 join t1 as t11 where t1.f1=t11.f1
+                    having t1.f1<100;
+--echo  explain for simple derived
+explain extended select * from v1;
+select * from v1;
+--echo  explain showing created indexes
+explain extended select * from t1 join v2 on f1=f2;
+select * from t1 join v2 on f1=f2;
+explain extended
+  select * from t1,v3 as v31,v3 where t1.f1=v31.f1 and t1.f1=v3.f1;
+flush status;
+select * from t1,v3 as v31,v3 where t1.f1=v31.f1 and t1.f1=v3.f1;
+show status like 'Handler_read%';
+--echo  explain showing late materialization
+flush status;
+explain select * from t1 join v2 on f1=f2;
+show status like 'Handler_read%';
+flush status;
+select * from t1 join v2 on f1=f2;
+show status like 'Handler_read%';
+
+explain extended select * from v1 join v4 on f1=f2;
+select * from v1 join v4 on f1=f2;
+
+--echo merged derived in merged derived
+explain extended select * from (select * from 
+  (select * from t1 where f1 < 7) tt where f1 > 2) zz;
+select * from (select * from 
+  (select * from t1 where f1 < 7) tt where f1 > 2) zz;
+
+--echo materialized derived in merged derived
+explain extended  select * from (select * from 
+  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) zz;
+select * from (select * from 
+  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) zz;
+
+--echo merged derived in materialized derived
+explain  extended select * from (select * from 
+  (select * from t1 where f1 < 7) tt where f1 > 2 group by f1) zz;
+select * from (select * from 
+  (select * from t1 where f1 < 7) tt where f1 > 2 group by f1) zz;
+
+--echo materialized derived in materialized derived
+explain extended  select * from (select * from 
+  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
+select * from (select * from 
+  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
+
+--echo mat in merged derived join mat in merged derived
+explain extended  select * from 
+ (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
+join 
+ (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z
+ on x.f1 = z.f1;
+
+flush status;
+select * from 
+ (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
+join 
+ (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z
+ on x.f1 = z.f1;
+show status like 'Handler_read%';
+flush status;
+
+--echo merged in merged derived join merged in merged derived
+explain extended  select * from 
+ (select * from 
+  (select * from t1 where f1 < 7 ) tt where f1 > 2 ) x
+join 
+ (select * from 
+  (select * from t1 where f1 < 7 ) tt where f1 > 2 ) z
+ on x.f1 = z.f1;
+
+select * from 
+ (select * from 
+  (select * from t1 where f1 < 7 ) tt where f1 > 2 ) x
+join 
+ (select * from 
+  (select * from t1 where f1 < 7 ) tt where f1 > 2 ) z
+ on x.f1 = z.f1;
+
+--echo materialized in materialized derived join 
+--echo   materialized in materialized derived
+explain extended  select * from 
+ (select * from 
+  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) x
+join 
+ (select * from 
+  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) z
+ on x.f1 = z.f1;
+
+select * from 
+ (select * from 
+  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) x
+join 
+ (select * from 
+  (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) z
+ on x.f1 = z.f1;
+
+--echo merged view in materialized derived
+explain extended
+select * from (select * from v4 group by 1) tt;
+select * from (select * from v4 group by 1) tt;
+
+--echo materialized view in merged derived
+explain extended 
+select * from ( select * from v1 where f1 < 7) tt;
+select * from ( select * from v1 where f1 < 7) tt;
+
+--echo merged view in a merged view in a merged derived
+create view v6 as select * from v4 where f2 < 7;
+explain extended select * from (select * from v6) tt;
+select * from (select * from v6) tt;
+
+--echo materialized view in a merged view in a materialized derived
+create view v7 as select * from v1;
+explain extended select * from (select * from v7 group by 1) tt;
+select * from (select * from v7 group by 1) tt;
+
+--echo join of above two
+explain extended select * from v6 join v7 on f2=f1;
+select * from v6 join v7 on f2=f1;
+
+--echo test two keys
+explain select * from t1 join (select * from t2 group by f2) tt on t1.f1=tt.f2 join t1 xx on tt.f22=xx.f1;
+select * from t1 join (select * from t2 group by f2) tt on t1.f1=tt.f2 join t1 xx on tt.f22=xx.f1;
+
+
+--echo TODO: Add test with 64 tables mergeable view to test fall back to
+--echo materialization on tables > MAX_TABLES merge
+drop table t1,t2;
+drop view v1,v2,v3,v4,v6,v7;
+
+--echo #
+--echo #  LP bug #794909: crash when defining possible keys for
+--echo #                  a materialized view/derived_table
+--echo #
+
+CREATE TABLE t1 (f1 int) ;
+INSERT INTO t1 VALUES (149), (150), (224), (29);
+
+CREATE TABLE t2 (f1 int, KEY (f1));
+INSERT INTO t2 VALUES (149), (NULL), (224);
+
+CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
+
+EXPLAIN
+SELECT * FROM v1 JOIN t2 ON v1.f1 = t2.f1;
+SELECT * FROM v1 JOIN t2 ON v1.f1 = t2.f1;
+
+DROP VIEW v1;
+DROP TABLE t1,t2;
diff --git a/mysql-test/t/lock_multi_bug38499.test b/mysql-test/t/lock_multi_bug38499.test
index 3d3f084ba5f..b812984e516 100644
--- a/mysql-test/t/lock_multi_bug38499.test
+++ b/mysql-test/t/lock_multi_bug38499.test
@@ -16,7 +16,9 @@ connect (writer,localhost,root,,);
 DROP TABLE IF EXISTS t1;
 --enable_warnings
 CREATE TABLE t1( a INT, b INT );
+CREATE TABLE t2( a INT, b INT );
 INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4);
+INSERT INTO t2 VALUES (1, 1), (2, 2), (3, 3), (4, 4);
 
 --echo # 1. test regular tables
 --echo # 1.1. test altering of columns that multiupdate doesn't use
@@ -28,7 +30,7 @@ while ($i) {
 --dec $i
 
 --connection writer
-  send UPDATE t1, (SELECT 1 FROM t1 t1i) d SET a = 0 WHERE 1=0;
+  send UPDATE t1, (SELECT 1 FROM t2 t1i) d SET a = 0 WHERE 1=0;
 
 --connection locker
   ALTER TABLE t1 ADD COLUMN (c INT);
@@ -41,7 +43,7 @@ while ($i) {
 --echo # 1.1.2. PS mode
 
 --connection writer
-PREPARE stmt FROM 'UPDATE t1, (SELECT 1 FROM t1 t1i) d SET a = 0 WHERE 1=0';
+PREPARE stmt FROM 'UPDATE t1, (SELECT 1 FROM t2 t1i) d SET a = 0 WHERE 1=0';
 
 let $i = 100;
 while ($i) {
@@ -75,7 +77,7 @@ while ($i) {
   UPDATE t1 SET a=b;
 
 --connection writer
---send UPDATE t1, (SELECT 1 FROM t1 t1i) d SET a = 0 WHERE 1=0;
+--send UPDATE t1, (SELECT 1 FROM t2 t1i) d SET a = 0 WHERE 1=0;
 
 --connection locker
 --error 0,ER_CANT_DROP_FIELD_OR_KEY
@@ -100,7 +102,7 @@ while ($i) {
   UPDATE t1 SET a=b;
 
 --connection writer
-  PREPARE stmt FROM 'UPDATE t1, (SELECT 1 FROM t1 t1i) d SET a = 0 WHERE 1=0';
+  PREPARE stmt FROM 'UPDATE t1, (SELECT 1 FROM t2 t1i) d SET a = 0 WHERE 1=0';
 --send EXECUTE stmt
 
 --connection locker
@@ -210,7 +212,7 @@ while ($i) {
 }
 --enable_query_log
 --connection default
-DROP TABLE t1;
+DROP TABLE t1,t2;
 
 
 # Close connections
diff --git a/mysql-test/t/multi_update.test b/mysql-test/t/multi_update.test
index 6a5736913b4..58a614e3a11 100644
--- a/mysql-test/t/multi_update.test
+++ b/mysql-test/t/multi_update.test
@@ -685,6 +685,9 @@ CREATE FUNCTION f1 () RETURNS BLOB RETURN 1;
 CREATE TABLE t1 (f1 DATE);
 INSERT INTO t1 VALUES('2001-01-01');
 UPDATE (SELECT 1 FROM t1 WHERE f1 = (SELECT f1() FROM t1)) x, t1 SET f1 = 1;
+CREATE view v1 as SELECT f1() FROM t1;
+UPDATE (SELECT 1 FROM t1 WHERE f1 = (select * from v1)) x, t1 SET f1 = 1;
+DROP VIEW v1;
 DROP FUNCTION f1;
 DROP TABLE t1;
 
diff --git a/mysql-test/t/subselect_mat.test b/mysql-test/t/subselect_mat.test
index 4a300561d58..9d6eb2775ab 100644
--- a/mysql-test/t/subselect_mat.test
+++ b/mysql-test/t/subselect_mat.test
@@ -74,8 +74,8 @@ SELECT i FROM t1 LEFT JOIN t2 ON (j) IN (SELECT max(k) FROM t3);
 DROP TABLE t1, t2, t3;
 
 --echo #
---echo # LPBUG#609121: RQG: wrong result on aggregate + NOT IN + HAVING and
---echo # partial_match_table_scan=on
+--echo # LPBUG#611622/BUG#52344: Subquery materialization:  Assertion 
+--echo #                         if subquery in on-clause of outer join
 --echo #
 
 CREATE TABLE t1 (c1 int);
@@ -86,7 +86,7 @@ INSERT INTO t2 VALUES (10);
 
 PREPARE st1 FROM "
 SELECT *
-FROM t2 LEFT JOIN (SELECT * FROM t2) t3 ON (8, 4) IN (SELECT c1, c1 FROM t1)";
+FROM t2 LEFT JOIN t2 t3 ON (8, 4) IN (SELECT c1, c1 FROM t1)";
 
 EXECUTE st1;
 EXECUTE st1;
diff --git a/mysql-test/t/view.test b/mysql-test/t/view.test
index 2d98db07e02..626cc506e78 100644
--- a/mysql-test/t/view.test
+++ b/mysql-test/t/view.test
@@ -2782,6 +2782,7 @@ DROP VIEW IF EXISTS v1;
 #
 # Bug#21261 Wrong access rights was required for an insert to a view
 #
+
 CREATE DATABASE bug21261DB;
 USE bug21261DB;
 connect (root,localhost,root,,bug21261DB);
@@ -4113,3 +4114,23 @@ SELECT * FROM t1,v2
 
 DROP VIEW v2;
 DROP TABLE t1,t2;
+
+--echo #
+--echo # Bug#794038: crash  with INSERT/UPDATE/DELETE 
+--echo #             over a non-updatable view
+--echo #
+
+CREATE TABLE t1 (a int);
+CREATE ALGORITHM = TEMPTABLE VIEW v1 AS SELECT * FROM t1;
+CREATE ALGORITHM = MERGE VIEW v2 AS SELECT * FROM v1;
+CREATE ALGORITHM = TEMPTABLE VIEW v3 AS SELECT * FROM v2;
+
+-- error ER_NON_INSERTABLE_TABLE
+INSERT INTO v3 VALUES (1);
+-- error ER_NON_UPDATABLE_TABLE
+UPDATE v3 SET a=0;
+-- error ER_NON_UPDATABLE_TABLE
+DELETE FROM v3;
+
+DROP VIEW v1,v2,v3;
+DROP TABLE t1;