mariadb/mysql-test/r/derived_view.result

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;
#
#  LP bug #802023: MIN/MAX optimization 
#                  for mergeable derived tables and views
#
CREATE TABLE t1 (a int, b int, c varchar(32), INDEX idx(a,b));
INSERT INTO t1 VALUES 
(7, 74, 'yyyyyyy'), (9, 97, 'aaaaaaaaa'), (2, 23, 'tt'),
(5, 55, 'ddddd'), (2, 27, 'ss'), (7, 76, 'xxxxxxx'),
(7, 79, 'zzzzzzz'), (9, 92, 'bbbbbbbbb'), (2, 25, 'pp'),
(5, 53, 'eeeee'), (2, 23, 'qq'), (7, 76,'wwwwwww'),
(7, 74, 'uuuuuuu'), (9, 92, 'ccccccccc'), (2, 25, 'oo');
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT MIN(a) FROM t1 WHERE a >= 5;
MIN(a)
5
EXPLAIN
SELECT MIN(a) FROM t1 WHERE a >= 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
SELECT MIN(a) FROM (SELECT * FROM t1) t WHERE a >= 5;
MIN(a)
5
EXPLAIN
SELECT MIN(a) FROM(SELECT * FROM t1) t WHERE a >= 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
SELECT MIN(a) FROM v1 WHERE a >= 5;
MIN(a)
5
EXPLAIN
SELECT MIN(a) FROM v1 WHERE a >= 5;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
SELECT MAX(b) FROM t1 WHERE a=7 AND b<75;
MAX(b)
74
EXPLAIN
SELECT MAX(b) FROM t1 WHERE a=7 AND b<75;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
SELECT MAX(b) FROM (SELECT * FROM t1) t WHERE a=7 AND b<75;
MAX(b)
74
EXPLAIN
SELECT MAX(b) FROM (SELECT * FROM t1) t WHERE a=7 AND b<75;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
SELECT MAX(b) FROM v1 WHERE a=7 AND b<75;
MAX(b)
74
EXPLAIN
SELECT MAX(b) FROM v1 WHERE a=7 AND b<75;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
DROP VIEW v1;
DROP TABLE t1;