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mariadb/mysql-test/r/derived_view.result
Igor Babaev ab411f8f1c Fixed LP bug #794909. 
The function generate_derived_keys did not take into account the fact
that the last element in the array of keyuses could be just a barrier
element. In some cases it could lead to a crash of the server.

Also fixed a couple of other bugs in generate_derived_keys: the inner 
loop in the body of if this function did not change the cycle variables
properly.
2011-06-09 12:43:28 -07:00

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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;
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