set @exit_optimizer_switch=@@optimizer_switch; set @exit_join_cache_level=@@join_cache_level; set @exit_join_buffer_size=@@join_buffer_size; set optimizer_switch='derived_merge=on,derived_with_keys=on'; set @save_optimizer_switch=@@optimizer_switch; set join_cache_level=1;
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 11 22 33 55 99 77 1717 1313 1111 1515 1919
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 11100.00 1 SIMPLE t2 ALL NULL NULL NULL NULL 11100.00 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 1111 3333 2222
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 11100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where `test`.`t1`.`f11` = 2and `test`.`t1`.`f1` in (2,3)
select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
f1 f11 22
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 11100.00 Using where 1 SIMPLE t1 ALL NULL NULL NULL NULL 11100.00 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 2222
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 11100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where `test`.`t1`.`f11` = 2and `test`.`t1`.`f1` in (2,3)
show status like 'Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 0
flush status;
select * from (select * from t1 where f1 in (2,3)) tt where f11=2;
f1 f11 22
show status like 'Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 0
Handler_read_rnd_deleted 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 11100.00
Warnings:
Note 1003 select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1`
select * from v1;
f1 f11 11 22 33 55 99 77 1717 1313 1111 1515 1919
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 11100.00 1 SIMPLE t2 ALL NULL NULL NULL NULL 11100.00 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 1111 3333 2222
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 11100.00 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 33
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 11100.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 11100.00 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 3333 2222
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 11100.00 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_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 0
flush status;
select * from v4 where f2 in (1,3);
f2 f22 33
show status like 'Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 0
Handler_read_rnd_deleted 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 11100.00 2 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#2 */ 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 11 22 33 55 99 77 1717 1313 1111 1515 1919
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 11100.00 Using where 1 PRIMARY <derived2> ref key0 key0 5 test.t1.f1 1100.00 2 DERIVED t2 ALL NULL NULL NULL NULL 11100.00 Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11`,`tt`.`f2` AS `f2`,`tt`.`f22` AS `f22` from `test`.`t1` join (/* select#2 */ 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 1111 2222 3333
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 1 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_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 0
Handler_read_rnd_deleted 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 1111 2222 3333
show status like 'Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 11
Handler_read_last 0
Handler_read_next 3
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 11
Handler_read_rnd_deleted 0
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 11100.00 2 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1`
select * from v1;
f1 f11 11 22 33 55 77 99 1111 1313 1515 1717 1919
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 11100.00 Using where 1 PRIMARY <derived2> ref key0 key0 5 test.t1.f1 1100.00 2 DERIVED t2 ALL NULL NULL NULL NULL 11100.00 Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ 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 1111 2222 3333
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 11100.00 Using where 1 PRIMARY <derived2> ref key0 key0 5 test.t1.f1 10100.00 1 PRIMARY <derived3> ref key0 key0 5 test.t1.f1 10100.00 3 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 3 DERIVED t11 ALL NULL NULL NULL NULL 11100.00 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 2 DERIVED t11 ALL NULL NULL NULL NULL 11100.00 Using where; Using join buffer (flat, BNL join)
Warnings:
Note 1003/* select#1 */ 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 111111 222222 333333 555555 999999 777777 171717171717 131313131313 111111111111 151515151515 191919191919
show status like 'Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 22
Handler_read_last 0
Handler_read_next 22
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 0
Handler_read_rnd_deleted 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 1 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_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 0
flush status;
select * from t1 join v2 on f1=f2;
f1 f11 f2 f22 1111 2222 3333
show status like 'Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 11
Handler_read_last 0
Handler_read_next 3
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 11
Handler_read_rnd_deleted 0
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 11100.00 Using where 1 PRIMARY <derived2> ref key0 key0 5 test.t2.f2 1100.00 2 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ 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)
explain format=json select * from v1 join v4 on f1=f2;
EXPLAIN
{ "query_block": { "select_id": 1, "cost": "COST_REPLACED", "nested_loop": [
{ "table": { "table_name": "t2", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t2.f2 in (2,3) and t2.f2 is not null"
}
},
{ "table": { "table_name": "<derived2>", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["f1"], "ref": ["test.t2.f2"], "loops": 11, "rows": 1, "cost": "COST_REPLACED", "filtered": 100, "materialized": { "query_block": { "select_id": 2, "cost": "COST_REPLACED", "filesort": { "sort_key": "t1.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "t1", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t1.f1 in (2,3)"
}
}
]
}
}
}
}
}
}
]
}
}
select * from v1 join v4 on f1=f2;
f1 f11 f2 f22 3333 2222
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 11100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where `test`.`t1`.`f1` > 2and `test`.`t1`.`f1` < 7
select * from (select * from
(select * from t1 where f1 < 7) tt where f1 > 2) zz;
f1 f11 33 55
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 PRIMARY <derived3> ALL NULL NULL NULL NULL 11100.00 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where `test`.`t1`.`f1` < 7 and `test`.`t1`.`f1` > 2 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 33 55
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 11100.00 2 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `zz`.`f1` AS `f1`,`zz`.`f11` AS `f11` from (/* select#2 */ 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 33 55
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 11100.00 2 DERIVED <derived3> ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `zz`.`f1` AS `f1`,`zz`.`f11` AS `f11` from (/* select#2 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where `test`.`t1`.`f1` < 7 and `test`.`t1`.`f1` > 2 group by `test`.`t1`.`f1`) `tt` where `tt`.`f1` > 2 group by `tt`.`f1`) `zz`
explain format=json select * from (select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
EXPLAIN
{ "query_block": { "select_id": 1, "cost": "COST_REPLACED", "nested_loop": [
{ "table": { "table_name": "<derived2>", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "materialized": { "query_block": { "select_id": 2, "cost": "COST_REPLACED", "filesort": { "sort_key": "tt.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "<derived3>", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "tt.f1 > 2", "materialized": { "query_block": { "select_id": 3, "cost": "COST_REPLACED", "filesort": { "sort_key": "t1.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "t1", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t1.f1 < 7 and t1.f1 > 2"
}
}
]
}
}
}
}
}
}
]
}
}
}
}
}
}
]
}
}
select * from (select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
f1 f11 33 55
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 PRIMARY <derived3> ALL NULL NULL NULL NULL 11100.00 Using where 1 PRIMARY <derived5> ref key0 key0 5 tt.f1 1100.00 5 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11`,`tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where `test`.`t1`.`f1` < 7 and `test`.`t1`.`f1` > 2 and `test`.`t1`.`f1` > 2 group by `test`.`t1`.`f1`) `tt` join (/* select#5 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where `test`.`t1`.`f1` < 7 and `test`.`t1`.`f1` > 2 and `test`.`t1`.`f1` > 2 group by `test`.`t1`.`f1`) `tt` where `tt`.`f1` = `tt`.`f1` and `tt`.`f1` > 2 and `tt`.`f1` > 2
explain format=json 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;
EXPLAIN
{ "query_block": { "select_id": 1, "cost": "COST_REPLACED", "nested_loop": [
{ "table": { "table_name": "<derived3>", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "tt.f1 > 2 and tt.f1 > 2 and tt.f1 is not null", "materialized": { "query_block": { "select_id": 3, "cost": "COST_REPLACED", "filesort": { "sort_key": "t1.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "t1", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t1.f1 < 7 and t1.f1 > 2 and t1.f1 > 2"
}
}
]
}
}
}
}
}
},
{ "table": { "table_name": "<derived5>", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["f1"], "ref": ["tt.f1"], "loops": 11, "rows": 1, "cost": "COST_REPLACED", "filtered": 100, "materialized": { "query_block": { "select_id": 5, "cost": "COST_REPLACED", "filesort": { "sort_key": "t1.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "t1", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t1.f1 < 7 and t1.f1 > 2 and t1.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 3333 5555
show status like 'Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 2
Handler_read_last 0
Handler_read_next 2
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 4
Handler_read_rnd_deleted 0
Handler_read_rnd_next 33
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 11100.00 Using where 1 SIMPLE t1 ALL NULL NULL NULL NULL 11100.00 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` > 2and `test`.`t1`.`f1` < 7and `test`.`t1`.`f1` > 2and `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 3333 5555
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 NULL NULL NULL NULL 11100.00 Using where 1 PRIMARY <derived4> ref key0 key0 5 x.f1 1100.00 4 DERIVED <derived5> ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort 5 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort 2 DERIVED <derived3> ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `x`.`f1` AS `f1`,`x`.`f11` AS `f11`,`z`.`f1` AS `f1`,`z`.`f11` AS `f11` from (/* select#2 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#3 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where `test`.`t1`.`f1` < 7 and `test`.`t1`.`f1` > 2 group by `test`.`t1`.`f1`) `tt` where `tt`.`f1` > 2 group by `tt`.`f1`) `x` join (/* select#4 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#5 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where `test`.`t1`.`f1` < 7 and `test`.`t1`.`f1` > 2 group by `test`.`t1`.`f1`) `tt` where `tt`.`f1` > 2 group by `tt`.`f1`) `z` where `z`.`f1` = `x`.`f1`
explain format=json 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;
EXPLAIN
{ "query_block": { "select_id": 1, "cost": "COST_REPLACED", "nested_loop": [
{ "table": { "table_name": "<derived2>", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "x.f1 is not null", "materialized": { "query_block": { "select_id": 2, "cost": "COST_REPLACED", "filesort": { "sort_key": "tt.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "<derived3>", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "tt.f1 > 2", "materialized": { "query_block": { "select_id": 3, "cost": "COST_REPLACED", "filesort": { "sort_key": "t1.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "t1", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t1.f1 < 7 and t1.f1 > 2"
}
}
]
}
}
}
}
}
}
]
}
}
}
}
}
},
{ "table": { "table_name": "<derived4>", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["f1"], "ref": ["x.f1"], "loops": 11, "rows": 1, "cost": "COST_REPLACED", "filtered": 100, "materialized": { "query_block": { "select_id": 4, "cost": "COST_REPLACED", "filesort": { "sort_key": "tt.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "<derived5>", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "tt.f1 > 2", "materialized": { "query_block": { "select_id": 5, "cost": "COST_REPLACED", "filesort": { "sort_key": "t1.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "t1", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t1.f1 < 7 and t1.f1 > 2"
}
}
]
}
}
}
}
}
}
]
}
}
}
}
}
}
]
}
}
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 3333 5555
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 11100.00 2 DERIVED t2 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `tt`.`f2` AS `f2`,`tt`.`f22` AS `f22` from (/* select#2 */ 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 22 33
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 PRIMARY <derived3> ALL NULL NULL NULL NULL 11100.00 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1` where `v1`.`f1` < 7
explain format=json
select * from ( select * from v1 where f1 < 7) tt;
EXPLAIN
{ "query_block": { "select_id": 1, "cost": "COST_REPLACED", "nested_loop": [
{ "table": { "table_name": "<derived3>", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "v1.f1 < 7", "materialized": { "query_block": { "select_id": 3, "cost": "COST_REPLACED", "filesort": { "sort_key": "t1.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "t1", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t1.f1 < 7"
}
}
]
}
}
}
}
}
}
]
}
}
select * from ( select * from v1 where f1 < 7) tt;
f1 f11 11 22 33 55
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 11100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`t2` where `test`.`t2`.`f2` < 7and `test`.`t2`.`f2` in (2,3)
select * from (select * from v6) tt;
f2 f22 33 22
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 11100.00 2 DERIVED <derived4> ALL NULL NULL NULL NULL 11100.00 Using temporary; Using filesort 4 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (/* select#2 */ 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 11 22 33 55 77 99 1111 1313 1515 1717 1919
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 PRIMARY t2 ALL NULL NULL NULL NULL 11100.00 Using where 1 PRIMARY <derived5> ref key0 key0 5 test.t2.f2 1100.00 5 DERIVED t1 ALL NULL NULL NULL NULL 11100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ 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)
explain format=json select * from v6 join v7 on f2=f1;
EXPLAIN
{ "query_block": { "select_id": 1, "cost": "COST_REPLACED", "nested_loop": [
{ "table": { "table_name": "t2", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t2.f2 < 7 and t2.f2 in (2,3) and t2.f2 is not null"
}
},
{ "table": { "table_name": "<derived5>", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["f1"], "ref": ["test.t2.f2"], "loops": 11, "rows": 1, "cost": "COST_REPLACED", "filtered": 100, "materialized": { "query_block": { "select_id": 5, "cost": "COST_REPLACED", "filesort": { "sort_key": "t1.f1", "temporary_table": { "nested_loop": [
{ "table": { "table_name": "t1", "access_type": "ALL", "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "attached_condition": "t1.f1 < 7 and t1.f1 in (2,3)"
}
}
]
}
}
}
}
}
}
]
}
}
select * from v6 join v7 on f2=f1;
f2 f22 f1 f11 3333 2222
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 1 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 111111 222222 333333
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 1 2 DERIVED t1 ALL NULL NULL NULL NULL 4
SELECT * FROM v1 JOIN t2 ON v1.f1 = t2.f1;
f1 f1 149149 224224
DROP VIEW v1;
DROP TABLE t1,t2;
#
# LP bug #794890: abort failure on multi-update with view
#
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (20), (7);
CREATE TABLE t2 (a int);
INSERT INTO t2 VALUES (7), (9), (7);
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT a FROM t1;
CREATE VIEW v2 AS SELECT t2.a FROM t2, v1 WHERE t2.a=t2.a;
UPDATE v2 SET a = 2;
SELECT * FROM t2;
a 2 2 2
UPDATE t1,v2 SET t1.a = 3;
SELECT * FROM t1;
a 3 3
DELETE t1 FROM t1,v2;
SELECT * FROM t1;
a
DROP VIEW v1,v2;
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=7AND b<75; MAX(b) 74
EXPLAIN
SELECT MAX(b) FROM t1 WHERE a=7AND 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=7AND b<75; MAX(b) 74
EXPLAIN
SELECT MAX(b) FROM (SELECT * FROM t1) t WHERE a=7AND 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=7AND b<75; MAX(b) 74
EXPLAIN
SELECT MAX(b) FROM v1 WHERE a=7AND 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;
#
# LP bug #800535: GROUP BY query with nested left join
# and a derived table in the nest
#
CREATE TABLE t1 (a int) ;
INSERT INTO t1 VALUES (1), (2);
CREATE TABLE t2 (a int NOT NULL);
INSERT INTO t2 VALUES (1), (2);
CREATE TABLE t3 (a int, b int);
INSERT INTO t3 VALUES (3,3), (4,4);
EXPLAIN EXTENDED
SELECT t.a FROM t1 LEFT JOIN
(t2 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2100.00 Using temporary; Using filesort 1 SIMPLE t ALL NULL NULL NULL NULL 2100.00 Using where 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 Using where
Warnings:
Note 1003 select `test`.`t`.`a` AS `a` from `test`.`t1` left join (`test`.`t2` `t` join `test`.`t3`) on(`test`.`t`.`a` >= 1and `test`.`t3`.`b` > 5) where 1 group by `test`.`t`.`a`
SELECT t.a FROM t1 LEFT JOIN
(t2 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
a
NULL
EXPLAIN EXTENDED
SELECT t.a FROM t1 LEFT JOIN
(( SELECT * FROM t2 ) t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2100.00 Using temporary; Using filesort 1 SIMPLE t2 ALL NULL NULL NULL NULL 2100.00 Using where 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`a` >= 1and `test`.`t3`.`b` > 5) where 1 group by `test`.`t2`.`a`
SELECT t.a FROM t1 LEFT JOIN
(( SELECT * FROM t2 ) t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
a
NULL
CREATE VIEW v1 AS SELECT * FROM t2;
EXPLAIN EXTENDED
SELECT t.a FROM t1 LEFT JOIN
(v1 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2100.00 Using temporary; Using filesort 1 SIMPLE t2 ALL NULL NULL NULL NULL 2100.00 Using where 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`a` >= 1and `test`.`t3`.`b` > 5) where 1 group by `test`.`t2`.`a`
SELECT t.a FROM t1 LEFT JOIN
(v1 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
a
NULL
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# LP bug #803410: materialized view/dt accessed by two-component key
#
CREATE TABLE t1 (a varchar(1)) CHARSET=latin1;
INSERT INTO t1 VALUES ('c');
CREATE TABLE t2 (a varchar(1) , KEY (a)) CHARSET=latin1;
INSERT INTO t2 VALUES ('c'), (NULL), ('r');
CREATE TABLE t3 (a varchar(1), b varchar(1)) CHARSET=latin1;
INSERT INTO t3 VALUES
('e', 'c'), ('c', 'c'), ('c', 'r'), ('g', 'a'), ('b', 'x'), ('b', 'y'),
('h', 'w'), ('d', 'z'), ('k', 'v'), ('j', 's'), ('m', 'p'), ('l', 'q');
CREATE VIEW v1 AS SELECT a, MIN(b) AS b FROM t3 GROUP BY a;
EXPLAIN
SELECT * FROM t1, t2, v1 WHERE t2.a=t1.a AND t2.a=v1.a AND t2.a=v1.b;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 1 PRIMARY t2 ref a a 4 const 1 Using index 1 PRIMARY <derived2> ref key1 key1 8 func,func 1 2 DERIVED t3 ALL NULL NULL NULL NULL 12 Using temporary; Using filesort
SELECT * FROM t1, t2, v1 WHERE t2.a=t1.a AND t2.a=v1.a AND t2.a=v1.b;
a a a b
c c c c
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# LP bug #802845: select from derived table with limit 0
#
SELECT * FROM (SELECT 1 LIMIT 0) t; 1
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (7), (1), (3);
SELECT * FROM (SELECT * FROM t1 LIMIT 0) t;
a
DROP TABLE t1;
#
# LP bug #803851: materialized view + IN->EXISTS
# SET SESSION optimizer_switch='semijoin=off,derived_with_keys=on,materialization=off';
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (2,2), (3,3), (1,1);
CREATE TABLE t2 (a int);
INSERT INTO t2 VALUES (1), (2), (1);
CREATE TABLE t3 (a int);
INSERT INTO t3 VALUES (3), (1), (2), (1);
CREATE VIEW v1 AS SELECT a, MAX(b) AS b FROM t1 GROUP BY a;
EXPLAIN EXTENDED
SELECT * FROM t3
WHERE t3.a IN (SELECT v1.a FROM v1, t2 WHERE t2.a = v1.b);
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 4100.00 Using where 2 DEPENDENT SUBQUERY <derived3> ref key1 key1 5 func 1100.00 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 3100.00 Using where; Using join buffer (flat, BNL join) 3 DERIVED t1 ALL NULL NULL NULL NULL 3100.00 Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where <expr_cache><`test`.`t3`.`a`>(<in_optimizer>(`test`.`t3`.`a`,<exists>(/* select#2 */ select `v1`.`a` from `test`.`v1` join `test`.`t2` where `test`.`t2`.`a` = `v1`.`b` and <cache>(`test`.`t3`.`a`) = `v1`.`a`)))
SELECT * FROM t3
WHERE t3.a IN (SELECT v1.a FROM v1, t2 WHERE t2.a = v1.b);
a 1 2 1 SET SESSION optimizer_switch=@save_optimizer_switch;
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# LP bug #804515: materialized derived + ORDER BY
#
CREATE TABLE t1 (f1 varchar(1), f2 varchar(1), KEY (f2)) CHARSET=latin1;
INSERT INTO t1 VALUES
('r','x'), ('x','d'), ('x','r'), ('r','f'), ('x','x');
CREATE TABLE t2 (f1 varchar(1), f2 varchar(1)) CHARSET=latin1;
INSERT INTO t2 VALUES ('s','x');
CREATE TABLE t3 (f1 varchar(1), f2 varchar(1), KEY (f2)) CHARSET=latin1;
INSERT INTO t3 VALUES
(NULL,'x'), (NULL,'f'), ('t','p'), (NULL,'j'), ('g','c');
CREATE TABLE t4 (f1 int, f2 varchar(1), KEY (f2,f1)) CHARSET=latin1;
INSERT INTO t4 VALUES (1,'x'), (5,'r');
EXPLAIN
SELECT t.f1 AS f
FROM (SELECT DISTINCT t1.* FROM t1,t2 WHERE t2.f2 = t1.f2) t,t3,t4
WHERE t4.f2 = t3.f2 AND t4.f2 = t.f1 ORDER BY f;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t4 index f2 f2 9 NULL 2 Using where; Using index; Using temporary; Using filesort 1 PRIMARY <derived2> ref key1 key1 4 test.t4.f2 1 1 PRIMARY t3 ref f2 f2 4 test.t4.f2 1 Using index 2 DERIVED t2 system NULL NULL NULL NULL 1 Using temporary 2 DERIVED t1 ref f2 f2 4 const 2 Using where
SELECT t.f1 AS f
FROM (SELECT DISTINCT t1.* FROM t1,t2 WHERE t2.f2 = t1.f2) t,t3,t4
WHERE t4.f2 = t3.f2 AND t4.f2 = t.f1 ORDER BY f;
f
x
DROP TABLE t1,t2,t3,t4;
#
# LP bug #806431: join over materialized derived with key
#
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (0,0),(3,0),(1,0);
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT a,b FROM t1 ; SET SESSION optimizer_switch='derived_with_keys=off';
SELECT * FROM t1 AS t JOIN v1 AS v WHERE t.a = v.b AND t.b = v.b;
a b a b 0000 0030 0010 SET SESSION optimizer_switch='derived_with_keys=on';
EXPLAIN
SELECT * FROM t1 AS t JOIN v1 AS v WHERE t.a = v.b AND t.b = v.b;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t ALL NULL NULL NULL NULL 3 Using where 1 PRIMARY <derived2> ref key0 key0 5 test.t.a 1 2 DERIVED t1 ALL NULL NULL NULL NULL 3
SELECT * FROM t1 AS t JOIN v1 AS v WHERE t.a = v.b AND t.b = v.b;
a b a b 0010 0030 0000 SET SESSION optimizer_switch=@save_optimizer_switch;
DROP VIEW v1;
DROP TABLE t1;
#
# LP bug #806477: left join over merged join with
# where condition containing f=f
#
CREATE TABLE t1 (a int NOT NULL);
INSERT INTO t1 VALUES (1), (50), (0);
CREATE TABLE t2 (a int);
CREATE TABLE t3 (a int, b int);
INSERT INTO t3 VALUES (76,2), (1,NULL);
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT t3.b, v1.a
FROM t3 LEFT JOIN (t2, v1) ON t3.a <> 0
WHERE v1.a = v1.a OR t3.b <> 0;
b a 2 NULL
EXPLAIN EXTENDED
SELECT t3.b, v1.a
FROM t3 LEFT JOIN (t2, v1) ON t3.a <> 0
WHERE v1.a = v1.a OR t3.b <> 0;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 1 SIMPLE t2 ALL NULL NULL NULL NULL 00.00 Using where 1 SIMPLE t1 ALL NULL NULL NULL NULL 3100.00 Using where
Warnings:
Note 1003 select `test`.`t3`.`b` AS `b`,`test`.`t1`.`a` AS `a` from `test`.`t3` left join (`test`.`t2` join `test`.`t1`) on(`test`.`t3`.`a` <> 0) where `test`.`t1`.`a` = `test`.`t1`.`a` or `test`.`t3`.`b` <> 0
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# LP bug #806510: subquery with outer reference
# to a derived_table/view
#
CREATE TABLE t1 (a int) ;
INSERT INTO t1 VALUES (4), (NULL);
CREATE TABLE t2 (a int) ;
INSERT INTO t2 VALUES (8), (0);
CREATE TABLE t3 (a int, b int) ;
INSERT INTO t3 VALUES (7,8);
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT * FROM t1 t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
a 4
EXPLAIN
SELECT * FROM t1 t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t ALL NULL NULL NULL NULL 2 Using where 2 DEPENDENT SUBQUERY t3 system NULL NULL NULL NULL 1 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM (SELECT * FROM t1) t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
a 4
EXPLAIN
SELECT * FROM (SELECT * FROM t1) t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 3 DEPENDENT SUBQUERY t3 system NULL NULL NULL NULL 1 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM v1 t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
a 4
EXPLAIN
SELECT * FROM v1 t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 2 DEPENDENT SUBQUERY t3 system NULL NULL NULL NULL 1 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# LP bug #806097: left join over a view + DISTINCT
#
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (252,6), (232,0), (174,232);
CREATE TABLE t2 (a int);
INSERT INTO t2 VALUES (232), (174);
CREATE TABLE t3 (c int);
INSERT INTO t3 VALUES (1), (2);
CREATE VIEW v1 AS SELECT t2.a FROM t3,t2;
SELECT v1.a FROM t1 LEFT JOIN v1 ON t1.b = 0;
a
NULL 232 174 232 174
NULL
SELECT DISTINCT t2.a FROM t1 LEFT JOIN (t3,t2) ON t1.b = 0;
a
NULL 232 174
EXPLAIN
SELECT DISTINCT t2.a FROM t1 LEFT JOIN (t3,t2) ON t1.b = 0;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using temporary 1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 2
SELECT DISTINCT v1.a FROM t1 LEFT JOIN v1 ON t1.b = 0;
a
NULL 232 174
EXPLAIN
SELECT DISTINCT v1.a FROM t1 LEFT JOIN v1 ON t1.b = 0;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using temporary 1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 2
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# LP bug #806504: right join over a view/derived table
#
CREATE TABLE t1 (a int, b int) ;
INSERT INTO t1 VALUES (0,0);
CREATE TABLE t2 (a int) ;
INSERT INTO t2 VALUES (0), (0);
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT * FROM t2 RIGHT JOIN (SELECT * FROM t1) AS t ON t.a != 0
WHERE t.a IN (SELECT b FROM t1);
a a b
NULL 00
EXPLAIN EXTENDED
SELECT * FROM t2 RIGHT JOIN (SELECT * FROM t1) AS t ON t.a != 0
WHERE t.a IN (SELECT b FROM t1);
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1100.00 1 PRIMARY t1 system NULL NULL NULL NULL 1100.00 1 PRIMARY t2 ALL NULL NULL NULL NULL 2100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t2` semi join (dual) where 1
SELECT * FROM t2 RIGHT JOIN v1 AS t ON t.a != 0
WHERE t.a IN (SELECT b FROM t1);
a a b
NULL 00
EXPLAIN EXTENDED
SELECT * FROM t2 RIGHT JOIN v1 AS t ON t.a != 0
WHERE t.a IN (SELECT b FROM t1);
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1100.00 1 PRIMARY t1 system NULL NULL NULL NULL 1100.00 1 PRIMARY t2 ALL NULL NULL NULL NULL 2100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a`,0 AS `a`,0 AS `b` from `test`.`t2` semi join (dual) where 1
DROP VIEW v1;
DROP TABLE t1,t2;
#
# LP bug #809206: DISTINCT in derived table / view
#
CREATE TABLE t1 (a int) ;
INSERT INTO t1 VALUES (0);
CREATE TABLE t2 (a varchar(32), b int, KEY (a)) CHARSET=latin1;
INSERT INTO t2 VALUES
('j',28), ('c',29), ('i',26), ('c',29), ('k',27),
('j',28), ('c',29), ('i',25), ('d',26), ('k',27),
('n',28), ('d',29), ('m',26), ('e',29), ('p',27),
('w',28), ('x',29), ('y',25), ('z',26), ('s',27);
CREATE TABLE t3 (a varchar(32)) CHARSET=latin1;
INSERT INTO t3 VALUES ('j'), ('c');
CREATE VIEW v1 AS SELECT DISTINCT t2.b FROM t1,t2,t3 WHERE t3.a = t2.a;
SELECT DISTINCT t2.b FROM t1,t2,t3 WHERE t3.a = t2.a;
b 28 29
EXPLAIN
SELECT DISTINCT t2.b FROM t1,t2,t3 WHERE t3.a = t2.a;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 system NULL NULL NULL NULL 1 Using temporary 1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using where 1 SIMPLE t2 ref a a 35 test.t3.a 2
SELECT * FROM (SELECT DISTINCT t2.b FROM t1,t2,t3 WHERE t3.a = t2.a) t;
b 28 29
EXPLAIN
SELECT * FROM (SELECT DISTINCT t2.b FROM t1,t2,t3 WHERE t3.a = t2.a) t;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 2 DERIVED t1 system NULL NULL NULL NULL 1 Using temporary 2 DERIVED t3 ALL NULL NULL NULL NULL 2 Using where 2 DERIVED t2 ref a a 35 test.t3.a 2
SELECT * FROM v1;
b 28 29
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 4 2 DERIVED t1 system NULL NULL NULL NULL 1 Using temporary 2 DERIVED t3 ALL NULL NULL NULL NULL 2 Using where 2 DERIVED t2 ref a a 35 test.t3.a 2
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# LP bug #809179: right join over a derived table / view
#
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (6,5);
CREATE TABLE t2 (a int, b int);
INSERT INTO t2 VALUES (1,0);
CREATE TABLE t3 (a int, b int);
INSERT INTO t3 VALUES (6,5);
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT t.a,t.b FROM t3 RIGHT JOIN (t1 AS t, t2) ON t2.b != 0
WHERE (t.a,t.b) NOT IN (SELECT 7, 5);
a b 65
EXPLAIN EXTENDED
SELECT t.a,t.b FROM t3 RIGHT JOIN (t1 AS t, t2) ON t2.b != 0
WHERE (t.a,t.b) NOT IN (SELECT 7, 5);
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t system NULL NULL NULL NULL 1100.00 1 PRIMARY t2 system NULL NULL NULL NULL 1100.00 1 PRIMARY t3 system NULL NULL NULL NULL 1100.00 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003/* select#1 */ select 6 AS `a`,5 AS `b` from `test`.`t3` where 1
SELECT t.a,t.b FROM t3 RIGHT JOIN ((SELECT * FROM t1) AS t, t2) ON t2.b != 0
WHERE (t.a,t.b) NOT IN (SELECT 7, 5);
a b 65
EXPLAIN EXTENDED
SELECT t.a,t.b FROM t3 RIGHT JOIN ((SELECT * FROM t1) AS t, t2) ON t2.b != 0
WHERE (t.a,t.b) NOT IN (SELECT 7, 5);
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1100.00 1 PRIMARY t2 system NULL NULL NULL NULL 1100.00 1 PRIMARY t3 system NULL NULL NULL NULL 1100.00 3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003/* select#1 */ select 6 AS `a`,5 AS `b` from `test`.`t3` where 1
SELECT t.a,t.b FROM t3 RIGHT JOIN (v1 AS t, t2) ON t2.b != 0
WHERE (t.a,t.b) NOT IN (SELECT 7, 5);
a b 65
EXPLAIN EXTENDED
SELECT t.a,t.b FROM t3 RIGHT JOIN (v1 AS t, t2) ON t2.b != 0
WHERE (t.a,t.b) NOT IN (SELECT 7, 5);
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1100.00 1 PRIMARY t2 system NULL NULL NULL NULL 1100.00 1 PRIMARY t3 system NULL NULL NULL NULL 1100.00 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003/* select#1 */ select 6 AS `a`,5 AS `b` from `test`.`t3` where 1
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# LP bug #794901: insert into a multi-table view
#
CREATE TABLE t1 (a int);
CREATE TABLE t2 (a int);
CREATE TABLE t3 (a int);
CREATE VIEW v1 AS SELECT t1.a FROM t1,t2;
CREATE VIEW v2 AS SELECT a FROM t2 GROUP BY a;
CREATE VIEW v3 AS SELECT v1.a FROM v1,v2;
INSERT INTO v3(a) VALUES (1); ERROR HY000: The target table v3 of the INSERT is not insertable-into
DROP VIEW v1,v2,v3;
DROP TABLE t1,t2,t3;
#
# LP bug #793448: materialized view accessed by two-component key
#
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (9,3), (2,5);
CREATE TABLE t2 (a int, b int);
INSERT INTO t2 VALUES (9,3), (3,7), (9,1), (2,5), (2,4), (3,8);
CREATE TABLE t3 (a int, b int);
INSERT INTO t3 VALUES (10,3), (9,7), (9,1), (2,4);
CREATE VIEW v1(a,b) AS SELECT a, MAX(b) FROM t2 GROUP BY a;
CREATE VIEW v2(a,b) AS SELECT a,b FROM t2 UNION SELECT a,b FROM t3;
SELECT * FROM v1;
a b 25 38 93
SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v1);
a 9 2
EXPLAIN
SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v1);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY <derived3> ref key0 key0 10 test.t1.a,test.t1.b 1 FirstMatch(t1) 3 DERIVED t2 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort
SELECT * FROM v2;
a b 93 37 91 25 24 38 103 97
SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v2);
a 9 2
EXPLAIN
SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v2);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY <derived3> eq_ref distinct_key distinct_key 10 test.t1.a,test.t1.b 1 3 DERIVED t2 ALL NULL NULL NULL NULL 6 4 UNION t3 ALL NULL NULL NULL NULL 4
NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
DROP VIEW v1,v2;
DROP TABLE t1,t2,t3;
#
# LP bug #804686: query over a derived table using a view
# with a degenerated where condition
#
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (0,0), (1,0), (0,0), (1,1), (1,0);
CREATE VIEW v1 AS SELECT a,b FROM t1;
CREATE VIEW v2 AS SELECT a, MAX(b) AS b FROM t1 GROUP BY a;
SELECT * FROM (SELECT b FROM v1 WHERE b = 0) t WHERE b<>0;
b
SELECT * FROM (SELECT b FROM v2 WHERE b = 0) t WHERE b<>0;
b
SELECT * FROM (SELECT b FROM v1 WHERE b = 0) t WHERE b;
b
SELECT * FROM (SELECT b FROM v2 WHERE b = 0) t WHERE b;
b
EXPLAIN EXTENDED
SELECT * FROM (SELECT b FROM v1 WHERE b = 0) t WHERE b;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings:
Note 1003 select `test`.`t1`.`b` AS `b` from `test`.`t1` where 0
EXPLAIN EXTENDED
SELECT * FROM (SELECT b FROM v2 WHERE b = 0) t WHERE b;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 3 DERIVED t1 ALL NULL NULL NULL NULL 5100.00 Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `v2`.`b` AS `b` from `test`.`v2` where 0
DROP VIEW v1,v2;
DROP TABLE t1;
#
# LP bug #819716: crash with embedded tableless materialized derived
# with a variable
# set optimizer_switch='derived_merge=off';
EXPLAIN
SELECT * FROM (SELECT * FROM (SELECT @b) AS t) AS s;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 1 2 DERIVED <derived3> system NULL NULL NULL NULL 1 3 DERIVED NULL NULL NULL NULL NULL NULL NULL No tables used
SELECT * FROM (SELECT * FROM (SELECT @b) AS t) AS s;
@b
NULL set optimizer_switch='derived_merge=on';
#
# LP bug #823826: view over join + IS NULL in WHERE
#
CREATE TABLE t1 (a int) ;
INSERT INTO t1 VALUES (1), (1);
CREATE TABLE t2 (b int) ;
INSERT INTO t2 VALUES (9), (NULL), (7);
CREATE VIEW v1 AS SELECT * FROM t1,t2;
EXPLAIN
SELECT * FROM (SELECT * FROM t1,t2) t WHERE b IS NULL;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
SELECT * FROM (SELECT * FROM t1,t2) t WHERE b IS NULL;
a b 1 NULL 1 NULL
EXPLAIN
SELECT * FROM v1 WHERE b IS NULL;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
SELECT * FROM v1 WHERE b IS NULL;
a b 1 NULL 1 NULL
DROP VIEW v1;
DROP TABLE t1,t2;
#
# LP bug #823835: a duplicate of #823189 with derived table
#
CREATE TABLE t1 (a varchar(32)) ;
INSERT INTO t1 VALUES ('r'), ('p');
CREATE TABLE t2 (a int NOT NULL, b varchar(32)) ;
INSERT INTO t2 VALUES (28,'j');
CREATE TABLE t3 (a int);
INSERT INTO t3 VALUES (0), (0);
EXPLAIN EXTENDED
SELECT * FROM (SELECT * FROM t1) AS t
WHERE EXISTS (SELECT t2.a FROM t3 RIGHT JOIN t2 ON (t3.a = t2.a)
WHERE t2.b < t.a);
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2100.00 Using where 3 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1100.00 3 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 2100.00 Using where
Warnings:
Note 1276 Field or reference 't.a' of SELECT #3 was resolved in SELECT #1
Note 1003/* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where <in_optimizer>(1,<expr_cache><`test`.`t1`.`a`>(exists(/* select#3 */ select 28 from `test`.`t3` where 'j' < `test`.`t1`.`a` limit 1)))
SELECT * FROM (SELECT * FROM t1) AS t
WHERE EXISTS (SELECT t2.a FROM t3 RIGHT JOIN t2 ON (t3.a = t2.a)
WHERE t2.b < t.a);
a
r
p
DROP TABLE t1,t2,t3;
#
# LP bug #824463: nested outer join using a merged view
# as an inner table
#
CREATE TABLE t1 (b int, a int) ;
CREATE TABLE t2 (a int) ;
INSERT INTO t2 VALUES (5), (6);
CREATE TABLE t3 (a int , c int) ;
INSERT INTO t3 VALUES (22,1), (23,-1);
CREATE TABLE t4 (a int);
CREATE TABLE t5 (d int) ;
INSERT INTO t5 VALUES (0), (7), (3), (5);
CREATE VIEW v2 AS SELECT * FROM t2;
CREATE VIEW v3 AS SELECT * FROM t3;
EXPLAIN EXTENDED
SELECT STRAIGHT_JOIN *
FROM ( t2 AS s2
JOIN
( t3 AS s3
LEFT JOIN
( t4 LEFT JOIN t3 ON t4.a != 0 )
ON s3.a != 0)
ON s2.a != 0)
JOIN t5 ON s3.c != 0AND t5.d = 0;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE s2 ALL NULL NULL NULL NULL 2100.00 Using where 1 SIMPLE s3 ALL NULL NULL NULL NULL 2100.00 Using where; Using join buffer (flat, BNL join) 1 SIMPLE t4 ALL NULL NULL NULL NULL 00.00 Using where 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 Using where 1 SIMPLE t5 ALL NULL NULL NULL NULL 4100.00 Using where; Using join buffer (flat, BNL join)
Warnings:
Note 1003 select straight_join `test`.`s2`.`a` AS `a`,`test`.`s3`.`a` AS `a`,`test`.`s3`.`c` AS `c`,`test`.`t4`.`a` AS `a`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`c` AS `c`,`test`.`t5`.`d` AS `d` from `test`.`t2` `s2` join `test`.`t3` `s3` left join (`test`.`t4` left join `test`.`t3` on(`test`.`t4`.`a` <> 0)) on(`test`.`s3`.`a` <> 0) join `test`.`t5` where `test`.`t5`.`d` = 0and `test`.`s3`.`c` <> 0and `test`.`s2`.`a` <> 0
SELECT STRAIGHT_JOIN *
FROM ( t2 AS s2
JOIN
( t3 AS s3
LEFT JOIN
( t4 LEFT JOIN t3 ON t4.a != 0 )
ON s3.a != 0)
ON s2.a != 0)
JOIN t5 ON s3.c != 0AND t5.d = 0;
a a c a a c d 5221 NULL NULL NULL 0 6221 NULL NULL NULL 0 523 -1 NULL NULL NULL 0 623 -1 NULL NULL NULL 0
EXPLAIN EXTENDED
SELECT STRAIGHT_JOIN *
FROM t2 AS s2 , t5,
(t3 LEFT JOIN (t4 LEFT JOIN t3 AS s3 ON t4.a != 0) ON t3.a != 0)
WHERE s2.a != 0AND t3.c != 0AND t5.d = 0;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE s2 ALL NULL NULL NULL NULL 2100.00 Using where 1 SIMPLE t5 ALL NULL NULL NULL NULL 4100.00 Using where; Using join buffer (flat, BNL join) 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 Using where; Using join buffer (flat, BNL join) 1 SIMPLE t4 ALL NULL NULL NULL NULL 00.00 Using where 1 SIMPLE s3 ALL NULL NULL NULL NULL 2100.00 Using where
Warnings:
Note 1003 select straight_join `test`.`s2`.`a` AS `a`,`test`.`t5`.`d` AS `d`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`c` AS `c`,`test`.`t4`.`a` AS `a`,`test`.`s3`.`a` AS `a`,`test`.`s3`.`c` AS `c` from `test`.`t2` `s2` join `test`.`t5` join `test`.`t3` left join (`test`.`t4` left join `test`.`t3` `s3` on(`test`.`t4`.`a` <> 0)) on(`test`.`t3`.`a` <> 0) where `test`.`t5`.`d` = 0and `test`.`s2`.`a` <> 0and `test`.`t3`.`c` <> 0
SELECT STRAIGHT_JOIN *
FROM t2 AS s2 , t5,
(t3 LEFT JOIN (t4 LEFT JOIN t3 AS s3 ON t4.a != 0) ON t3.a != 0)
WHERE s2.a != 0AND t3.c != 0AND t5.d = 0;
a d a c a a c 50221 NULL NULL NULL 60221 NULL NULL NULL 5023 -1 NULL NULL NULL 6023 -1 NULL NULL NULL
EXPLAIN EXTENDED
SELECT STRAIGHT_JOIN *
FROM v2 AS s2 , t5,
(t3 LEFT JOIN (t4 LEFT JOIN v3 AS s3 ON t4.a != 0) ON t3.a != 0)
WHERE s2.a != 0AND t3.c != 0AND t5.d = 0;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 ALL NULL NULL NULL NULL 2100.00 Using where 1 SIMPLE t5 ALL NULL NULL NULL NULL 4100.00 Using where; Using join buffer (flat, BNL join) 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 Using where; Using join buffer (flat, BNL join) 1 SIMPLE t4 ALL NULL NULL NULL NULL 00.00 Using where 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 Using where
Warnings:
Note 1003 select straight_join `test`.`t2`.`a` AS `a`,`test`.`t5`.`d` AS `d`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`c` AS `c`,`test`.`t4`.`a` AS `a`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`c` AS `c` from `test`.`t2` join `test`.`t5` join `test`.`t3` left join (`test`.`t4` left join (`test`.`t3`) on(`test`.`t4`.`a` <> 0)) on(`test`.`t3`.`a` <> 0) where `test`.`t5`.`d` = 0and `test`.`t2`.`a` <> 0and `test`.`t3`.`c` <> 0
SELECT STRAIGHT_JOIN *
FROM v2 AS s2 , t5,
(t3 LEFT JOIN (t4 LEFT JOIN v3 AS s3 ON t4.a != 0) ON t3.a != 0)
WHERE s2.a != 0AND t3.c != 0AND t5.d = 0;
a d a c a a c 50221 NULL NULL NULL 60221 NULL NULL NULL 5023 -1 NULL NULL NULL 6023 -1 NULL NULL NULL
SELECT STRAIGHT_JOIN *
FROM ( ( t2 AS s2
LEFT JOIN
( t3 AS s3
LEFT JOIN
( t4 AS s4 JOIN t3 ON s4.a != 0)
ON s3.a != 0 )
ON s2.a != 0)
LEFT JOIN
t1 AS s1
ON s1.a != 0)
JOIN t5 ON s3.c != 0;
a a c a a c b a d 5221 NULL NULL NULL NULL NULL 0 6221 NULL NULL NULL NULL NULL 0 523 -1 NULL NULL NULL NULL NULL 0 623 -1 NULL NULL NULL NULL NULL 0 5221 NULL NULL NULL NULL NULL 7 6221 NULL NULL NULL NULL NULL 7 523 -1 NULL NULL NULL NULL NULL 7 623 -1 NULL NULL NULL NULL NULL 7 5221 NULL NULL NULL NULL NULL 3 6221 NULL NULL NULL NULL NULL 3 523 -1 NULL NULL NULL NULL NULL 3 623 -1 NULL NULL NULL NULL NULL 3 5221 NULL NULL NULL NULL NULL 5 6221 NULL NULL NULL NULL NULL 5 523 -1 NULL NULL NULL NULL NULL 5 623 -1 NULL NULL NULL NULL NULL 5
SELECT STRAIGHT_JOIN *
FROM ( ( v2 AS s2
LEFT JOIN
( v3 AS s3
LEFT JOIN
( t4 AS s4 JOIN v3 ON s4.a != 0)
ON s3.a != 0 )
ON s2.a != 0)
LEFT JOIN
t1 AS s1
ON s1.a != 0)
JOIN t5 ON s3.c != 0;
a a c a a c b a d 5221 NULL NULL NULL NULL NULL 0 6221 NULL NULL NULL NULL NULL 0 523 -1 NULL NULL NULL NULL NULL 0 623 -1 NULL NULL NULL NULL NULL 0 5221 NULL NULL NULL NULL NULL 7 6221 NULL NULL NULL NULL NULL 7 523 -1 NULL NULL NULL NULL NULL 7 623 -1 NULL NULL NULL NULL NULL 7 5221 NULL NULL NULL NULL NULL 3 6221 NULL NULL NULL NULL NULL 3 523 -1 NULL NULL NULL NULL NULL 3 623 -1 NULL NULL NULL NULL NULL 3 5221 NULL NULL NULL NULL NULL 5 6221 NULL NULL NULL NULL NULL 5 523 -1 NULL NULL NULL NULL NULL 5 623 -1 NULL NULL NULL NULL NULL 5
DROP VIEW v2,v3;
DROP TABLE t1,t2,t3,t4,t5;
#
# LP bug #872735: derived used in a NOT IN subquery
#
CREATE TABLE t1 (b int NOT NULL);
INSERT INTO t1 VALUES (9), (7);
CREATE TABLE t2 (a int NOT NULL) ;
INSERT INTO t2 VALUES (1), (2);
CREATE TABLE t3 (
a int NOT NULL , c int NOT NULL, d varchar(1) NOT NULL,
KEY (c,a) , PRIMARY KEY (a)
);
INSERT INTO t3 VALUES
(14,4,'a'), (15,7,'b'), (16,4,'c'), (17,1,'d'), (18,9,'e'),
(19,4,'f'), (20,8,'g'); SET SESSION optimizer_switch='derived_merge=on,subquery_cache=off,materialization=off';
# The following two EXPLAINs must return the same execution plan
EXPLAIN
SELECT * FROM t1 , t2
WHERE (t2.a ,t1.b) NOT IN (SELECT DISTINCT c,a FROM t3 t);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join) 2 DEPENDENT SUBQUERY t index_subquery PRIMARY,c c 8 func,func 1 Using index; Using where
EXPLAIN
SELECT * FROM t1 , t2
WHERE (t2.a ,t1.b) NOT IN (SELECT DISTINCT c,a FROM (SELECT * FROM t3) t);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join) 2 DEPENDENT SUBQUERY t3 index_subquery PRIMARY,c c 8 func,func 1 Using index; Using where
SELECT * FROM t1 , t2
WHERE (t2.a ,t1.b) NOT IN (SELECT DISTINCT c,a FROM (SELECT * FROM t3) t);
b a 91 71 92 72
DROP TABLE t1,t2,t3;
#
# LP bug #874006: materialized view used in IN subquery
#
CREATE TABLE t3 (a int NOT NULL, b varchar(1), c varchar(1)) CHARSET=latin1;
INSERT INTO t3 VALUES (19,NULL,NULL), (20,'r','r');
CREATE TABLE t1 (a int, b varchar(1) , c varchar(1)) CHARSET=latin1;
INSERT INTO t1 VALUES (1,NULL,NULL), (5,'r','r'), (7,'y','y');
CREATE TABLE t2 (a int NOT NULL , b int, c varchar(1)) CHARSET=latin1;
INSERT INTO t2 VALUES (4,3,'r');
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1; SET @save_optimizer_switch=@@optimizer_switch; SET optimizer_switch='semijoin_with_cache=off'; SET SESSION optimizer_switch='derived_with_keys=off';
EXPLAIN
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY <derived3> ALL NULL NULL NULL NULL 3 Using where; FirstMatch(t3) 3 DERIVED t1 ALL NULL NULL NULL NULL 3 Using where
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
a b c 20 r r SET SESSION optimizer_switch='derived_with_keys=on';
EXPLAIN
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY <derived3> ref key1 key1 8 const,const 0 FirstMatch(t3) 3 DERIVED t1 ALL NULL NULL NULL NULL 3 Using where
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
a b c 20 r r SET optimizer_switch=@save_optimizer_switch;
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# LP bug #873263: materialized view used in correlated IN subquery
#
CREATE TABLE t1 (a int, b int) ;
INSERT INTO t1 VALUES (5,4), (9,8);
CREATE TABLE t2 (a int, b int) ;
INSERT INTO t2 VALUES (4,5), (5,1);
CREATE ALGORITHM=TEMPTABLE VIEW v2 AS SELECT * FROM t2; SET SESSION optimizer_switch='derived_with_keys=on';
EXPLAIN
SELECT * FROM t1 WHERE t1.b IN (SELECT v2.a FROM v2 WHERE v2.b = t1.a);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY <derived3> ref key0 key0 10 test.t1.b,test.t1.a 1 FirstMatch(t1) 3 DERIVED t2 ALL NULL NULL NULL NULL 2
SELECT * FROM t1 WHERE t1.b IN (SELECT v2.a FROM v2 WHERE v2.b = t1.a);
a b 54
DROP VIEW v2;
DROP TABLE t1,t2;
#
# LP bug #877316: query over a view with correlated subquery in WHERE
#
CREATE TABLE t1 (a int, b int, PRIMARY KEY (a)) ;
INSERT INTO t1 VALUES (18,2), (19,9);
CREATE TABLE t2 (a int, b int) ;
INSERT INTO t2 VALUES (10,8), (5,10);
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT t1.a FROM t1
WHERE EXISTS (SELECT t2.a FROM t2 WHERE t2.b < t1.b);
a 19
EXPLAIN
SELECT t1.a FROM t1
WHERE EXISTS (SELECT t2.a FROM t2 WHERE t2.b < t1.b);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT v1.a FROM v1
WHERE EXISTS (SELECT t2.a FROM t2 WHERE t2.b < v1.b);
a 19
EXPLAIN
SELECT v1.a FROM v1
WHERE EXISTS (SELECT t2.a FROM t2 WHERE t2.b < v1.b);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
DROP VIEW v1;
DROP TABLE t1,t2;
#
# LP bug #878199: join of two materialized views
#
CREATE TABLE t1 (a int, b varchar(1)) CHARSET=latin1;
INSERT INTO t1 VALUES (7,'c'), (3,'h'), (7,'c');
CREATE TABLE t2 (b varchar(1)) CHARSET=latin1;
INSERT INTO t2 VALUES ('p'), ('c'), ('j'), ('c'), ('p');
CREATE VIEW v1 AS SELECT * FROM t1 GROUP BY a,b;
CREATE VIEW v2 AS SELECT * FROM t2 GROUP BY b; SET SESSION optimizer_switch = 'derived_with_keys=on';
SELECT v1.a FROM v1,v2 WHERE v2.b = v1.b ORDER BY 1;
a 7
EXPLAIN
SELECT v1.a FROM v1,v2 WHERE v2.b = v1.b ORDER BY 1;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 Using where; Using filesort 1 PRIMARY <derived3> ref key0 key0 4 v1.b 1 3 DERIVED t2 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary; Using filesort
DROP VIEW v1,v2;
DROP TABLE t1,t2;
#
# Bug #743378: join over merged view employing BNL
#
CREATE TABLE t1 ( d varchar(1) NOT NULL) CHARSET=latin1;
INSERT INTO t1 VALUES ('j'),('v'),('c');
CREATE TABLE t2 (h time NOT NULL, d varchar(1) NOT NULL) CHARSET=latin1;
INSERT INTO t2 VALUES ('05:03:03','w'),('02:59:24','d'),('00:01:58','e');
CREATE TABLE t3 (
b int NOT NULL, e varchar(1) NOT NULL, d varchar(1) NOT NULL, KEY (e,b)
) CHARSET=latin1;
INSERT INTO t3 VALUES (4,'x','x'),(9,'w','w'),(4,'d','d'),(8,'e','e');
INSERT INTO t3 VALUES (14,'a','a'),(19,'b','b'),(14,'c','c'),(18,'d','d');
CREATE TABLE t4 (i int NOT NULL, m varchar(1) NOT NULL) CHARSET=latin1;
INSERT INTO t4 VALUES (8,'m'),(9,'d'),(2,'s'),(4,'r'),(8,'m');
CREATE TABLE t5 (
a int NOT NULL, c int NOT NULL, b int NOT NULL, f date NOT NULL,
g date NOT NULL, h time NOT NULL, j time NOT NULL, k datetime NOT NULL
);
INSERT INTO t5 VALUES
(1,4,0,'0000-00-00','0000-00-00','21:22:34','21:22:34','2002-02-13 17:30'),
(2,6,8,'2004-09-18','2004-09-18','10:50:38','10:50:38','2008-09-27 00:34');
CREATE VIEW v3 AS SELECT t3.*, t4.i FROM t3, t4, t5; SET SESSION join_cache_level = 1; SET SESSION join_buffer_size = 512;
EXPLAIN
SELECT t2.d FROM t1,t2,v3 WHERE v3.e = t2.d AND v3.i < 3;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t5 ALL NULL NULL NULL NULL 2 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join) 1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join) 1 SIMPLE t3 ref e e 3 test.t2.d 1 Using index 1 SIMPLE t4 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
SELECT t2.d FROM t1,t2,v3 WHERE v3.e = t2.d AND v3.i < 3;
d
w
w
w
w
w
w
d
d
d
d
d
d
d
d
d
d
d
d
e
e
e
e
e
e SET SESSION join_cache_level = @exit_join_cache_level; SET SESSION join_buffer_size = @exit_join_buffer_size;
DROP VIEW v3;
DROP TABLE t1,t2,t3,t4,t5;
#
# Bug #879882: right join within mergeable derived table
#
CREATE TABLE t1 (a varchar(1));
INSERT INTO t1 VALUES ('c'), ('a');
CREATE TABLE t2 (a int, b int, c varchar(1));
INSERT INTO t2 VALUES (29,8,'c'), (39,7,'b');
CREATE TABLE t3 (b int); SET @save_optimizer_switch=@@optimizer_switch; SET optimizer_switch='outer_join_with_cache=off';
EXPLAIN EXTENDED
SELECT t.b, t.c, t1.a
FROM t1, (SELECT t2.b, t2.c FROM t3 RIGHT JOIN t2 ON t2.a = t3.b) AS t
WHERE t.b AND t.c = t1.a;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t3 system NULL NULL NULL NULL 00.00 Const row not found 1 SIMPLE t1 ALL NULL NULL NULL NULL 2100.00 1 SIMPLE t2 ALL NULL NULL NULL NULL 2100.00 Using where; Using join buffer (flat, BNL join)
Warnings:
Note 1003 select `test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t2`.`c` = `test`.`t1`.`a` and `test`.`t2`.`b` <> 0
SELECT t.b, t.c, t1.a
FROM t1, (SELECT t2.b, t2.c FROM t3 RIGHT JOIN t2 ON t2.a = t3.b) AS t
WHERE t.b AND t.c = t1.a;
b c a 8 c c
EXPLAIN EXTENDED
SELECT t.b, t.c, t1.a
FROM t1, (SELECT t2.b, t2.c FROM t3 RIGHT JOIN t2 ON t2.a = t3.b) AS t
WHERE t.b <> 0AND t.c = t1.a;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t3 system NULL NULL NULL NULL 00.00 Const row not found 1 SIMPLE t1 ALL NULL NULL NULL NULL 2100.00 1 SIMPLE t2 ALL NULL NULL NULL NULL 2100.00 Using where; Using join buffer (flat, BNL join)
Warnings:
Note 1003 select `test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t2` where `test`.`t2`.`c` = `test`.`t1`.`a` and `test`.`t2`.`b` <> 0
SELECT t.b, t.c, t1.a
FROM t1, (SELECT t2.b, t2.c FROM t3 RIGHT JOIN t2 ON t2.a = t3.b) AS t
WHERE t.b <> 0AND t.c = t1.a;
b c a 8 c c
INSERT INTO t3 VALUES (100), (200);
EXPLAIN EXTENDED
SELECT t.b, t.c, t1.a
FROM t1, (SELECT t2.b, t2.c FROM t3 RIGHT JOIN t2 ON t2.a = t3.b) AS t
WHERE t.b AND t.c = t1.a;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2100.00 1 SIMPLE t2 ALL NULL NULL NULL NULL 2100.00 Using where; Using join buffer (flat, BNL join) 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t2` left join `test`.`t3` on(`test`.`t3`.`b` = `test`.`t2`.`a`) where `test`.`t2`.`c` = `test`.`t1`.`a` and `test`.`t2`.`b` <> 0
SELECT t.b, t.c, t1.a
FROM t1, (SELECT t2.b, t2.c FROM t3 RIGHT JOIN t2 ON t2.a = t3.b) AS t
WHERE t.b AND t.c = t1.a;
b c a 8 c c
EXPLAIN EXTENDED
SELECT t.b, t.c, t1.a
FROM t1, (SELECT t2.b, t2.c FROM t3 RIGHT JOIN t2 ON t2.a = t3.b) AS t
WHERE t.b <> 0AND t.c = t1.a;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2100.00 1 SIMPLE t2 ALL NULL NULL NULL NULL 2100.00 Using where; Using join buffer (flat, BNL join) 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t2` left join `test`.`t3` on(`test`.`t3`.`b` = `test`.`t2`.`a`) where `test`.`t2`.`c` = `test`.`t1`.`a` and `test`.`t2`.`b` <> 0
SELECT t.b, t.c, t1.a
FROM t1, (SELECT t2.b, t2.c FROM t3 RIGHT JOIN t2 ON t2.a = t3.b) AS t
WHERE t.b <> 0AND t.c = t1.a;
b c a 8 c c SET optimizer_switch=@save_optimizer_switch;
DROP TABLE t1,t2,t3;
#
# Bug #880724: materialized const view as inner table of outer join
#
CREATE TABLE t1 (a int, b varchar(1));
INSERT INTO t1 VALUES (9,NULL), (6,'r'), (7,'c');
CREATE TABLE t2 (a int);
INSERT INTO t2 VALUES (6);
CREATE ALGORITHM=TEMPTABLE VIEW v2 AS SELECT * FROM t2; SET @save_optimizer_switch=@@optimizer_switch; SET optimizer_switch='outer_join_with_cache=off'; SET SESSION optimizer_switch = 'derived_with_keys=on'; SET SESSION join_cache_level = 4;
EXPLAIN
SELECT t1.b,v2.a FROM t1 LEFT JOIN v2 ON v2.a = t1.a;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 1 Using where 2 DERIVED t2 system NULL NULL NULL NULL 1
SELECT t1.b,v2.a FROM t1 LEFT JOIN v2 ON v2.a = t1.a;
b a
NULL NULL
r 6
c NULL
CREATE TABLE t3 (a int, b varchar(1));
INSERT INTO t3 VALUES (8,'x'), (5,'r'), (9,'y');
EXPLAIN
SELECT * FROM t3
WHERE t3.b <> ANY (SELECT t1.b FROM t1 LEFT JOIN v2 ON v2.a = t1.a);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 Using where 2 DEPENDENT SUBQUERY <derived3> ALL NULL NULL NULL NULL 1 Using where 3 DERIVED t2 system NULL NULL NULL NULL 1
SELECT * FROM t3
WHERE t3.b <> ANY (SELECT t1.b FROM t1 LEFT JOIN v2 ON v2.a = t1.a);
a b 8 x 5 r 9 y SET SESSION join_cache_level = @exit_join_cache_level; SET optimizer_switch=@save_optimizer_switch;
DROP VIEW v2;
DROP TABLE t1,t2,t3;
#
# Bug #881449: OUTER JOIN usin a merged view within IN subquery
#
CREATE TABLE t1 (a varchar(1)) ;
INSERT INTO t1 VALUES ('y'), ('x');
CREATE TABLE t2 (a int, PRIMARY KEY (a)) ;
INSERT INTO t2 VALUES (1), (2);
CREATE TABLE t3 (a int, b varchar(1)) ;
INSERT INTO t3 VALUES (1,'x');
CREATE VIEW v3 AS SELECT * FROM t3; SET SESSION optimizer_switch='semijoin=on';
EXPLAIN
SELECT * FROM t1 WHERE a IN (SELECT v3.b FROM t2 RIGHT JOIN v3 ON v3.a = t2.a);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t3 system NULL NULL NULL NULL 1 1 PRIMARY t2 const PRIMARY PRIMARY 4 const 1 Using index 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM t1 WHERE a IN (SELECT v3.b FROM t2 RIGHT JOIN v3 ON v3.a = t2.a);
a
x set optimizer_switch= @save_optimizer_switch;
DROP VIEW v3;
DROP TABLE t1,t2,t3;
#
# Bug #874035: view as an inner table of a materialized derived
#
CREATE TABLE t2 (a int NOT NULL);
INSERT INTO t2 VALUES (7), (4);
CREATE TABLE t1 (b int NOT NULL);
INSERT INTO t1 VALUES (5), (7);
CREATE ALGORITHM=MERGE VIEW v1 AS SELECT * FROM t1; SET @save_optimizer_switch=@@optimizer_switch; SET SESSION optimizer_switch='derived_merge=off';
PREPARE st1 FROM 'SELECT * FROM (SELECT * FROM t2 LEFT JOIN v1 ON t2.a = v1.b) AS t';
EXECUTE st1;
a b 77 4 NULL
EXECUTE st1;
a b 77 4 NULL
DEALLOCATE PREPARE st1; set SESSION optimizer_switch= @save_optimizer_switch;
DROP VIEW v1;
DROP TABLE t1,t2;
#
# LP bug #879939: assertion in ha_maria::enable_indexes
# with derived_with_keys=on
#
CREATE TABLE t2 (a varchar(3));
INSERT INTO t2 VALUES ('USA'), ('USA'), ('USA'), ('USA'), ('USA');
CREATE TABLE t1 (a varchar(3), b varchar(35));
INSERT INTO t1 VALUES
('USA','Lansing'), ('USA','Laredo'), ('USA','Las Vegas'),
('USA','Lexington-Fayett'), ('USA','Lincoln'), ('USA','Little Rock'),
('USA','Livonia'), ('USA','Long Beach'), ('USA','Los Angeles'),
('USA','Louisville'), ('USA','Lowell'), ('USA','Lubbock'),
('USA','Macon'), ('USA','Madison'), ('USA','Manchester'),
('USA','McAllen'), ('USA','Memphis'), ('USA','Mesa'),
('USA','Mesquite'), ('USA','Metairie'), ('USA','Miami');
CREATE TABLE t3 (a varchar(35));
INSERT INTO t3 VALUES ('Miami'); SET @save_optimizer_switch=@@optimizer_switch; SET optimizer_switch = 'derived_with_keys=on'; SET @@tmp_table_size=1024*4;
Warnings:
Warning 1292 Truncated incorrect tmp_table_size value: '4096'
explain SELECT * FROM (SELECT t1.* FROM t1, t2) AS t JOIN t3 ON t3.a = t.b;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t3 system NULL NULL NULL NULL 1 1 SIMPLE t2 ALL NULL NULL NULL NULL 5 1 SIMPLE t1 ALL NULL NULL NULL NULL 21 Using where; Using join buffer (flat, BNL join)
SELECT * FROM (SELECT t1.* FROM t1, t2) AS t JOIN t3 ON t3.a = t.b;
a b a
USA Miami Miami
USA Miami Miami
USA Miami Miami
USA Miami Miami
USA Miami Miami SET @@tmp_table_size=1024*1024*16;
SELECT * FROM (SELECT t1.* FROM t1, t2) AS t JOIN t3 ON t3.a = t.b;
a b a
USA Miami Miami
USA Miami Miami
USA Miami Miami
USA Miami Miami
USA Miami Miami SET @@tmp_table_size=default; set SESSION optimizer_switch= @save_optimizer_switch;
drop table t1,t2,t3;
#
# BUG#882994: Crash in QUICK_RANGE_SELECT::reset with derived_with_keys
#
CREATE TABLE t2 (
pk varchar(33),
col_varchar_key varchar(3) NOT NULL,
col_varchar_nokey varchar(52) NOT NULL);
INSERT INTO t2 VALUES ('NICSpanish','NIC','Spanish'),
('NERHausa','NER','Hausa'),('NGAJoruba','NGA','Joruba'),
('NIUNiue','NIU','Niue'),('NFKEnglish','NFK','English'),
('NORNorwegian','NOR','Norwegian'),('CIVAkan','CIV','Akan'),
('OMNArabic','OMN','Arabic'),('PAKPunjabi','PAK','Punjabi'),
('PLWPalau','PLW','Palau'),('PANSpanish','PAN','Spanish'),
('PNGPapuan Langua','PNG','Papuan Languages'), ('PRYSpanish','PRY','Spanish'),
('PERSpanish','PER','Spanish'), ('PCNPitcairnese','PCN','Pitcairnese'),
('MNPPhilippene La','MNP','Philippene Langu'),('PRTPortuguese','PRT','Portuguese'),
('PRISpanish','PRI','Spanish'),('POLPolish','POL','Polish'),('GNQFang','GNQ','Fang');
CREATE TABLE t1 ( col_varchar_nokey varchar(52) NOT NULL ) ;
INSERT INTO t1 VALUES ('Chinese'),('English'),('French'),('German'),
('Italian'),('Japanese'),('Korean'),('Polish'),('Portuguese'),('Spanish'),
('Tagalog'),('Vietnamese');
CREATE TABLE t3 ( col_varchar_key varchar(52)) ;
INSERT INTO t3 VALUES ('United States'); set @tmp_882994= @@max_heap_table_size; set max_heap_table_size=1;
SELECT *
FROM t3 JOIN
( SELECT t2.* FROM t1, t2 ) AS alias2
ON ( alias2.col_varchar_nokey = t3.col_varchar_key )
ORDER BY CONCAT(alias2.col_varchar_nokey);
col_varchar_key pk col_varchar_key col_varchar_nokey set max_heap_table_size= @tmp_882994;
drop table t1,t2,t3;
#
# LP bug #917990: Bad estimate of #rows for derived table with LIMIT
#
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES
(8), (3), (4), (7), (9), (5), (1), (2);
SELECT * FROM (SELECT * FROM t1 LIMIT 3) t;
a 8 3 4
EXPLAIN
SELECT * FROM (SELECT * FROM t1 LIMIT 3) t;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 2 DERIVED t1 ALL NULL NULL NULL NULL 8
DROP TABLE t1;
#
# LP BUG#921878 incorrect check of items during columns union types
# aggregation for merged derived tables
# SET @save_optimizer_switch=@@optimizer_switch; SET SESSION optimizer_switch='derived_merge=on';
CREATE TABLE t1 ( a ENUM( 'x', 'y' ) );
insert into t1 values ('x');
CREATE TABLE t2 LIKE t1;
insert into t1 values ('y');
CREATE TABLE t3 LIKE t1;
INSERT INTO t3
SELECT * FROM ( SELECT * FROM t1 ) AS A
UNION SELECT * FROM t2;
select * from t3;
a
x
y
drop table t1,t2,t3; set SESSION optimizer_switch= @save_optimizer_switch;
#
# LP BUG#944782: derived table from an information schema table
# SET @save_optimizer_switch=@@optimizer_switch; SET SESSION optimizer_switch='derived_merge=on'; SET SESSION optimizer_switch='derived_with_keys=on';
CREATE TABLE t1 (c1 int PRIMARY KEY, c2 char(5));
EXPLAIN
SELECT COUNT(*) > 0
FROM INFORMATION_SCHEMA.COLUMNS
INNER JOIN
(SELECT TABLE_SCHEMA,
GROUP_CONCAT(COLUMN_NAME ORDER BY SEQ_IN_INDEX ASC) AS COL_NAMES
FROM INFORMATION_SCHEMA.STATISTICS
GROUP BY TABLE_SCHEMA) AS UNIQUES
ON ( COLUMNS.TABLE_SCHEMA = UNIQUES.TABLE_SCHEMA);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY COLUMNS ALL NULL NULL NULL NULL NULL Open_frm_only; Scanned all databases 1 PRIMARY <derived2> ref key0 key0 194 information_schema.COLUMNS.TABLE_SCHEMA 1 2 DERIVED STATISTICS ALL NULL NULL NULL NULL NULL Open_frm_only; Scanned all databases; Using filesort
SELECT COUNT(*) > 0
FROM INFORMATION_SCHEMA.COLUMNS
INNER JOIN
(SELECT TABLE_SCHEMA,
GROUP_CONCAT(COLUMN_NAME ORDER BY SEQ_IN_INDEX ASC) AS COL_NAMES
FROM INFORMATION_SCHEMA.STATISTICS
GROUP BY TABLE_SCHEMA) AS UNIQUES
ON ( COLUMNS.TABLE_SCHEMA = UNIQUES.TABLE_SCHEMA);
COUNT(*) > 0 1
Warnings:
Warning 1286 Unknown storage engine 'InnoDB'
Warning 1286 Unknown storage engine 'InnoDB'
Warning 1286 Unknown storage engine 'InnoDB'
Warning 1286 Unknown storage engine 'InnoDB'
Warning 1286 Unknown storage engine 'InnoDB'
Warning 1286 Unknown storage engine 'InnoDB'
DROP TABLE t1; SET SESSION optimizer_switch= @save_optimizer_switch;
#
# LP BUG#953649: crash when estimating the cost of a look-up
# into a derived table to be materialized
#
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (132);
CREATE TABLE t2 (b int, c varchar(256));
INSERT INTO t2 VALUES (132,'test1'), (120,'text2'), (132,'text3');
CREATE VIEW v AS
SELECT b, GROUP_CONCAT(c) AS gc FROM t2 GROUP BY b; SET @save_optimizer_switch=@@optimizer_switch; SET SESSION optimizer_switch='derived_merge=off'; SET SESSION optimizer_switch='derived_with_keys=off';
EXPLAIN
SELECT * FROM t1, v WHERE a = b;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 Using where 2 DERIVED t2 ALL NULL NULL NULL NULL 3 Using filesort
SELECT * FROM t1, v WHERE a = b;
a b gc 132132 test1,text3 SET SESSION optimizer_switch='derived_merge=on'; SET SESSION optimizer_switch='derived_with_keys=on';
EXPLAIN
SELECT * FROM t1, v WHERE a = b;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 1 PRIMARY <derived2> ref key0 key0 5 const 0 2 DERIVED t2 ALL NULL NULL NULL NULL 3 Using filesort
SELECT * FROM t1, v WHERE a = b;
a b gc 132132 test1,text3 SET SESSION optimizer_switch= @save_optimizer_switch;
DROP VIEW v;
DROP TABLE t1,t2;
#
# LP BUG#968720 crash due to converting to materialized and
# natural join made only once
# SET @save968720_optimizer_switch=@@optimizer_switch; SET optimizer_switch = 'derived_merge=on';
CREATE TABLE t1 (a int, INDEX(a));
INSERT INTO t1 VALUES (1);
CREATE TABLE t2 (a int, INDEX(a));
INSERT INTO t2 VALUES (1), (2);
INSERT INTO t1 SELECT a FROM (SELECT a FROM test.t1) AS s1 NATURAL JOIN
t2 AS s2;
INSERT INTO t1 SELECT a FROM (SELECT a FROM test.t1) AS s1 NATURAL JOIN
t2 AS s2;
SELECT * FROM t1;
a 1 1 1 1
DELETE FROM t1;
INSERT INTO t1 VALUES (1);
PREPARE stmt FROM "
INSERT INTO t1 SELECT a FROM (SELECT a FROM test.t1) AS s1 NATURAL JOIN
t2 AS s2; ";
EXECUTE stmt;
SELECT * FROM t1;
a 1 1
EXECUTE stmt;
SELECT * FROM t1;
a 1 1 1 1
drop table t1,t2; set optimizer_switch=@save968720_optimizer_switch;
#
# LP BUG#978847 Server crashes in Item_ref::real_item on
# INSERT .. SELECT with FROM subquery and derived_merge=ON SET @save978847_optimizer_switch=@@optimizer_switch; SET optimizer_switch = 'derived_merge=on';
CREATE TABLE t1 ( a INT, b INT );
INSERT INTO t1 VALUES (2,1),(3,2);
select * from t1;
a b 21 32
INSERT INTO t1 SELECT * FROM
( SELECT * FROM t1 ) AS alias;
select * from t1;
a b 21 32 21 32
prepare stmt1 from 'INSERT INTO t1 SELECT SQL_BIG_RESULT * FROM
( SELECT * FROM t1 ) AS alias';
execute stmt1;
select * from t1;
a b 21 32 21 32 21 32 21 32
execute stmt1;
select * from t1;
a b 21 32 21 32 21 32 21 32 21 32 21 32 21 32 21 32
drop table t1; set optimizer_switch=@save978847_optimizer_switch;
#
# LP bug998516 Server hangs on INSERT .. SELECT with derived_merge,
# FROM subquery, UNION
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (3),(4);
INSERT INTO t1 SELECT * FROM ( SELECT * FROM t1 ) AS alias UNION SELECT * FROM t2;
select * from t1;
a 1 2 1 2 3 4
drop table t1,t2;
#
# MDEV-3873: Wrong result (extra rows) with NOT IN and
# a subquery from a MERGE view
#
CREATE TABLE t1 (a INT NOT NULL) ENGINE=MyISAM;
INSERT INTO t1 VALUES (4),(7),(0);
CREATE TABLE t2 (b INT NOT NULL) ENGINE=MyISAM;
INSERT INTO t2 VALUES (1),(2);
CREATE TABLE t3 (c INT NOT NULL) ENGINE=MyISAM;
INSERT INTO t3 VALUES (4),(6),(3);
CREATE TABLE t4 (d INT NOT NULL) ENGINE=MyISAM;
INSERT INTO t4 VALUES (4),(5),(3);
CREATE TABLE tv (e INT NOT NULL) ENGINE=MyISAM;
INSERT INTO tv VALUES (1),(3);
CREATE ALGORITHM=TEMPTABLE VIEW v_temptable AS SELECT * FROM tv;
CREATE ALGORITHM=MERGE VIEW v_merge AS SELECT * FROM tv;
SELECT * FROM t1, t2
WHERE a NOT IN ( SELECT e FROM t3 LEFT JOIN v_temptable ON (c = e) WHERE c <> b ) AND a < b;
a b
SELECT * FROM t1, t2
WHERE a NOT IN ( SELECT e FROM t3 LEFT JOIN v_merge ON (c = e) WHERE c <> b ) AND a < b;
a b
SELECT * FROM t1, t2
WHERE a NOT IN ( SELECT e FROM t3 LEFT JOIN (SELECT * FROM tv) as derived ON (c = e) WHERE c <> b ) AND a < b;
a b
drop view v_temptable, v_merge;
drop table t1,t2,t3,t4,tv;
#
# MDEV-3912: Wrong result (extra rows) with FROM subquery inside
# ALL subquery, LEFT JOIN, derived_merge.
# (duplicate of MDEV-3873 (above))
# SET @save3912_optimizer_switch=@@optimizer_switch; SET optimizer_switch = 'derived_merge=on,in_to_exists=on';
CREATE TABLE t1 (a INT) ENGINE=MyISAM;
INSERT INTO t1 VALUES (4),(8);
CREATE TABLE t2 (b INT) ENGINE=MyISAM;
INSERT INTO t2 VALUES (7),(0);
CREATE TABLE t3 (c INT, d INT NOT NULL) ENGINE=MyISAM;
INSERT INTO t3 VALUES (0,4),(8,6);
SELECT * FROM t1
WHERE a >= ALL (
SELECT d FROM t2 LEFT JOIN ( SELECT * FROM t3 ) AS alias ON ( c = b )
WHERE b >= a
);
a 8 set optimizer_switch=@save3912_optimizer_switch;
drop table t1, t2, t3;
#
# MDEV-4209: equi-join on BLOB column from materialized view
# or derived table
# set @save_optimizer_switch=@@optimizer_switch; set optimizer_switch='derived_with_keys=on';
CREATE TABLE t1 (c1 text, c2 int);
INSERT INTO t1 VALUES ('a',1), ('c',3), ('g',7), ('d',4), ('c',3);
CREATE TABLE t2 (c1 text, c2 int);
INSERT INTO t2 VALUES ('b',2), ('c',3);
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
EXPLAIN EXTENDED
SELECT v1.c1, v1.c2 FROM v1, t2 WHERE v1.c1=t2.c1 AND v1.c2=t2.c2;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2100.00 Using where 1 PRIMARY <derived2> ref key0 key0 5 test.t2.c2 1100.00 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 5100.00
Warnings:
Note 1003/* select#1 */ select `v1`.`c1` AS `c1`,`v1`.`c2` AS `c2` from `test`.`v1` join `test`.`t2` where `v1`.`c1` = `test`.`t2`.`c1` and `v1`.`c2` = `test`.`t2`.`c2`
SELECT v1.c1, v1.c2 FROM v1, t2 WHERE v1.c1=t2.c1 AND v1.c2=t2.c2;
c1 c2
c 3
c 3
EXPLAIN EXTENDED
SELECT t2.c1, t2.c2 FROM (SELECT c1 g, MAX(c2) m FROM t1 GROUP BY c1) t, t2
WHERE t.g=t2.c1 AND t.m=t2.c2;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2100.00 Using where 1 PRIMARY <derived2> ref key0 key0 5 test.t2.c2 1100.00 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 5100.00 Using temporary; Using filesort
Warnings:
Note 1003/* select#1 */ select `test`.`t2`.`c1` AS `c1`,`test`.`t2`.`c2` AS `c2` from (/* select#2 */ select `test`.`t1`.`c1` AS `g`,max(`test`.`t1`.`c2`) AS `m` from `test`.`t1` group by `test`.`t1`.`c1`) `t` join `test`.`t2` where `t`.`g` = `test`.`t2`.`c1` and `t`.`m` = `test`.`t2`.`c2`
SELECT t2.c1, t2.c2 FROM (SELECT c1 g, MAX(c2) m FROM t1 GROUP BY c1) t, t2
WHERE t.g=t2.c1 AND t.m=t2.c2;
c1 c2
c 3
EXPLAIN EXTENDED
SELECT v1.c1, v1.c2, t2.c1, t2.c2 FROM v1, t2 WHERE v1.c1=t2.c1;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2100.00 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 5100.00 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 5100.00
Warnings:
Note 1003/* select#1 */ select `v1`.`c1` AS `c1`,`v1`.`c2` AS `c2`,`test`.`t2`.`c1` AS `c1`,`test`.`t2`.`c2` AS `c2` from `test`.`v1` join `test`.`t2` where `v1`.`c1` = `test`.`t2`.`c1`
SELECT v1.c1, v1.c2, t2.c1, t2.c2 FROM v1, t2 WHERE v1.c1=t2.c1;
c1 c2 c1 c2
c 3 c 3
c 3 c 3
DROP VIEW v1;
DROP TABLE t1,t2; set optimizer_switch=@save_optimizer_switch;
#
# mdev-5078: sum over a view/derived table
#
CREATE TABLE t1 (a int);
INSERT INTO t1 (a) VALUES (1), (2);
CREATE TABLE t2 (b int(11));
INSERT INTO t2 (b) VALUES (1), (2);
CREATE VIEW v AS SELECT b as c FROM t2;
SELECT a, (SELECT SUM(a + c) FROM v) FROM t1;
a (SELECT SUM(a + c) FROM v) 15 27
SELECT a, (SELECT SUM(a + c) FROM (SELECT b as c FROM t2) AS v1) FROM t1;
a (SELECT SUM(a + c) FROM (SELECT b as c FROM t2) AS v1) 15 27
DROP VIEW v;
DROP TABLE t1,t2;
#
# mdev-5105: memory overwrite in multi-table update
# using natural join with a view
#
create table t1(a int,b tinyint,c tinyint)engine=myisam;
create table t2(a tinyint,b float,c int, d int, e int, f int, key (b), key(c), key(d), key(e), key(f))engine=myisam;
create table t3(a int,b int,c int, d int, e int, f int, key(a), key(b), key(c), key(d), key(e), key(f))engine=myisam;
create view v1 as select t2.b a, t1.b b, t2.c c, t2.d d, t2.e e, t2.f f from t1,t2 where t1.a=t2.a;
update t3 natural join v1 set a:=1;
drop view v1;
drop table t1,t2,t3;
#
# mdev-5288: assertion failure for query over a view with ORDER BY
#
CREATE TABLE t1 (a int, b int) ENGINE=MyISAM;
INSERT INTO t1 VALUES (4,1);
CREATE ALGORITHM=MERGE VIEW v1 AS SELECT * FROM t1;
EXPLAIN EXTENDED SELECT a FROM v1 WHERE a > 100 ORDER BY b;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1003 select 4 AS `a` from dual where 0 order by 1
DROP VIEW v1;
DROP TABLE t1;
CREATE TABLE IFNOT EXISTS `galleries` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(100) NOT NULL,
`year` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `name` (`name`)
) DEFAULT CHARSET=utf8;
CREATE TABLE IFNOT EXISTS `pictures` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(100) NOT NULL,
`width` float DEFAULT NULL,
`height` float DEFAULT NULL,
`year` int(4) DEFAULT NULL,
`technique` varchar(50) DEFAULT NULL,
`comment` varchar(2000) DEFAULT NULL,
`gallery_id` int(11) NOT NULL,
`type` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `gallery_id` (`gallery_id`)
) DEFAULT CHARSET=utf8 ;
ALTER TABLE `pictures`
ADD CONSTRAINT `pictures_ibfk_1` FOREIGN KEY (`gallery_id`) REFERENCES `galleries` (`id`);
INSERT INTO `galleries` (`id`, `name`, `year`) VALUES
(1, 'Quand le noir et blanc invite le taupe', 2013),
(2, 'Une touche de couleur', 2012),
(3, 'Éclats', 2011),
(4, 'Gris béton', 2010),
(5, 'Expression du spalter', 2010),
(6, 'Zénitude', 2009),
(7, 'La force du rouge', 2008),
(8, 'Sphères', NULL),
(9, 'Centre', 2009),
(10, 'Nébuleuse', NULL);
INSERT INTO `pictures` (`id`, `name`, `width`, `height`, `year`, `technique`, `comment`, `gallery_id`, `type`) VALUES
(1, 'Éclaircie', 72.5, 100, NULL, NULL, NULL, 1, 1),
(2, 'Architecture', 81, 100, NULL, NULL, NULL, 1, 1),
(3, 'Nouveau souffle', 72.5, 100, NULL, NULL, NULL, 1, 1),
(4, 'Échanges (2)', 89, 116, NULL, NULL, NULL, 1, 1),
(5, 'Échanges', 89, 116, NULL, NULL, NULL, 1, 1),
(6, 'Fenêtre de vie', 81, 116, NULL, NULL, NULL, 1, 1),
(7, 'Architecture', 81, 100, NULL, NULL, NULL, 1, 1),
(8, 'Nouveau souffle (2)', 72.5, 100, NULL, NULL, NULL, 1, 1),
(9, 'Fluidité', 89, 116, NULL, NULL, NULL, 1, 1),
(10, 'Nouveau Monde', 89, 125, NULL, NULL, NULL, 1, 1),
(11, 'Mirage', 73, 100, NULL, NULL, NULL, 1, 1),
(12, 'Équilibre', 72.5, 116, NULL, NULL, NULL, 2, 1),
(13, 'Fusion', 72.5, 116, NULL, NULL, NULL, 2, 1),
(14, 'Étincelles', NULL, NULL, NULL, NULL, NULL, 3, 1),
(15, 'Régénérescence', NULL, NULL, NULL, NULL, NULL, 3, 1),
(16, 'Chaleur', 80, 80, NULL, NULL, NULL, 4, 1),
(17, 'Création', 90, 90, NULL, NULL, NULL, 4, 1),
(18, 'Horizon', 92, 73, NULL, NULL, NULL, 4, 1),
(19, 'Labyrinthe', 81, 100, NULL, NULL, NULL, 4, 1),
(20, 'Miroir', 80, 116, NULL, NULL, NULL, 5, 1),
(21, 'Libération', 81, 116, NULL, NULL, NULL, 5, 1),
(22, 'Éclats', 81, 116, NULL, NULL, NULL, 5, 1),
(23, 'Zénitude', 116, 89, NULL, NULL, NULL, 6, 1),
(24, 'Écritures lointaines', 90, 90, NULL, NULL, NULL, 7, 1),
(25, 'Émergence', 80, 80, NULL, NULL, NULL, 7, 1),
(26, 'Liberté', 50, 50, NULL, NULL, NULL, 7, 1),
(27, 'Silhouettes amérindiennes', 701, 70, NULL, NULL, NULL, 7, 1),
(28, 'Puissance', 81, 100, NULL, NULL, NULL, 8, 1),
(29, 'Source', 73, 116, NULL, NULL, NULL, 8, 1),
(30, 'Comme une ville qui prend vie', 50, 100, 2008, NULL, NULL, 9, 1),
(31, 'Suspension azur', 80, 80, NULL, NULL, NULL, 9, 1),
(32, 'Nébuleuse', 70, 70, NULL, NULL, NULL, 10, 1),
(33, 'Œuvre commandée 120 P', 114, 195, NULL, NULL, NULL, 1, 2),
(34, 'Œuvre commandée 120 P', 114, 195, NULL, NULL, NULL, 1, 2),
(35, 'Œuvre commandée 120 P', 114, 195, NULL, NULL, NULL, 1, 2),
(36, 'Œuvre commandée 120 P', 114, 195, NULL, NULL, NULL, 1, 2),
(37, 'Œuvre commandée 120 P', 114, 195, NULL, NULL, NULL, 1, 2),
(38, 'Œuvre commandée 120 P', 114, 195, NULL, NULL, NULL, 1, 2);
explain
SELECT g.id AS gallery_id,
g.name AS gallery_name,
p.id AS picture_id,
p.name AS picture_name,
g.p_random AS r1,
g.p_random AS r2,
g.p_random AS r3
FROM
(
SELECT gal.id,
gal.name,
(
SELECT pi.id
FROM pictures pi
WHERE pi.gallery_id = gal.id
ORDER BY RAND()
LIMIT 1
) AS p_random
FROM galleries gal
) g
LEFT JOIN pictures p
ON p.id = g.p_random
ORDER BY gallery_name ASC ;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 10 Using filesort 1 PRIMARY p eq_ref PRIMARY PRIMARY 4 g.p_random 1 Using where 2 DERIVED gal ALL NULL NULL NULL NULL 10 3 DEPENDENT SUBQUERY pi ref gallery_id gallery_id 4 test.gal.id 4 Using temporary; Using filesort
drop table galleries, pictures;
#
# MDEV-5740: Assertion
#`!derived->first_select()->exclude_from_table_unique_test ||
#derived->outer_select()-> exclude_from_table_unique_test'
#failed on 2nd execution of PS with derived_merge
# set @save_optimizer_switch5740=@@optimizer_switch; SET optimizer_switch = 'derived_merge=on';
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (3),(4);
PREPARE stmt FROM '
INSERT INTO t1 SELECT * FROM t2 UNION SELECT * FROM (SELECT * FROM t1) AS sq ';
EXECUTE stmt;
select * from t1;
a 1 2 3 4 1 2
EXECUTE stmt;
select * from t1;
a 1 2 3 4 1 2 3 4 1 2
deallocate prepare stmt;
drop table t1,t2; set optimizer_switch=@save_optimizer_switch5740;
#
# Bug mdev-5721: possible long key access to a materialized derived table
# (see also the test case for Bug#13261277 that is actually the same bug)
#
CREATE TABLE t1 (
id varchar(255) NOT NULL DEFAULT '',
familyid int(11) DEFAULT NULL,
withdrawndate date DEFAULT NULL,
KEY index_td_familyid_id (familyid,id)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb3;
CREATE TABLE t2 (
id int(11) NOT NULL AUTO_INCREMENT,
activefromts datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
shortdescription text,
useraccessfamily varchar(512) DEFAULT NULL,
serialized longtext,
PRIMARY KEY (id)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
insert into t1 values ('picture/89/1369722032695.pmd',89,NULL);
insert into t1 values ('picture/90/1369832057370.pmd',90,NULL);
insert into t2 values (38,'2013-03-04 07:49:22','desc','CODE','string');
EXPLAIN
SELECT * FROM t2 x,
(SELECT t2.useraccessfamily, t2.serialized AS picturesubuser, COUNT(*)
FROM t2, t1 GROUP BY t2.useraccessfamily, picturesubuser) y
WHERE x.useraccessfamily = y.useraccessfamily;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY x system NULL NULL NULL NULL 1 1 PRIMARY <derived2> ref key0 key0 2051 const 0 2 DERIVED t2 system NULL NULL NULL NULL 1 2 DERIVED t1 index NULL index_td_familyid_id 772 NULL 2 Using index
SELECT * FROM t2 x,
(SELECT t2.useraccessfamily, t2.serialized AS picturesubuser, COUNT(*)
FROM t2, t1 GROUP BY t2.useraccessfamily, picturesubuser) y
WHERE x.useraccessfamily = y.useraccessfamily;
id activefromts shortdescription useraccessfamily serialized useraccessfamily picturesubuser COUNT(*) 382013-03-0407:49:22 desc CODE string CODE string 2
DROP TABLE t1,t2;
#
# Bug#13261277: Unchecked key length caused missing records.
#
CREATE TABLE t1 (
col_varchar varchar(1024) CHARACTER SET utf8 DEFAULT NULL,
stub1 varchar(1024) CHARACTER SET utf8 DEFAULT NULL,
stub2 varchar(1024) CHARACTER SET utf8 DEFAULT NULL,
stub3 varchar(1024) CHARACTER SET utf8 DEFAULT NULL
);
INSERT INTO t1 VALUES
('d','d','l','ther'),
(NULL,'s','NJBIQ','trzetuchv'),
(-715390976,'coul','MYWFB','cfhtrzetu'),
(1696792576,'f','i\'s','c'),
(1,'i','ltpemcfhtr','gsltpemcf'),
(-663027712,'mgsltpemcf','sa','amgsltpem'),
(-1686700032,'JPRVK','i','vamgsltpe'),
(NULL,'STUNB','UNVJV','u'),
(5,'oka','qyihvamgsl','AXSMD'),
(NULL,'tqwmqyihva','h','yntqwmqyi'),
(3,'EGMJN','e','e');
CREATE TABLE t2 (
col_varchar varchar(10) DEFAULT NULL,
col_int INT DEFAULT NULL
);
INSERT INTO t2 VALUES ('d',9); set optimizer_switch='derived_merge=off,derived_with_keys=on'; SET @save_heap_size= @@max_heap_table_size; SET @@max_heap_table_size= 16384;
SELECT t2.col_int
FROM t2
RIGHT JOIN ( SELECT * FROM t1 ) AS dt
ON t2.col_varchar = dt.col_varchar
WHERE t2.col_int IS NOT NULL ;
col_int 9
# Shouldn't use auto_key0 for derived table
EXPLAIN
SELECT t2.col_int
FROM t2
RIGHT JOIN ( SELECT * FROM t1 ) AS dt
ON t2.col_varchar = dt.col_varchar
WHERE t2.col_int IS NOT NULL ;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 11 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 11 SET @@max_heap_table_size= @save_heap_size; SET optimizer_switch=@save_optimizer_switch;
DROP TABLE t1,t2;
#
# end of 5.3 tests
#
#
# Bug mdev-11161: The second execution of prepared statement
# does not use generated key for materialized
# derived table / view
# (actually this is a 5.3 bug.)
#
create table t1 (
mat_id MEDIUMINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
matintnum CHAR(6) NOT NULL,
test MEDIUMINT UNSIGNED NULL
) CHARSET=latin1;
create table t2 (
mat_id MEDIUMINT UNSIGNED NOT NULL,
pla_id MEDIUMINT UNSIGNED NOT NULL
) CHARSET=latin1;
insert into t1 values
(NULL, 'a', 1), (NULL, 'b', 2), (NULL, 'c', 3), (NULL, 'd', 4),
(NULL, 'e', 5), (NULL, 'f', 6), (NULL, 'g', 7), (NULL, 'h', 8),
(NULL, 'i', 9);
insert into t2 values
(1, 100), (1, 101), (1, 102), (2, 100), (2, 103), (2, 104),
(3, 101), (3, 102), (3, 105);
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> ref key0 key0 7 test.m2.matintnum 1 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
prepare stmt1 from "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";
flush status;
execute stmt1;
pla_id mat_id 1021 1011 1001 1042 1032 1053
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 21
Handler_read_last 0
Handler_read_next 6
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 6
Handler_read_rnd_deleted 0
Handler_read_rnd_next 27
flush status;
execute stmt1;
pla_id mat_id 1021 1011 1001 1042 1032 1053
show status like '%Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 21
Handler_read_last 0
Handler_read_next 6
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 6
Handler_read_rnd_deleted 0
Handler_read_rnd_next 27
deallocate prepare stmt1;
drop table t1,t2;
#
# Bug mdev-12670: mergeable derived / view with subqueries
# subject to semi-join optimizations
# (actually this is a 5.3 bug.)
#
create table t1 (a int) engine=myisam;
insert into t1 values (5),(3),(2),(7),(2),(5),(1);
create table t2 (b int, index idx(b)) engine=myisam;
insert into t2 values (2),(3),(2),(1),(3),(4);
insert into t2 select b+10 from t2;
insert into t2 select b+10 from t2;
insert into t2 select b+10 from t2;
insert into t2 select b+10 from t2;
insert into t2 select b+10 from t2;
insert into t2 select b+10 from t2;
insert into t2 select b+10 from t2;
insert into t2 select b+10 from t2;
insert into t2 select b+10 from t2;
insert into t2 select b+10 from t2;
analyze table t1,t2;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
test.t2 analyze status Engine-independent statistics collected
test.t2 analyze status OK
explain select a from t1 where a in (select b from t2);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 7 Using where 1 PRIMARY t2 ref idx idx 5 test.t1.a 139 Using index; FirstMatch(t1)
explain select * from (select a from t1 where a in (select b from t2)) t;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 7 Using where 1 PRIMARY t2 ref idx idx 5 test.t1.a 139 Using index; FirstMatch(t1)
create view v1 as select a from t1 where a in (select b from t2);
explain select * from v1;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 7 Using where 1 PRIMARY t2 ref idx idx 5 test.t1.a 139 Using index; FirstMatch(t1)
drop view v1;
drop table t1,t2;
#
# Bug mdev-12812: mergeable derived / view with subqueries
# NOT subject to semi-join optimizations
#
CREATE TABLE t1 (c1 varchar(3)) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('foo'),('foo');
CREATE TABLE t2 (c2 varchar(3)) ENGINE=MyISAM;
INSERT INTO t2 VALUES ('bar'),('qux'),('foo');
SELECT STRAIGHT_JOIN *
FROM ( SELECT * FROM t1 WHERE c1 IN ( SELECT c2 FROM t2 ) ) AS sq;
c1
foo
foo
EXPLAIN EXTENDED SELECT STRAIGHT_JOIN *
FROM ( SELECT * FROM t1 WHERE c1 IN ( SELECT c2 FROM t2 ) ) AS sq;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2100.00 Using where 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 3100.00 Using where
Warnings:
Note 1003/* select#1 */ select straight_join `test`.`t1`.`c1` AS `c1` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`c1`,<exists>(/* select#3 */ select `test`.`t2`.`c2` from `test`.`t2` where <cache>(`test`.`t1`.`c1`) = `test`.`t2`.`c2`))
DROP TABLE t1, t2;
#
# Bug mdev-16420: materialized view that renames columns
# in inner part of outer join
#
CREATE TABLE t1 (id int, PRIMARY KEY (id));
INSERT INTO t1 VALUES (2), (3), (7), (1);
CREATE VIEW v1 AS SELECT * FROM t1;
CREATE VIEW v2 AS SELECT v1.id AS order_pk FROM v1 GROUP BY v1.id;
CREATE VIEW v3 AS
SELECT t.id AS order_pk FROM (SELECT * FROM t1) AS t GROUP BY t.id;
SELECT * FROM t1 LEFT JOIN v2 ON t1.id=v2.order_pk;
id order_pk 11 22 33 77
EXPLAIN EXTENDED
SELECT * FROM t1 LEFT JOIN v2 ON t1.id=v2.order_pk;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL PRIMARY 4 NULL 4100.00 Using index 1 PRIMARY <derived2> ref key0 key0 5 test.t1.id 1100.00 2 LATERAL DERIVED t1 eq_ref PRIMARY PRIMARY 4 test.t1.id 1100.00 Using where; Using index
Warnings:
Note 1003/* select#1 */ select `test`.`t1`.`id` AS `id`,`v2`.`order_pk` AS `order_pk` from `test`.`t1` left join `test`.`v2` on(`v2`.`order_pk` = `test`.`t1`.`id`) where 1
SELECT * FROM t1 LEFT JOIN v3 ON t1.id=v3.order_pk;
id order_pk 11 22 33 77
EXPLAIN EXTENDED
SELECT * FROM t1 LEFT JOIN v3 ON t1.id=v3.order_pk;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 index NULL PRIMARY 4 NULL 4100.00 Using index 1 PRIMARY <derived2> ref key0 key0 5 test.t1.id 1100.00 2 LATERAL DERIVED t1 eq_ref PRIMARY PRIMARY 4 test.t1.id 1100.00 Using where; Using index
Warnings:
Note 1003/* select#1 */ select `test`.`t1`.`id` AS `id`,`v3`.`order_pk` AS `order_pk` from `test`.`t1` left join `test`.`v3` on(`v3`.`order_pk` = `test`.`t1`.`id`) where 1
DROP VIEW v1,v2,v3;
DROP TABLE t1; set optimizer_switch=@exit_optimizer_switch; set join_cache_level=@exit_join_cache_level;
#
# Bug mdev-18479: EXPLAIN for query with many expensive derived
#
CREATE TABLE t1
(id int auto_increment primary key,
uid int NOT NULL,
gp_id int NOT NULL,
r int NOT NULL
);
INSERT INTO t1(uid,gp_id,r) VALUES
(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),
(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),
(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),
(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),
(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),(1,1,1),
(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),
(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),
(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),
(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),
(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),(1,2,1),
(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),
(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),
(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),
(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),
(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),(1,3,1),
(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),
(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),
(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),
(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),
(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),(1,4,1),
(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),
(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),
(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),
(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),
(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),(1,5,1),
(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),
(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),
(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),
(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),
(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),(1,6,1),
(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),
(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),
(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),
(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),
(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),(1,7,1),
(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),
(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),
(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),
(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),
(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),(1,8,1),
(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),
(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),
(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),
(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),
(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),(1,9,1),
(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),
(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),
(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),
(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),
(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),
(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,10,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),
(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),
(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),
(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),
(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),
(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),(1,11,1),
(1,11,1);
CREATE TABLE t2 (id int) ;
INSERT INTO t2 VALUES (1);
explain SELECT 1 FROM t2 JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_1 ON gp_1.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_2 ON gp_2.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p1 ON p1.r=1AND p1.uid=t2.id
JOIN t1 p3 ON p3.r=3AND p3.uid=t2.id
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_3 ON gp_3.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p1 ON p1.r=1AND p1.uid=t2.id
JOIN t1 p3 ON p3.r=3AND p3.uid=t2.id
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_4 ON gp_4.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p1 ON p1.r=1AND p1.uid=t2.id
JOIN t1 p3 ON p3.r=3AND p3.uid=t2.id
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_5 ON gp_5.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p1 ON p1.r=1AND p1.uid=t2.id
JOIN t1 p3 ON p3.r=3AND p3.uid=t2.id
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_6 ON gp_6.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p1 ON p1.r=1AND p1.uid=t2.id
JOIN t1 p3 ON p3.r=3AND p3.uid=t2.id
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
WHERE p1.gp_id=7) gp_7 ON gp_7.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_8 ON gp_8.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_9 ON gp_9.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_14 ON gp_14.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_15 ON gp_15.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
) gp_16 ON gp_16.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
)gp_17 ON gp_17.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
)gp_18 ON gp_18.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
JOIN t1 p9 ON p9.r=9AND p9.uid=t2.id
JOIN t1 p10 ON p10.r=10AND p10.uid=t2.id
)gp_19 ON gp_19.id=t2.id
JOIN
(SELECT t2.id
FROM t2
JOIN t1 p4 ON p4.r=4AND p4.uid=t2.id
JOIN t1 p5 ON p5.r=5AND p5.uid=t2.id
JOIN t1 p6 ON p6.r=6AND p6.uid=t2.id
JOIN t1 p7 ON p7.r=7AND p7.uid=t2.id
JOIN t1 p8 ON p8.r=8AND p8.uid=t2.id
) gp_20 ON gp_20.id=t2.id ;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY t2 system NULL NULL NULL NULL 1 1 PRIMARY p4 ALL NULL NULL NULL NULL 550 Using where 1 PRIMARY p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 1 PRIMARY p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p4 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p1 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p3 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p4 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p1 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p3 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p4 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p1 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p3 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p4 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived17> ALL NULL NULL NULL NULL 50328437500000 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived14> ALL NULL NULL NULL NULL 27680640625000000 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived9> ALL NULL NULL NULL NULL 15224352343750000640 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived10> ALL NULL NULL NULL NULL 15224352343750000640 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived11> ALL NULL NULL NULL NULL 15224352343750000640 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived12> ALL NULL NULL NULL NULL 15224352343750000640 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived13> ALL NULL NULL NULL NULL 15224352343750000640 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived15> ALL NULL NULL NULL NULL 15224352343750000640 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived16> ALL NULL NULL NULL NULL 15224352343750000640 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived7> ALL NULL NULL NULL NULL 18446744073709551615 Using where; Using join buffer (incremental, BNL join) 1 PRIMARY <derived8> ALL NULL NULL NULL NULL 18446744073709551615 Using where; Using join buffer (incremental, BNL join) 17 DERIVED t2 system NULL NULL NULL NULL 1 17 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where 17 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 17 DERIVED p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 17 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 17 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 16 DERIVED t2 system NULL NULL NULL NULL 1 16 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where 16 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 16 DERIVED p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 16 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 16 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 16 DERIVED p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 16 DERIVED p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 15 DERIVED t2 system NULL NULL NULL NULL 1 15 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where 15 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 15 DERIVED p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 15 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 15 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 15 DERIVED p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 15 DERIVED p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 14 DERIVED t2 system NULL NULL NULL NULL 1 14 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where 14 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 14 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 14 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 14 DERIVED p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 14 DERIVED p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 13 DERIVED t2 system NULL NULL NULL NULL 1 13 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where 13 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 13 DERIVED p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 13 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 13 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 13 DERIVED p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 13 DERIVED p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 12 DERIVED t2 system NULL NULL NULL NULL 1 12 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where 12 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 12 DERIVED p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 12 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 12 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 12 DERIVED p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 12 DERIVED p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 11 DERIVED t2 system NULL NULL NULL NULL 1 11 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where 11 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 11 DERIVED p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 11 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 11 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 11 DERIVED p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 11 DERIVED p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 10 DERIVED t2 system NULL NULL NULL NULL 1 10 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where 10 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 10 DERIVED p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 10 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 10 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 10 DERIVED p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 10 DERIVED p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 9 DERIVED t2 system NULL NULL NULL NULL 1 9 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where 9 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 9 DERIVED p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 9 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 9 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 9 DERIVED p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 9 DERIVED p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 8 DERIVED t2 system NULL NULL NULL NULL 1 8 DERIVED p1 ALL NULL NULL NULL NULL 550 Using where 8 DERIVED p3 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 8 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 8 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 8 DERIVED p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 8 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 8 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 8 DERIVED p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 8 DERIVED p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 7 DERIVED t2 system NULL NULL NULL NULL 1 7 DERIVED p1 ALL NULL NULL NULL NULL 550 Using where 7 DERIVED p3 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (flat, BNL join) 7 DERIVED p4 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 7 DERIVED p5 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 7 DERIVED p6 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 7 DERIVED p7 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 7 DERIVED p8 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 7 DERIVED p9 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join) 7 DERIVED p10 ALL NULL NULL NULL NULL 550 Using where; Using join buffer (incremental, BNL join)
DROP TABLE t1, t2;
#
# MDEV-19778: equality condition for mergeable view returning constants
# in its columns and used as inner table of outer join
#
create table t1 (pk int, a int);
insert into t1 values (1,7), (2,3), (3,2), (4,3);
create table t2 (b int);
insert into t2 values (5), (1), (NULL), (3);
create table t3 (c int);
insert into t3 values (1), (8);
create view v1 as
select 3 as d, t2.b from t2;
select * from t1 left join v1 on t1.pk <= 2 where t1.a=v1.d;
pk a d b 2335 2331 233 NULL 2333
explain extended select * from t1 left join v1 on t1.pk <= 2 where t1.a=v1.d;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 4100.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 4100.00 Using join buffer (flat, BNL join)
Warnings:
Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a` AS `a`,3 AS `d`,`test`.`t2`.`b` AS `b` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = 3and `test`.`t1`.`pk` <= 2
select * from t1 left join (select 3 as d, t2.b from t2) dt on t1.pk <= 2
where t1.a=dt.d;
pk a d b 2335 2331 233 NULL 2333
explain extended select * from t1 left join (select 3 as d, t2.b from t2) dt on t1.pk <= 2
where t1.a=dt.d;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 4100.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 4100.00 Using join buffer (flat, BNL join)
Warnings:
Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a` AS `a`,3 AS `d`,`test`.`t2`.`b` AS `b` from `test`.`t1` join `test`.`t2` where `test`.`t1`.`a` = 3and `test`.`t1`.`pk` <= 2
select * from t1 left join (v1,t3) on t1.pk <= 2 where t1.a=v1.d;
pk a d b c 23351 23358 23311 23318 233 NULL 1 233 NULL 8 23331 23338
explain extended select * from t1 left join (v1,t3) on t1.pk <= 2 where t1.a=v1.d;
id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t3 ALL NULL NULL NULL NULL 2100.00 1 SIMPLE t1 ALL NULL NULL NULL NULL 4100.00 Using where; Using join buffer (flat, BNL join) 1 SIMPLE t2 ALL NULL NULL NULL NULL 4100.00 Using join buffer (incremental, BNL join)
Warnings:
Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a` AS `a`,3 AS `d`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`c` AS `c` from `test`.`t1` join `test`.`t2` join `test`.`t3` where `test`.`t1`.`a` = 3and `test`.`t1`.`pk` <= 2
drop view v1;
drop table t1,t2,t3;
#
# MDEV-25679: view / derived table defined as ordered select with LIMIT
#
create table t1 (a int);
insert into t1 values (3), (7), (1);
create view v1 as (select a from t1 limit 2) order by a desc;
(select a from t1 limit 2) order by a desc;
a 7 3
select * from v1;
a 7 3
select * from ((select a from t1 limit 2) order by a desc) dt;
a 3 7
drop view v1;
drop table t1;
#
# MDEV-24454 Second execution of SELECT containing set function
# MDEV-25086: whose only argument is an outer reference to a column
# of mergeable view/derived/table/CTE
#
create table t1 (a int);
create table t2 (b int);
insert into t1 values (3), (1), (3);
insert into t2 values (70), (30), (70);
create view v1 as select * from t2;
prepare stmt from "
select (select sum(b) from t1 where a=1) as r from v1; ";
execute stmt;
r 170
execute stmt;
r 170
deallocate prepare stmt;
prepare stmt from "
select (select sum(b) from t1 where a=1) as r from (select * from t2) dt; ";
execute stmt;
r 170
execute stmt;
r 170
deallocate prepare stmt;
prepare stmt from "
with cte as (select * from t2)
select (select sum(b) from t1 where a=1) as r from cte; ";
execute stmt;
r 170
execute stmt;
r 170
deallocate prepare stmt;
prepare stmt from "
select (select sum(b) from t1 where a=1) as r
from (select * from v1 where b > 50) dt; ";
execute stmt;
r 140
execute stmt;
r 140
deallocate prepare stmt;
prepare stmt from "
select (select sum(b) from t1 where a=1) as r
from (select * from (select * from t2) dt1 where b > 50) dt; ";
execute stmt;
r 140
execute stmt;
r 140
deallocate prepare stmt;
prepare stmt from "
with cte as (select * from (select * from t2) dt1 where b > 50)
select (select sum(b) from t1 where a=1) as r from cte; ";
execute stmt;
r 140
execute stmt;
r 140
deallocate prepare stmt;
create procedure sp1()
begin
select (select sum(b) from t1 where a=1) as r from v1;
end |
call sp1();
r 170
call sp1();
r 170
drop procedure sp1;
create procedure sp1()
begin
select (select sum(b) from t1 where a=1) as r from (select * from t2) dt;
end |
call sp1();
r 170
call sp1();
r 170
drop procedure sp1;
create procedure sp1()
begin
with cte as (select * from t2)
select (select sum(b) from t1 where a=1) as r from cte;
end |
call sp1();
r 170
call sp1();
r 170
drop procedure sp1;
drop view v1;
drop table t1,t2;
CREATE TABLE t1(f0 INT);
INSERT INTO t1 VALUES (3);
CREATE VIEW v1 AS SELECT f0 AS f1 FROM t1;
CREATE VIEW v2 AS
SELECT
(SELECT GROUP_CONCAT(v1.f1 SEPARATOR ', ') FROM v1 n) AS f2,
GROUP_CONCAT('aa' SEPARATOR ', ') AS f3
FROM v1;
CREATE VIEW v3 AS SELECT * FROM v2;
CREATE PROCEDURE p1()
SELECT * FROM v3;
CALL p1();
f2 f3 3 aa
CALL p1();
f2 f3 3 aa
DROP PROCEDURE p1;
DROP VIEW v1,v2,v3;
DROP TABLE t1;
#
# MDEV-27212: 2-nd execution of PS for select with embedded derived tables
# and correlated subquery in select list of outer derived
#
create table t1 ( id int, id2 int ) engine=myisam;
create table t2 ( x3 int , x1 int , x2 int, a1 int) engine=myisam;
insert into t1 values (3, 2), (4, 2), (3, 4);
insert into t2 values (1, 2, 2, 1), (1, 3, 3, 2), (2, 3, 3, 1);
prepare stmt from "select id from t1
join
( select dt2.x1,
( select sum(a1) from t2 where t2.x1 = dt2.x1 ) m
from ( select x1 from t2 u where x3 = 1 ) dt2
) dt
on t1.id = dt.x1
where t1.id2 < dt.m";
execute stmt;
id 3
execute stmt;
id 3
deallocate prepare stmt;
create procedure sp1() select id from t1
join
( select dt2.x1,
( select sum(a1) from t2 where t2.x1 = dt2.x1 ) m
from ( select x1 from t2 u where x3 = 1 ) dt2
) dt
on t1.id = dt.x1
where t1.id2 < dt.m;
call sp1();
id 3
call sp1();
id 3
create view v2 as select x1 from t2 u where x3 = 1;
create view v as
select v2.x1,
( select sum(a1) from t2 where t2.x1 = v2.x1 ) m from v2;
prepare stmt from "select id from t1 join v on t1.id = v.x1 where t1.id2 < v.m";
execute stmt;
id 3
execute stmt;
id 3
deallocate prepare stmt;
create procedure sp2() select id from t1 join v on t1.id = v.x1 where t1.id2 < v.m;
call sp2();
id 3
call sp2();
id 3
drop procedure sp1;
drop procedure sp2;
drop view v, v2;
drop table t1,t2;
# End of 10.2 tests
#
# MDEV-30706: view defined as select with implicit grouping and
# a set function used in a subquery
#
CREATE TABLE t1 (a INT PRIMARY KEY, b INT);
INSERT INTO t1 VALUES (1,1), (2,2);
CREATE TABLE t2 (a INT PRIMARY KEY, b INT);
INSERT INTO t2 VALUES (1,1), (3,3);
CREATE TABLE t3 (a INT PRIMARY KEY, b INT);
INSERT INTO t3 VALUES (2,2), (4,4), (7,7);
CREATE TABLE t4 (a INT PRIMARY KEY, b INT);
INSERT INTO t4 VALUES (2,2), (5,5), (7,7);
CREATE VIEW v AS SELECT
(SELECT SUM(t4.b) FROM t1, t2 WHERE t1.a = t2.b GROUP BY t1.a) AS m
FROM t3, t4
WHERE t3.a = t4.b;
SELECT
(SELECT SUM(t4.b) FROM t1, t2 WHERE t1.a = t2.b GROUP BY t1.a) AS m
FROM t3, t4
WHERE t3.a = t4.b;
m 9
SELECT * FROM v;
m 9
WITH cte AS ( SELECT
(SELECT SUM(t4.b) FROM t1, t2 WHERE t1.a = t2.b GROUP BY t1.a) AS m
FROM t3, t4
WHERE t3.a = t4.b ) SELECT * FROM cte;
m 9
EXPLAIN SELECT
(SELECT SUM(t4.b) FROM t1, t2 WHERE t1.a = t2.b GROUP BY t1.a) AS m
FROM t3, t4
WHERE t3.a = t4.b;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t4 ALL NULL NULL NULL NULL 3 Using where 1 PRIMARY t3 eq_ref PRIMARY PRIMARY 4 test.t4.b 1 Using index 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using temporary; Using filesort 2 DEPENDENT SUBQUERY t1 eq_ref PRIMARY PRIMARY 4 test.t2.b 1 Using index
EXPLAIN SELECT * FROM v;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 2 SUBQUERY t4 ALL NULL NULL NULL NULL 3 Using where 2 SUBQUERY t3 eq_ref PRIMARY PRIMARY 4 test.t4.b 1 Using index 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using temporary; Using filesort 3 DEPENDENT SUBQUERY t1 eq_ref PRIMARY PRIMARY 4 test.t2.b 1 Using index
EXPLAIN WITH cte AS ( SELECT
(SELECT SUM(t4.b) FROM t1, t2 WHERE t1.a = t2.b GROUP BY t1.a) AS m
FROM t3, t4
WHERE t3.a = t4.b ) SELECT * FROM cte;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 2 DERIVED t4 ALL NULL NULL NULL NULL 3 Using where 2 DERIVED t3 eq_ref PRIMARY PRIMARY 4 test.t4.b 1 Using index 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where; Using temporary; Using filesort 3 DEPENDENT SUBQUERY t1 eq_ref PRIMARY PRIMARY 4 test.t2.b 1 Using index
PREPARE stmt FROM "SELECT
(SELECT SUM(t4.b) FROM t1, t2 WHERE t1.a = t2.b GROUP BY t1.a) AS m
FROM t3, t4
WHERE t3.a = t4.b";
execute stmt;
m 9
execute stmt;
m 9
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "SELECT * FROM v";
execute stmt;
m 9
execute stmt;
m 9
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "WITH cte AS ( SELECT
(SELECT SUM(t4.b) FROM t1, t2 WHERE t1.a = t2.b GROUP BY t1.a) AS m
FROM t3, t4
WHERE t3.a = t4.b ) SELECT * FROM cte";
execute stmt;
m 9
execute stmt;
m 9
DEALLOCATE PREPARE stmt;
DROP VIEW v;
DROP TABLE t1,t2,t3,t4;
#
# MDEV-29224: view defined as select with implicit grouping and
# a set function used in a subquery
#
CREATE TABLE t1 (f1 INT);
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (f2 int);
INSERT INTO t2 VALUES (3);
CREATE VIEW v AS SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
( SELECT MAX(f1) FROM t2 ) 2
SELECT * FROM v;
( SELECT MAX(f1) FROM t2 ) 2
WITH cte AS ( SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1 ) SELECT * FROM cte;
( SELECT MAX(f1) FROM t2 ) 2
EXPLAIN SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
EXPLAIN SELECT * FROM v;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 3 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
EXPLAIN WITH cte AS ( SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1 ) SELECT * FROM cte;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 2 DERIVED t1 ALL NULL NULL NULL NULL 2 3 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
PREPARE stmt FROM "SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1";
execute stmt;
( SELECT MAX(f1) FROM t2 ) 2
execute stmt;
( SELECT MAX(f1) FROM t2 ) 2
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "SELECT * FROM v";
execute stmt;
( SELECT MAX(f1) FROM t2 ) 2
execute stmt;
( SELECT MAX(f1) FROM t2 ) 2
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "WITH cte AS ( SELECT ( SELECT MAX(f1) FROM t2 ) FROM t1 ) SELECT * FROM cte";
execute stmt;
( SELECT MAX(f1) FROM t2 ) 2
execute stmt;
( SELECT MAX(f1) FROM t2 ) 2
DEALLOCATE PREPARE stmt;
DROP VIEW v;
DROP TABLE t1,t2;
#
# MDEV-28573: view defined as select with implicit grouping and
# a set function used in a subquery
#
CREATE TABLE t1 (a INTEGER, b INTEGER);
CREATE TABLE t2 (c INTEGER);
INSERT INTO t1 VALUES (1,11), (2,22), (2,22);
INSERT INTO t2 VALUES (1), (2);
CREATE VIEW v1 AS SELECT (SELECT COUNT(b) FROM t2) FROM t1;
CREATE VIEW v2 AS SELECT (SELECT COUNT(b) FROM t2 WHERE c > 1) FROM t1;
SELECT (SELECT COUNT(b) FROM t2) FROM t1; ERROR21000: Subquery returns more than 1 row
SELECT * FROM v1; ERROR21000: Subquery returns more than 1 row
WITH cte AS ( SELECT (SELECT COUNT(b) FROM t2) FROM t1 ) SELECT * FROM cte; ERROR21000: Subquery returns more than 1 row
SELECT (SELECT COUNT(b) FROM t2 WHERE c > 1) FROM t1;
(SELECT COUNT(b) FROM t2 WHERE c > 1) 3
SELECT * FROM v2;
(SELECT COUNT(b) FROM t2 WHERE c > 1) 3
WITH cte AS ( SELECT (SELECT COUNT(b) FROM t2 WHERE c > 1) FROM t1 ) SELECT * FROM cte;
(SELECT COUNT(b) FROM t2 WHERE c > 1) 3
EXPLAIN SELECT (SELECT COUNT(b) FROM t2) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2
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 2 SUBQUERY t1 ALL NULL NULL NULL NULL 3 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2
EXPLAIN WITH cte AS ( SELECT (SELECT COUNT(b) FROM t2) FROM t1 ) SELECT * FROM cte;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 2 DERIVED t1 ALL NULL NULL NULL NULL 3 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2
PREPARE stmt FROM "SELECT (SELECT COUNT(b) FROM t2) FROM t1";
execute stmt; ERROR21000: Subquery returns more than 1 row
execute stmt; ERROR21000: Subquery returns more than 1 row
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "SELECT * FROM v1";
execute stmt; ERROR21000: Subquery returns more than 1 row
execute stmt; ERROR21000: Subquery returns more than 1 row
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "WITH cte AS ( SELECT (SELECT COUNT(b) FROM t2) FROM t1 ) SELECT * FROM cte";
execute stmt; ERROR21000: Subquery returns more than 1 row
execute stmt; ERROR21000: Subquery returns more than 1 row
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "SELECT (SELECT COUNT(b) FROM t2 WHERE c > 1) FROM t1";
execute stmt;
(SELECT COUNT(b) FROM t2 WHERE c > 1) 3
execute stmt;
(SELECT COUNT(b) FROM t2 WHERE c > 1) 3
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "SELECT * FROM v2";
execute stmt;
(SELECT COUNT(b) FROM t2 WHERE c > 1) 3
execute stmt;
(SELECT COUNT(b) FROM t2 WHERE c > 1) 3
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "WITH cte AS ( SELECT (SELECT COUNT(b) FROM t2 WHERE c > 1) FROM t1 ) SELECT * FROM cte";
execute stmt;
(SELECT COUNT(b) FROM t2 WHERE c > 1) 3
execute stmt;
(SELECT COUNT(b) FROM t2 WHERE c > 1) 3
DEALLOCATE PREPARE stmt;
DROP VIEW v1,v2;
DROP TABLE t1,t2;
#
# MDEV-28570: VIEW with WHERE containing subquery
# with set function aggregated in query
#
CREATE TABLE t1 (a int, b int);
CREATE TABLE t2 (c int, d int);
INSERT INTO t1 VALUES
(1,10), (2,10), (1,20), (2,20), (3,20), (2,30), (4,40);
INSERT INTO t2 VALUES
(2,10), (2,20), (4,10), (5,10), (3,20), (2,40);
CREATE VIEW v AS SELECT a FROM t1 GROUP BY a
HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>20);
SELECT a FROM t1 GROUP BY a
HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>20);
a 2 4
SELECT * FROM v;
a 2 4
WITH cte AS ( SELECT a FROM t1 GROUP BY a
HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>20) ) SELECT * FROM cte;
a 2 4
EXPLAIN SELECT a FROM t1 GROUP BY a
HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>20);
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 7 Using temporary; Using filesort 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 6
EXPLAIN SELECT * FROM v;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 7 2 DERIVED t1 ALL NULL NULL NULL NULL 7 Using temporary; Using filesort 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 6
EXPLAIN WITH cte AS ( SELECT a FROM t1 GROUP BY a
HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>20) ) SELECT * FROM cte;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 7 2 DERIVED t1 ALL NULL NULL NULL NULL 7 Using temporary; Using filesort 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 6
PREPARE stmt FROM "SELECT a FROM t1 GROUP BY a
HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>20)";
execute stmt;
a 2 4
execute stmt;
a 2 4
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "SELECT * FROM v";
execute stmt;
a 2 4
execute stmt;
a 2 4
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "WITH cte AS ( SELECT a FROM t1 GROUP BY a
HAVING a IN (SELECT c FROM t2 WHERE MAX(b)>20) ) SELECT * FROM cte";
execute stmt;
a 2 4
execute stmt;
a 2 4
DEALLOCATE PREPARE stmt;
DROP VIEW v;
DROP TABLE t1,t2;
#
# MDEV-28571: VIEW with select list containing subquery
# with set function aggregated in query
#
CREATE TABLE t1 (a int, b int);
CREATE TABLE t2 (m int, n int);
INSERT INTO t1 VALUES (2,2), (2,2), (3,3), (3,3), (3,3), (4,4);
INSERT INTO t2 VALUES (1,11), (2,22), (3,32), (4,44), (4,44);
CREATE VIEW v AS SELECT (SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a) AS c
FROM t1
GROUP BY a;
SELECT (SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a) AS c
FROM t1
GROUP BY a;
c 2 3 1,1
SELECT * FROM v;
c 2 3 1,1
WITH cte AS ( SELECT (SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a) AS c
FROM t1
GROUP BY a ) SELECT * FROM cte;
c 2 3 1,1
EXPLAIN SELECT (SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a) AS c
FROM t1
GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 5 Using where
EXPLAIN SELECT * FROM v;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 2 DERIVED t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 5 Using where
EXPLAIN WITH cte AS ( SELECT (SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a) AS c
FROM t1
GROUP BY a ) SELECT * FROM cte;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 2 DERIVED t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 5 Using where
PREPARE stmt FROM "SELECT (SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a) AS c
FROM t1
GROUP BY a";
execute stmt;
c 2 3 1,1
execute stmt;
c 2 3 1,1
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "SELECT * FROM v";
execute stmt;
c 2 3 1,1
execute stmt;
c 2 3 1,1
DEALLOCATE PREPARE stmt;
PREPARE stmt FROM "WITH cte AS ( SELECT (SELECT GROUP_CONCAT(COUNT(a)) FROM t2 WHERE m = a) AS c
FROM t1
GROUP BY a ) SELECT * FROM cte";
execute stmt;
c 2 3 1,1
execute stmt;
c 2 3 1,1
DEALLOCATE PREPARE stmt;
DROP VIEW v;
DROP TABLE t1,t2;
#
# MDEV-30668: VIEW with WHERE containing nested subquery
# with set function aggregated in outer subquery
#
create table t1 (a int);
insert into t1 values (3), (7), (1);
create table t2 (b int);
insert into t2 values (2), (1), (4), (7);
create table t3 (a int, b int);
insert into t3 values (2,10), (7,30), (2,30), (1,10), (7,40);
create view v as select * from t1
where t1.a in (select t3.a from t3 group by t3.a
having t3.a > any (select t2.b from t2
where t2.b*10 < sum(t3.b)));
select * from t1
where t1.a in (select t3.a from t3 group by t3.a
having t3.a > any (select t2.b from t2
where t2.b*10 < sum(t3.b)));
a 7
select * from v;
a 7
with cte as ( select * from t1
where t1.a in (select t3.a from t3 group by t3.a
having t3.a > any (select t2.b from t2
where t2.b*10 < sum(t3.b))) ) select * from cte;
a 7
explain select * from t1
where t1.a in (select t3.a from t3 group by t3.a
having t3.a > any (select t2.b from t2
where t2.b*10 < sum(t3.b)));
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where 1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 test.t1.a 1 2 MATERIALIZED t3 ALL NULL NULL NULL NULL 5 Using temporary 3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 4 Using where
explain select * from v;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where 1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 test.t1.a 1 3 MATERIALIZED t3 ALL NULL NULL NULL NULL 5 Using temporary 4 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 4 Using where
explain with cte as ( select * from t1
where t1.a in (select t3.a from t3 group by t3.a
having t3.a > any (select t2.b from t2
where t2.b*10 < sum(t3.b))) ) select * from cte;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where 1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 test.t1.a 1 3 MATERIALIZED t3 ALL NULL NULL NULL NULL 5 Using temporary 4 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 4 Using where
prepare stmt from "select * from t1
where t1.a in (select t3.a from t3 group by t3.a
having t3.a > any (select t2.b from t2
where t2.b*10 < sum(t3.b)))";
execute stmt;
a 7
execute stmt;
a 7
deallocate prepare stmt;
prepare stmt from "select * from v";
execute stmt;
a 7
execute stmt;
a 7
deallocate prepare stmt;
prepare stmt from "with cte as ( select * from t1
where t1.a in (select t3.a from t3 group by t3.a
having t3.a > any (select t2.b from t2
where t2.b*10 < sum(t3.b))) ) select * from cte";
execute stmt;
a 7
execute stmt;
a 7
deallocate prepare stmt;
drop view v;
drop table t1,t2,t3;
#
# MDEV-32829 Crash when executing PS for query with eliminated subquery
# using view
#
create view v1 as select 1 as a;
prepare stmt from 'SELECT EXISTS (SELECT 1 FROM v1 GROUP BY a IN (SELECT a FROM v1))';
execute stmt;
EXISTS (SELECT 1 FROM v1 GROUP BY a IN (SELECT a FROM v1)) 1
drop view v1;
create table t1 (a int, b int);
insert into t1 values (1,2),(3,4),(5,6);
create view v1 as select * from t1;
create table t2 select * from t1;
prepare stmt from "select t2.a from t2 where exists
(
select * from t1 where t2.b = t1.b and t1.b != 6
group by a in (select a from v1 where v1.a = t2.a)
)";
execute stmt;
a 1 3
execute stmt;
a 1 3
deallocate prepare stmt;
create procedure aproc() select t2.a from t2 where exists
(
select * from t1 where t2.b = t1.b and t1.b != 6
group by a in (select a from v1 where v1.a = t2.a)
);
call aproc();
a 1 3
call aproc();
a 1 3
drop table t1, t2;
drop view v1;
drop procedure aproc;
#
# MDEV-31305: Aggregation over materialized derived table
#
CREATE VIEW v AS
SELECT seq1.seq AS dim1, seq2.seq AS dim2, seq3.seq AS dim3,
FLOOR(RAND(13) * 5) AS p
FROM seq_100_to_105 seq1
JOIN seq_10_to_15 seq2
JOIN seq_1_to_5 seq3;
SELECT v.*, SUM(p) from v;
dim1 dim2 dim3 p SUM(p) 1001012371
SELECT d.*, SUM(p)
FROM (
SELECT seq1.seq AS dim1, seq2.seq AS dim2, seq3.seq AS dim3,
FLOOR(RAND(13) * 5) AS p
FROM seq_100_to_105 seq1
JOIN seq_10_to_15 seq2
JOIN seq_1_to_5 seq3
) d;
dim1 dim2 dim3 p SUM(p) 1001012371
WITH demo AS
(
SELECT seq1.seq AS dim1, seq2.seq AS dim2, seq3.seq AS dim3,
FLOOR(RAND(13) * 5) AS p
FROM seq_100_to_105 seq1
JOIN seq_10_to_15 seq2
JOIN seq_1_to_5 seq3
)
SELECT d.*, SUM(p) FROM demo d;
dim1 dim2 dim3 p SUM(p) 1001012371
DROP VIEW v;
# End of 10.4 tests
#
# MDEV-31277: 2-nd execution of PS to select from materialized view
# specified as left join whose inner table is mergeable
# derived containing a constant column
#
create table t1 (
Election int(10) unsigned NOT NULL
) engine=MyISAM;
insert into t1 (Election) values (1), (4);
create table t2 (
VoteID int(10),
ElectionID int(10),
UserID int(10)
);
insert into t2 (ElectionID, UserID) values (2, 30), (3, 30);
create view v1 as select * from t1
left join ( select 'Y' AS Voted, ElectionID from t2 ) AS T
on T.ElectionID = t1.Election
limit 9;
prepare stmt1 from "select * from v1";
execute stmt1;
Election Voted ElectionID 1 NULL NULL 4 NULL NULL
execute stmt1;
Election Voted ElectionID 1 NULL NULL 4 NULL NULL
deallocate prepare stmt1;
drop view v1;
drop table t1, t2;
# End of 10.5 tests
#
# MDEV-31143: view with ORDER BY used in query with rownum() in WHERE
#
create table t1 (id int primary key);
insert into t1 values (3), (7), (1);
create table t2 (a int);
insert into t2 values (2), (4);
create view v as select a from t2 order by a; set statement tmp_memory_table_size=0 for
select t1.id from v, t1 where rownum() = 1 group by t1.id;
id 1
drop view v;
drop table t1, t2;
#
# MDEV-31162: multi-table mergeable view with ORDER BY used
# in query with rownum() in WHERE
#
create table t1 (a INT) engine=MyISAM;
insert into t1 values (1),(2);
create table t2 (b INT) engine=MyISAM;
insert into t2 values (3),(4);
create view v1 AS select * from t1 join t2 order by b;
explain select * from v1 where rownum() <= 2;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort 1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
select * from v1 where rownum() <= 2;
a b 13 23
prepare stmt from "select * from v1 where rownum() <= 2";
execute stmt;
a b 13 23
execute stmt;
a b 13 23
deallocate prepare stmt;
create view v2 AS select * from t1 join t2 order by b/a;
explain select * from v2 where rownum() <= 2;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort 1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
select * from v2 where rownum() <= 2;
a b 23 13
prepare stmt from "select * from v2 where rownum() <= 2";
execute stmt;
a b 23 13
execute stmt;
a b 23 13
deallocate prepare stmt;
drop view v1,v2;
drop table t1,t2;
# End of 10.6 tests
#
# MDEV-37266: Assertion in create_ref_for_key() with
# derived_merge OFF
# SET @save_optimizer_switch=@@optimizer_switch; SET optimizer_switch='derived_with_keys=on';
CREATE TABLE t1 AS SELECT 1 AS a FROM seq_1_to_2;
SELECT md5(a) IN (SELECT * FROM (SELECT '' FROM t1) as x) FROM t1;
md5(a) IN (SELECT * FROM (SELECT '' FROM t1) as x) 0 0
DROP table t1; SET optimizer_switch=@save_optimizer_switch;
#
# MDEV-36059: 2nd PS exec crash w/nested VIEWs
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (1),(2);
CREATE VIEW v1 AS SELECT b FROM t2;
CREATE VIEW v2 AS SELECT b FROM v1;
SELECT * FROM t1 WHERE a IN (SELECT b FROM v2);
a 1 2
PREPARE stmt FROM 'DELETE FROM t1 WHERE a IN (SELECT b FROM v2)';
SELECT * FROM t1;
a 1 2
EXECUTE stmt;
SELECT * FROM t1;
a
EXECUTE stmt;
SELECT * FROM t1;
a
DROP VIEW v2, v1;
DROP TABLE t1, t2;
#
# Same crash when the subquery view sits inside deep nest.
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2),(3);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (1),(2);
CREATE TABLE t3 (c INT);
INSERT INTO t3 VALUES (1),(2);
CREATE TABLE t4 (d INT);
INSERT INTO t4 VALUES (1),(2);
CREATE VIEW v1 AS SELECT b FROM t2;
CREATE VIEW v2 AS SELECT b FROM v1;
SELECT * FROM t1;
a 1 2 3
SELECT * FROM t1 WHERE a IN (SELECT t3.c FROM t3 LEFT JOIN (v2 JOIN t4 ON v2.b = t4.d) ON t3.c = v2.b);
a 1 2
PREPARE stmt FROM 'DELETE FROM t1 WHERE a IN (SELECT t3.c FROM t3 LEFT JOIN (v2 JOIN t4 ON v2.b = t4.d) ON t3.c = v2.b)';
EXECUTE stmt;
SELECT * FROM t1;
a 3
EXECUTE stmt;
SELECT * FROM t1;
a 3
SELECT a FROM t1;
a 3
DROP VIEW v2, v1;
DROP TABLE t1, t2, t3, t4;
# End of 11.4 tests
Messung V0.5 in Prozent
¤ Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.0.148Bemerkung:
(vorverarbeitet am 2026-10-08)
¤
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.
