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Commit 62bf7f61 authored by Sergey Petrunya's avatar Sergey Petrunya
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MWL#90: Subqueries: Inside-out execution for non-semijoin materialized... 

MWL#90: Subqueries: Inside-out execution for non-semijoin materialized subqueries that are AND-parts of the WHERE
- Code cleanu.
- Make MWL#90 code require @@optimizer_switch='semijoin=on'
- Update test results with the above
- Fork subselect_mat.test - we want to check both semi-join materialization, 
  which now has broader scope and non-semijoin materialization.
parent 5a53be65
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Showing with 2399 additions and 1126 deletions
mysql-test/r/subselect_mat.result
View file @ 62bf7f61
set @@optimizer_switch='semijoin=off';
set optimizer_switch='firstmatch=off';
drop table if exists t1, t2, t3, t1i, t2i, t3i;
drop view if exists v1, v2, v1m, v2m;
create table t1 (a1 char(8), a2 char(8));
......@@ -30,7 +32,6 @@ create index it3i3 on t3i (c1, c2);
insert into t1i select * from t1;
insert into t2i select * from t2;
insert into t3i select * from t3;
set @@optimizer_switch='semijoin=off';
/******************************************************************************
* Simple tests.
******************************************************************************/
......@@ -38,11 +39,10 @@ set @@optimizer_switch='semijoin=off';
explain extended
select * from t1 where a1 in (select b1 from t2 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 9 test.t1.a1 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2`.`b1` AS `b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0')) join `test`.`t1` where (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`)
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a1`,`test`.`t1`.`a1` in ( <materialize> (select `test`.`t2`.`b1` AS `b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`)))))
select * from t1 where a1 in (select b1 from t2 where b1 > '0');
a1 a2
1 - 01 2 - 01
......@@ -50,11 +50,10 @@ a1 a2
explain extended
select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 9 test.t1.a1 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2`.`b1` AS `b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`) join `test`.`t1` where (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`)
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a1`,`test`.`t1`.`a1` in ( <materialize> (select `test`.`t2`.`b1` AS `b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`)))))
select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
a1 a2
1 - 01 2 - 01
......@@ -62,11 +61,10 @@ a1 a2
explain extended
select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`,`test`.`t2`.`b2`) join `test`.`t1` where ((`SUBQUERY#2`.`b2` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`,`test`.`t2`.`b2` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`)))))
select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
a1 a2
1 - 01 2 - 01
......@@ -74,11 +72,10 @@ a1 a2
explain extended
select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2`.`b1` AS `b1`,min(`test`.`t2`.`b2`) AS `min(b2)` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`) join `test`.`t1` where ((`SUBQUERY#2`.`min(b2)` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,min(`test`.`t2`.`b2`) AS `min(b2)` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`min(b2)`)))))
select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
a1 a2
1 - 01 2 - 01
......@@ -86,11 +83,10 @@ a1 a2
explain extended
select * from t1i where a1 in (select b1 from t2i where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1i index it1i1,it1i3 it1i3 18 NULL 3 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 9 test.t1i.a1 1 100.00
1 PRIMARY t1i index NULL it1i3 18 NULL 3 100.00 Using where; Using index
2 SUBQUERY t2i index it2i1,it2i3 it2i1 9 NULL 5 100.00 Using where; Using index
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0')) join `test`.`t1i` where (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`)
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>(`test`.`t1i`.`a1`,`test`.`t1i`.`a1` in ( <materialize> (select `test`.`t2i`.`b1` AS `b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`)))))
select * from t1i where a1 in (select b1 from t2i where b1 > '0');
a1 a2
1 - 01 2 - 01
......@@ -98,11 +94,10 @@ a1 a2
explain extended
select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL distinct_key # NULL # 3 100.00 #
1 PRIMARY t1i ref it1i1,it1i3 # 9 # 1 100.00 #
1 PRIMARY t1i index NULL # 18 # 3 100.00 #
2 SUBQUERY t2i range it2i1,it2i3 # 9 # 3 100.00 #
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`) join `test`.`t1i` where (`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`)
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>(`test`.`t1i`.`a1`,`test`.`t1i`.`a1` in ( <materialize> (select `test`.`t2i`.`b1` AS `b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`)))))
select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
a1 a2
1 - 01 2 - 01
......@@ -110,11 +105,10 @@ a1 a2
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1i index it1i1,it1i2,it1i3 it1i3 18 NULL 3 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1i.a1,test.t1i.a2 1 100.00
1 PRIMARY t1i index NULL it1i3 18 NULL 3 100.00 Using where; Using index
2 SUBQUERY t2i index it2i1,it2i3 it2i3 18 NULL 5 100.00 Using where; Using index
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0')) join `test`.`t1i` where ((`SUBQUERY#2`.`b2` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1i`.`a2` = `SUBQUERY#2`.`b2`)))))
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
a1 a2
1 - 01 2 - 01
......@@ -122,11 +116,10 @@ a1 a2
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1i index it1i1,it1i2,it1i3 # # # 3 100.00 #
1 PRIMARY SUBQUERY#2 eq_ref distinct_key # # # 1 100.00 #
1 PRIMARY t1i index NULL # # # 3 100.00 #
2 SUBQUERY t2i range it2i1,it2i3 # # # 3 100.00 #
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`,`test`.`t2i`.`b2`) join `test`.`t1i` where ((`SUBQUERY#2`.`b2` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`,`test`.`t2i`.`b2` ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1i`.`a2` = `SUBQUERY#2`.`b2`)))))
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
a1 a2
1 - 01 2 - 01
......@@ -134,11 +127,10 @@ a1 a2
explain extended
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1i index it1i1,it1i2,it1i3 # # # 3 100.00 #
1 PRIMARY SUBQUERY#2 eq_ref distinct_key # # # 1 100.00 #
1 PRIMARY t1i index NULL # # # 3 100.00 #
2 SUBQUERY t2i range it2i1,it2i3 # # # 3 100.00 #
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,min(`test`.`t2i`.`b2`) AS `min(b2)` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`) join `test`.`t1i` where ((`SUBQUERY#2`.`min(b2)` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,min(`test`.`t2i`.`b2`) AS `min(b2)` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1i`.`a2` = `SUBQUERY#2`.`min(b2)`)))))
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
a1 a2
1 - 01 2 - 01
......@@ -146,11 +138,10 @@ a1 a2
explain extended
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2i range NULL it2i3 9 NULL 3 100.00 Using index for group-by
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,max(`test`.`t2i`.`b2`) AS `max(b2)` from `test`.`t2i` group by `test`.`t2i`.`b1`) join `test`.`t1` where ((`SUBQUERY#2`.`max(b2)` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,max(`test`.`t2i`.`b2`) AS `max(b2)` from `test`.`t2i` group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`max(b2)`)))))
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1);
a1 a2
1 - 01 2 - 01
......@@ -158,13 +149,11 @@ a1 a2
prepare st1 from "explain select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)";
execute st1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t2i range NULL it2i3 9 NULL 3 Using index for group-by
execute st1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t2i range NULL it2i3 9 NULL 3 Using index for group-by
prepare st2 from "select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)";
execute st2;
......@@ -178,17 +167,17 @@ a1 a2
explain extended
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2i range it2i1,it2i3 it2i3 18 NULL 3 100.00 Using where; Using index for group-by
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,min(`test`.`t2i`.`b2`) AS `min(b2)` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`) join `test`.`t1` where ((`SUBQUERY#2`.`min(b2)` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,min(`test`.`t2i`.`b2`) AS `min(b2)` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`min(b2)`)))))
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i limit 1,1);
ERROR 42000: This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='default,semijoin=off';
prepare st1 from
"select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1)";
......@@ -215,15 +204,14 @@ execute st1;
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
set @@optimizer_switch='default,semijoin=off';
set @@optimizer_switch=@save_optimizer_switch;
explain extended
select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` order by `test`.`t2`.`b1`,`test`.`t2`.`b2`) join `test`.`t1` where ((`SUBQUERY#2`.`b2` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` order by `test`.`t2`.`b1`,`test`.`t2`.`b2` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`)))))
select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
a1 a2
1 - 01 2 - 01
......@@ -231,11 +219,10 @@ a1 a2
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1i index it1i1,it1i2,it1i3 it1i3 18 NULL 3 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1i.a1,test.t1i.a2 1 100.00
1 PRIMARY t1i index NULL it1i3 18 NULL 3 100.00 Using where; Using index
2 SUBQUERY t2i index NULL it2i3 18 NULL 5 100.00 Using index
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` order by `test`.`t2i`.`b1`,`test`.`t2i`.`b2`) join `test`.`t1i` where ((`SUBQUERY#2`.`b2` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` order by `test`.`t2i`.`b1`,`test`.`t2i`.`b2` ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1i`.`a2` = `SUBQUERY#2`.`b2`)))))
select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
a1 a2
1 - 01 2 - 01
......@@ -285,15 +272,12 @@ where (a1, a2) in (select b1, b2 from t2 where b1 > '0') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL distinct_key NULL NULL NULL 5 0.00
1 PRIMARY SUBQUERY#3 eq_ref distinct_key distinct_key 18 SUBQUERY#2.b1,SUBQUERY#2.b2 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
3 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00
3 SUBQUERY SUBQUERY#4 eq_ref distinct_key distinct_key 18 test.t3.c1,test.t3.c2 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
3 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
4 SUBQUERY t2i index it2i2 it2i3 18 NULL 5 100.00 Using where; Using index
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` where ((`SUBQUERY#4`.`b2` = `test`.`t3`.`c2`) and (`SUBQUERY#4`.`b1` = `test`.`t3`.`c1`))) join <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0')) join `test`.`t1` where ((`SUBQUERY#3`.`c2` = `SUBQUERY#2`.`b2`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`) and (`SUBQUERY#3`.`c1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`))))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `SUBQUERY#4`.`b1`) and (`test`.`t3`.`c2` = `SUBQUERY#4`.`b2`))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#3`.`c1`) and (`test`.`t1`.`a2` = `SUBQUERY#3`.`c2`))))))
select * from t1
where (a1, a2) in (select b1, b2 from t2 where b1 > '0') and
(a1, a2) in (select c1, c2 from t3
......@@ -307,15 +291,12 @@ where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL distinct_key # # # 5 0.00 #
1 PRIMARY SUBQUERY#3 eq_ref distinct_key # # # 1 100.00 #
1 PRIMARY t1i ref it1i1,it1i2,it1i3 # # # 1 100.00 #
3 SUBQUERY t3i index it3i1,it3i2,it3i3 # # # 4 100.00 #
3 SUBQUERY SUBQUERY#4 eq_ref distinct_key # # # 1 100.00 #
1 PRIMARY t1i index NULL # # # 3 100.00 #
3 SUBQUERY t3i index NULL # # # 4 100.00 #
4 SUBQUERY t2i index it2i2 # # # 5 100.00 #
2 SUBQUERY t2i index it2i1,it2i3 # # # 5 100.00 #
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t3i`.`c1` AS `c1`,`test`.`t3i`.`c2` AS `c2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3i` where ((`SUBQUERY#4`.`b2` = `test`.`t3i`.`c2`) and (`SUBQUERY#4`.`b1` = `test`.`t3i`.`c1`))) join <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0')) join `test`.`t1i` where ((`SUBQUERY#3`.`c2` = `SUBQUERY#2`.`b2`) and (`test`.`t1i`.`a2` = `SUBQUERY#2`.`b2`) and (`SUBQUERY#3`.`c1` = `SUBQUERY#2`.`b1`) and (`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`))
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where (<in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1i`.`a2` = `SUBQUERY#2`.`b2`))))) and <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t3i`.`c1` AS `c1`,`test`.`t3i`.`c2` AS `c2` from `test`.`t3i` where <in_optimizer>((`test`.`t3i`.`c1`,`test`.`t3i`.`c2`),(`test`.`t3i`.`c1`,`test`.`t3i`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3i`.`c1` in <temporary table> on distinct_key where ((`test`.`t3i`.`c1` = `SUBQUERY#4`.`b1`) and (`test`.`t3i`.`c2` = `SUBQUERY#4`.`b2`))))) ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `SUBQUERY#3`.`c1`) and (`test`.`t1i`.`a2` = `SUBQUERY#3`.`c2`))))))
select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
......@@ -331,17 +312,14 @@ b2 in (select c2 from t3 where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL distinct_key NULL NULL NULL 5 0.00
1 PRIMARY SUBQUERY#5 eq_ref distinct_key distinct_key 18 SUBQUERY#2.b1,SUBQUERY#2.b2 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
5 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00
5 SUBQUERY SUBQUERY#6 eq_ref distinct_key distinct_key 18 test.t3.c1,test.t3.c2 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
5 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
6 SUBQUERY t2i index it2i2 it2i3 18 NULL 5 100.00 Using where; Using index
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where
4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
3 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` where ((`SUBQUERY#6`.`b2` = `test`.`t3`.`c2`) and (`SUBQUERY#6`.`b1` = `test`.`t3`.`c1`))) join <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#3`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`))))))) join `test`.`t1` where ((`SUBQUERY#5`.`c2` = `SUBQUERY#2`.`b2`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`) and (`SUBQUERY#5`.`c1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#3`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`))))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `SUBQUERY#6`.`b1`) and (`test`.`t3`.`c2` = `SUBQUERY#6`.`b2`))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#5`.`c1`) and (`test`.`t1`.`a2` = `SUBQUERY#5`.`c2`))))))
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
......@@ -359,16 +337,14 @@ b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
1 PRIMARY SUBQUERY#5 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
5 SUBQUERY t3c ALL NULL NULL NULL NULL 4 100.00
5 SUBQUERY SUBQUERY#6 eq_ref distinct_key distinct_key 18 test.t3c.c1,test.t3c.c2 1 100.00
5 SUBQUERY t3c ALL NULL NULL NULL NULL 4 100.00 Using where
6 SUBQUERY t2i index it2i2 it2i3 18 NULL 5 100.00 Using where; Using index
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where
4 SUBQUERY t3b ALL NULL NULL NULL NULL 4 100.00 Using where
3 DEPENDENT SUBQUERY t3a ALL NULL NULL NULL NULL 4 100.00 Using where
Warnings:
Note 1276 Field or reference 'test.t1.a1' of SELECT #3 was resolved in SELECT #1
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t3c`.`c1` AS `c1`,`test`.`t3c`.`c2` AS `c2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` `t3c` where ((`SUBQUERY#6`.`b2` = `test`.`t3c`.`c2`) and (`SUBQUERY#6`.`b1` = `test`.`t3c`.`c1`))) join `test`.`t1` where ((`SUBQUERY#5`.`c2` = `test`.`t1`.`a2`) and (`SUBQUERY#5`.`c1` = `test`.`t1`.`a1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((<in_optimizer>(`test`.`t2`.`b2`,<exists>(select 1 AS `Not_used` from `test`.`t3` `t3a` where ((`test`.`t3a`.`c1` = `test`.`t1`.`a1`) and (<cache>(`test`.`t2`.`b2`) = `test`.`t3a`.`c2`)))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3b`.`c2` AS `c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((<in_optimizer>(`test`.`t2`.`b2`,<exists>(select 1 AS `Not_used` from `test`.`t3` `t3a` where ((`test`.`t3a`.`c1` = `test`.`t1`.`a1`) and (<cache>(`test`.`t2`.`b2`) = `test`.`t3a`.`c2`)))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3b`.`c2` AS `c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t3c`.`c1` AS `c1`,`test`.`t3c`.`c2` AS `c2` from `test`.`t3` `t3c` where <in_optimizer>((`test`.`t3c`.`c1`,`test`.`t3c`.`c2`),(`test`.`t3c`.`c1`,`test`.`t3c`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3c`.`c1` in <temporary table> on distinct_key where ((`test`.`t3c`.`c1` = `SUBQUERY#6`.`b1`) and (`test`.`t3c`.`c2` = `SUBQUERY#6`.`b2`))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#5`.`c1`) and (`test`.`t1`.`a2` = `SUBQUERY#5`.`c2`))))))
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 t3a where c1 = a1) or
......@@ -392,25 +368,19 @@ where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL distinct_key # # # 5 0.00 #
1 PRIMARY SUBQUERY#5 eq_ref distinct_key # # # 1 100.00 #
1 PRIMARY t1 ALL NULL # # # 3 100.00 #
5 SUBQUERY t3 ALL NULL # # # 4 100.00 #
5 SUBQUERY SUBQUERY#6 eq_ref distinct_key # # # 1 100.00 #
6 SUBQUERY t2i index it2i2 # # # 5 100.00 #
2 SUBQUERY t2 ALL NULL # # # 5 100.00 #
4 SUBQUERY t3 ALL NULL # # # 4 100.00 #
3 SUBQUERY t3 ALL NULL # # # 4 100.00 #
7 UNION SUBQUERY#8 ALL distinct_key # # # 5 0.00 #
7 UNION SUBQUERY#9 eq_ref distinct_key # # # 1 100.00 #
7 UNION t1i ref it1i1,it1i2,it1i3 # # # 1 100.00 #
9 SUBQUERY t3i index it3i1,it3i2,it3i3 # # # 4 100.00 #
9 SUBQUERY SUBQUERY#10 eq_ref distinct_key # # # 1 100.00 #
7 UNION t1i index NULL # # # 3 100.00 #
9 SUBQUERY t3i index NULL # # # 4 100.00 #
10 SUBQUERY t2i index it2i2 # # # 5 100.00 #
8 SUBQUERY t2i index it2i1,it2i3 # # # 5 100.00 #
NULL UNION RESULT <union1,7> ALL NULL # # # NULL NULL #
Warnings:
Note 1003 (select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` where ((`SUBQUERY#6`.`b2` = `test`.`t3`.`c2`) and (`SUBQUERY#6`.`b1` = `test`.`t3`.`c1`))) join <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#3`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) group by `test`.`t2`.`b1`,`test`.`t2`.`b2`) join `test`.`t1` where ((`SUBQUERY#5`.`c2` = `SUBQUERY#2`.`b2`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`) and (`SUBQUERY#5`.`c1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`))) union (select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t3i`.`c1` AS `c1`,`test`.`t3i`.`c2` AS `c2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3i` where ((`SUBQUERY#10`.`b2` = `test`.`t3i`.`c2`) and (`SUBQUERY#10`.`b1` = `test`.`t3i`.`c1`))) join <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0')) join `test`.`t1i` where ((`SUBQUERY#9`.`c2` = `SUBQUERY#8`.`b2`) and (`test`.`t1i`.`a2` = `SUBQUERY#8`.`b2`) and (`SUBQUERY#9`.`c1` = `SUBQUERY#8`.`b1`) and (`test`.`t1i`.`a1` = `SUBQUERY#8`.`b1`)))
Note 1003 (select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#3`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) group by `test`.`t2`.`b1`,`test`.`t2`.`b2` ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`))))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `SUBQUERY#6`.`b1`) and (`test`.`t3`.`c2` = `SUBQUERY#6`.`b2`))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#5`.`c1`) and (`test`.`t1`.`a2` = `SUBQUERY#5`.`c2`))))))) union (select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` where (<in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `SUBQUERY#8`.`b1`) and (`test`.`t1i`.`a2` = `SUBQUERY#8`.`b2`))))) and <in_optimizer>((`test`.`t1i`.`a1`,`test`.`t1i`.`a2`),(`test`.`t1i`.`a1`,`test`.`t1i`.`a2`) in ( <materialize> (select `test`.`t3i`.`c1` AS `c1`,`test`.`t3i`.`c2` AS `c2` from `test`.`t3i` where <in_optimizer>((`test`.`t3i`.`c1`,`test`.`t3i`.`c2`),(`test`.`t3i`.`c1`,`test`.`t3i`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3i`.`c1` in <temporary table> on distinct_key where ((`test`.`t3i`.`c1` = `SUBQUERY#10`.`b1`) and (`test`.`t3i`.`c2` = `SUBQUERY#10`.`b2`))))) ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on distinct_key where ((`test`.`t1i`.`a1` = `SUBQUERY#9`.`c1`) and (`test`.`t1i`.`a2` = `SUBQUERY#9`.`c2`)))))))
(select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
......@@ -433,15 +403,13 @@ where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
1 PRIMARY SUBQUERY#4 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00
4 SUBQUERY SUBQUERY#5 eq_ref distinct_key distinct_key 18 test.t3.c1,test.t3.c2 1 100.00
4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
5 SUBQUERY t2i index it2i2 it2i3 18 NULL 5 100.00 Using where; Using index
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
3 DEPENDENT UNION t2 ALL NULL NULL NULL NULL 5 100.00 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` where ((`SUBQUERY#5`.`b2` = `test`.`t3`.`c2`) and (`SUBQUERY#5`.`b1` = `test`.`t3`.`c1`))) join `test`.`t1` where ((`SUBQUERY#4`.`c2` = `test`.`t1`.`a2`) and (`SUBQUERY#4`.`c1` = `test`.`t1`.`a1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where (<in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),(`test`.`t1`.`a1`,`test`.`t1`.`a2`) in ( <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `SUBQUERY#5`.`b1`) and (`test`.`t3`.`c2` = `SUBQUERY#5`.`b2`))))) ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on distinct_key where ((`test`.`t1`.`a1` = `SUBQUERY#4`.`c1`) and (`test`.`t1`.`a2` = `SUBQUERY#4`.`c2`))))))
select * from t1
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(a1, a2) in (select c1, c2 from t3
......@@ -457,16 +425,14 @@ where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
a1 = c1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
1 PRIMARY SUBQUERY#4 ALL distinct_key NULL NULL NULL 4 75.00 Using where; Using join buffer
1 PRIMARY t3 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer
4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00
4 SUBQUERY SUBQUERY#5 eq_ref distinct_key distinct_key 18 test.t3.c1,test.t3.c2 1 100.00
4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
5 SUBQUERY t2i index it2i2 it2i3 18 NULL 5 100.00 Using where; Using index
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
3 DEPENDENT UNION t2 ALL NULL NULL NULL NULL 5 100.00 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0')) join `test`.`t3` where ((`SUBQUERY#5`.`b2` = `test`.`t3`.`c2`) and (`SUBQUERY#5`.`b1` = `test`.`t3`.`c1`))) join `test`.`t1` join `test`.`t3` where ((`test`.`t3`.`c2` = `SUBQUERY#4`.`c2`) and (`SUBQUERY#4`.`c1` = `test`.`t1`.`a1`) and (`test`.`t3`.`c1` = `test`.`t1`.`a1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t1` join `test`.`t3` where ((`test`.`t3`.`c1` = `test`.`t1`.`a1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>((`test`.`t3`.`c1`,`test`.`t3`.`c2`),(`test`.`t3`.`c1`,`test`.`t3`.`c2`) in ( <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b2` > '0') ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `SUBQUERY#5`.`b1`) and (`test`.`t3`.`c2` = `SUBQUERY#5`.`b2`))))) ), <primary_index_lookup>(`test`.`t3`.`c1` in <temporary table> on distinct_key where ((`test`.`t3`.`c1` = `SUBQUERY#4`.`c1`) and (`test`.`t3`.`c2` = `SUBQUERY#4`.`c2`))))))
select * from t1, t3
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(c1, c2) in (select c1, c2 from t3
......@@ -585,7 +551,6 @@ a1 a2
Test that BLOBs are not materialized (except when arguments of some functions).
*/
# force materialization to be always considered
set @@optimizer_switch='semijoin=off';
set @prefix_len = 6;
set @blob_len = 16;
set @suffix_len = @blob_len - @prefix_len;
......@@ -644,11 +609,10 @@ explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 20 test.t1_16.a1 1 100.00 Using where
1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from <materialize> (select substr(`test`.`t2_16`.`b1`,1,16) AS `substring(b1,1,16)` from `test`.`t2_16` where (`test`.`t2_16`.`b1` > '0')) join `test`.`t1_16` where (`test`.`t1_16`.`a1` = `SUBQUERY#2`.`substring(b1,1,16)`)
Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` where <in_optimizer>(`test`.`t1_16`.`a1`,`test`.`t1_16`.`a1` in ( <materialize> (select substr(`test`.`t2_16`.`b1`,1,16) AS `substring(b1,1,16)` from `test`.`t2_16` where (`test`.`t2_16`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1_16`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_16`.`a1` = `SUBQUERY#2`.`substring(b1,1,16)`)))))
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');
......@@ -674,11 +638,10 @@ explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_16.a1 1 100.00 Using where
1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_16`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_16` group by `test`.`t2_16`.`b2`) join `test`.`t1_16` where (`test`.`t1_16`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` where <in_optimizer>(`test`.`t1_16`.`a1`,`test`.`t1_16`.`a1` in ( <materialize> (select group_concat(`test`.`t2_16`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_16` group by `test`.`t2_16`.`b2` ), <primary_index_lookup>(`test`.`t1_16`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_16`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)))))
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
......@@ -698,10 +661,9 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
2 DEPENDENT SUBQUERY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where
3 DEPENDENT SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using where
3 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using join buffer
3 DEPENDENT SUBQUERY SUBQUERY#4 eq_ref distinct_key distinct_key 9 test.t2.b1 1 100.00 Using where
4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>(concat(`test`.`t1`.`a1`,'x'),<exists>(select 1 AS `Not_used` from `test`.`t1_16` where (<in_optimizer>((`test`.`t1_16`.`a1`,`test`.`t1_16`.`a2`),<exists>(select `test`.`t2_16`.`b1` AS `b1`,`test`.`t2_16`.`b2` AS `b2` from <materialize> (select `test`.`t3`.`c1` AS `c1` from `test`.`t3` where (`test`.`t3`.`c2` > '0')) join `test`.`t2_16` join `test`.`t2` where ((`SUBQUERY#4`.`c1` = `test`.`t2`.`b1`) and (`test`.`t2`.`b2` = substr(`test`.`t2_16`.`b2`,1,6)) and (<cache>(`test`.`t1_16`.`a1`) = `test`.`t2_16`.`b1`) and (<cache>(`test`.`t1_16`.`a2`) = `test`.`t2_16`.`b2`)))) and (<cache>(concat(`test`.`t1`.`a1`,'x')) = left(`test`.`t1_16`.`a1`,8)))))
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>(concat(`test`.`t1`.`a1`,'x'),<exists>(select 1 AS `Not_used` from `test`.`t1_16` where (<in_optimizer>((`test`.`t1_16`.`a1`,`test`.`t1_16`.`a2`),<exists>(select `test`.`t2_16`.`b1` AS `b1`,`test`.`t2_16`.`b2` AS `b2` from `test`.`t2_16` join `test`.`t2` where ((`test`.`t2`.`b2` = substr(`test`.`t2_16`.`b2`,1,6)) and <in_optimizer>(`test`.`t2`.`b1`,`test`.`t2`.`b1` in ( <materialize> (select `test`.`t3`.`c1` AS `c1` from `test`.`t3` where (`test`.`t3`.`c2` > '0') ), <primary_index_lookup>(`test`.`t2`.`b1` in <temporary table> on distinct_key where ((`test`.`t2`.`b1` = `SUBQUERY#4`.`c1`))))) and (<cache>(`test`.`t1_16`.`a1`) = `test`.`t2_16`.`b1`) and (<cache>(`test`.`t1_16`.`a2`) = `test`.`t2_16`.`b2`)))) and (<cache>(concat(`test`.`t1`.`a1`,'x')) = left(`test`.`t1_16`.`a1`,8)))))
drop table t1_16, t2_16, t3_16;
set @blob_len = 512;
set @suffix_len = @blob_len - @prefix_len;
......@@ -760,11 +722,10 @@ explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 517 test.t1_512.a1 1 100.00 Using where
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from <materialize> (select substr(`test`.`t2_512`.`b1`,1,512) AS `substring(b1,1,512)` from `test`.`t2_512` where (`test`.`t2_512`.`b1` > '0')) join `test`.`t1_512` where (`test`.`t1_512`.`a1` = `SUBQUERY#2`.`substring(b1,1,512)`)
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where <in_optimizer>(`test`.`t1_512`.`a1`,`test`.`t1_512`.`a1` in ( <materialize> (select substr(`test`.`t2_512`.`b1`,1,512) AS `substring(b1,1,512)` from `test`.`t2_512` where (`test`.`t2_512`.`b1` > '0') ), <primary_index_lookup>(`test`.`t1_512`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_512`.`a1` = `SUBQUERY#2`.`substring(b1,1,512)`)))))
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');
......@@ -775,11 +736,10 @@ explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_512.a1 1 100.00 Using where
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_512`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_512` group by `test`.`t2_512`.`b2`) join `test`.`t1_512` where (`test`.`t1_512`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where <in_optimizer>(`test`.`t1_512`.`a1`,`test`.`t1_512`.`a1` in ( <materialize> (select group_concat(`test`.`t2_512`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_512` group by `test`.`t2_512`.`b2` ), <primary_index_lookup>(`test`.`t1_512`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_512`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)))))
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
......@@ -789,11 +749,10 @@ explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_512.a1 1 100.00 Using where
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_512`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_512` group by `test`.`t2_512`.`b2`) join `test`.`t1_512` where (`test`.`t1_512`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` where <in_optimizer>(`test`.`t1_512`.`a1`,`test`.`t1_512`.`a1` in ( <materialize> (select group_concat(`test`.`t2_512`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_512` group by `test`.`t2_512`.`b2` ), <primary_index_lookup>(`test`.`t1_512`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_512`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)))))
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
......@@ -859,7 +818,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00 Using where
2 DEPENDENT SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where <in_optimizer>(`test`.`t1_1024`.`a1`,<exists>(select 1 AS `Not_used` from `test`.`t2_1024` where ((`test`.`t2_1024`.`b1` > '0') and (<cache>(`test`.`t1_1024`.`a1`) = substr(`test`.`t2_1024`.`b1`,1,1024)) and (<cache>(`test`.`t1_1024`.`a1`) = 1))))
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where <in_optimizer>(`test`.`t1_1024`.`a1`,`test`.`t1_1024`.`a1` in (select 1 AS `Not_used` from `test`.`t2_1024` where ((`test`.`t2_1024`.`b1` > '0') and (<cache>(`test`.`t1_1024`.`a1`) = substr(`test`.`t2_1024`.`b1`,1,1024)))))
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0');
......@@ -870,11 +829,10 @@ explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_1024.a1 1 100.00 Using where
1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_1024`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1024` group by `test`.`t2_1024`.`b2`) join `test`.`t1_1024` where (`test`.`t1_1024`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where <in_optimizer>(`test`.`t1_1024`.`a1`,`test`.`t1_1024`.`a1` in ( <materialize> (select group_concat(`test`.`t2_1024`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1024` group by `test`.`t2_1024`.`b2` ), <primary_index_lookup>(`test`.`t1_1024`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_1024`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)))))
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
......@@ -884,11 +842,10 @@ explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_1024.a1 1 100.00 Using where
1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_1024`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1024` group by `test`.`t2_1024`.`b2`) join `test`.`t1_1024` where (`test`.`t1_1024`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` where <in_optimizer>(`test`.`t1_1024`.`a1`,`test`.`t1_1024`.`a1` in ( <materialize> (select group_concat(`test`.`t2_1024`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1024` group by `test`.`t2_1024`.`b2` ), <primary_index_lookup>(`test`.`t1_1024`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_1024`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)))))
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
......@@ -954,7 +911,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00 Using where
2 DEPENDENT SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where <in_optimizer>(`test`.`t1_1025`.`a1`,<exists>(select 1 AS `Not_used` from `test`.`t2_1025` where ((`test`.`t2_1025`.`b1` > '0') and (<cache>(`test`.`t1_1025`.`a1`) = substr(`test`.`t2_1025`.`b1`,1,1025)) and (<cache>(`test`.`t1_1025`.`a1`) = 1))))
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where <in_optimizer>(`test`.`t1_1025`.`a1`,`test`.`t1_1025`.`a1` in (select 1 AS `Not_used` from `test`.`t2_1025` where ((`test`.`t2_1025`.`b1` > '0') and (<cache>(`test`.`t1_1025`.`a1`) = substr(`test`.`t2_1025`.`b1`,1,1025)))))
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0');
......@@ -965,11 +922,10 @@ explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_1025.a1 1 100.00 Using where
1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_1025`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1025` group by `test`.`t2_1025`.`b2`) join `test`.`t1_1025` where (`test`.`t1_1025`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where <in_optimizer>(`test`.`t1_1025`.`a1`,`test`.`t1_1025`.`a1` in ( <materialize> (select group_concat(`test`.`t2_1025`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1025` group by `test`.`t2_1025`.`b2` ), <primary_index_lookup>(`test`.`t1_1025`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_1025`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)))))
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
......@@ -979,11 +935,10 @@ explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_1025.a1 1 100.00 Using where
1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_1025`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1025` group by `test`.`t2_1025`.`b2`) join `test`.`t1_1025` where (`test`.`t1_1025`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` where <in_optimizer>(`test`.`t1_1025`.`a1`,`test`.`t1_1025`.`a1` in ( <materialize> (select group_concat(`test`.`t2_1025`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1025` group by `test`.`t2_1025`.`b2` ), <primary_index_lookup>(`test`.`t1_1025`.`a1` in <temporary table> on distinct_key where ((`test`.`t1_1025`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)))))
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
......@@ -997,16 +952,14 @@ insert into t1bit values (b'010', b'110');
insert into t2bit values (b'001', b'101');
insert into t2bit values (b'010', b'110');
insert into t2bit values (b'110', b'111');
set @@optimizer_switch='semijoin=off';
explain extended select bin(a1), bin(a2)
from t1bit
where (a1, a2) in (select b1, b2 from t2bit);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1bit ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 10 test.t1bit.a1,test.t1bit.a2 1 100.00 Using where
1 PRIMARY t1bit ALL NULL NULL NULL NULL 3 100.00 Using where
2 SUBQUERY t2bit ALL NULL NULL NULL NULL 3 100.00
Warnings:
Note 1003 select conv(`test`.`t1bit`.`a1`,10,2) AS `bin(a1)`,conv(`test`.`t1bit`.`a2`,10,2) AS `bin(a2)` from <materialize> (select `test`.`t2bit`.`b1` AS `b1`,`test`.`t2bit`.`b2` AS `b2` from `test`.`t2bit`) join `test`.`t1bit` where ((`test`.`t1bit`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1bit`.`a2` = `SUBQUERY#2`.`b2`))
Note 1003 select conv(`test`.`t1bit`.`a1`,10,2) AS `bin(a1)`,conv(`test`.`t1bit`.`a2`,10,2) AS `bin(a2)` from `test`.`t1bit` where <in_optimizer>((`test`.`t1bit`.`a1`,`test`.`t1bit`.`a2`),(`test`.`t1bit`.`a1`,`test`.`t1bit`.`a2`) in ( <materialize> (select `test`.`t2bit`.`b1` AS `b1`,`test`.`t2bit`.`b2` AS `b2` from `test`.`t2bit` ), <primary_index_lookup>(`test`.`t1bit`.`a1` in <temporary table> on distinct_key where ((`test`.`t1bit`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t1bit`.`a2` = `SUBQUERY#2`.`b2`)))))
select bin(a1), bin(a2)
from t1bit
where (a1, a2) in (select b1, b2 from t2bit);
......@@ -1041,7 +994,7 @@ drop table t1, t2, t3, t1i, t2i, t3i, columns;
/******************************************************************************
* Test the cache of the left operand of IN.
******************************************************************************/
set @@optimizer_switch='semijoin=off';
# Test that default values of Cached_item are not used for comparison
create table t1 (s1 int);
create table t2 (s2 int);
insert into t1 values (5),(1),(0);
......@@ -1074,11 +1027,10 @@ insert into t3 values (30);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 7 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 4 test.t1.a 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 7 100.00 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20)) join `test`.`t1` where (`SUBQUERY#2`.`c` = `test`.`t1`.`a`)
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `SUBQUERY#2`.`c`)))))
select a from t1 where a in (select c from t2 where d >= 20);
a
2
......@@ -1089,11 +1041,10 @@ create index it1a on t1(a);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index it1a it1a 4 NULL 7 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 4 test.t1.a 1 100.00
1 PRIMARY t1 index NULL it1a 4 NULL 7 100.00 Using where; Using index
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20)) join `test`.`t1` where (`SUBQUERY#2`.`c` = `test`.`t1`.`a`)
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `SUBQUERY#2`.`c`)))))
select a from t1 where a in (select c from t2 where d >= 20);
a
2
......@@ -1104,11 +1055,10 @@ insert into t2 values (1,10);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index it1a it1a 4 NULL 7 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 4 test.t1.a 1 100.00
1 PRIMARY t1 index NULL it1a 4 NULL 7 100.00 Using where; Using index
2 SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20)) join `test`.`t1` where (`SUBQUERY#2`.`c` = `test`.`t1`.`a`)
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `SUBQUERY#2`.`c`)))))
select a from t1 where a in (select c from t2 where d >= 20);
a
2
......@@ -1188,12 +1138,11 @@ create table t2 (b1 int);
insert into t1 values (5);
explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY SUBQUERY#2 const distinct_key distinct_key 5 const 1
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
min(a1)
NULL
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='default,materialization=off';
explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
id select_type table type possible_keys key key_len ref rows Extra
......@@ -1204,12 +1153,10 @@ min(a1)
set @@optimizer_switch='default,semijoin=off';
explain select min(a1) from t1 where 7 in (select b1 from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY SUBQUERY#2 const distinct_key distinct_key 5 const 1
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
select min(a1) from t1 where 7 in (select b1 from t2);
min(a1)
NULL
set @@optimizer_switch='default,materialization=off';
# with MariaDB and MWL#90, this particular case is solved:
explain select min(a1) from t1 where 7 in (select b1 from t2);
......@@ -1225,15 +1172,14 @@ id select_type table type possible_keys key key_len ref rows Extra
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
min(a1)
set @@optimizer_switch= @save_optimizer_switch;
drop table t1,t2;
create table t1 (a char(2), b varchar(10));
insert into t1 values ('a', 'aaa');
insert into t1 values ('aa', 'aaaa');
set @@optimizer_switch='default,semijoin=off';
explain select a,b from t1 where b in (select a from t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 3 test.t1.b 1 Using where
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
select a,b from t1 where b in (select a from t1);
a b
......@@ -1250,6 +1196,7 @@ INSERT INTO t1 (f1, f2) VALUES (10, 1.668);
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1, 1.789);
INSERT INTO t2 VALUES (13, 1.454);
set @save_optimizer_switch=@@optimizer_switch;
SET @@optimizer_switch='default,semijoin=on,materialization=on';
EXPLAIN SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
......@@ -1259,6 +1206,7 @@ id select_type table type possible_keys key key_len ref rows Extra
SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
COUNT(*)
2
set @@optimizer_switch= @save_optimizer_switch;
DROP TABLE t1, t2;
CREATE TABLE t1 (
pk int,
......@@ -1271,6 +1219,7 @@ PRIMARY KEY (pk)
INSERT INTO t1 VALUES (1,'o','ffff','ffff','ffoo'),(2,'f','ffff','ffff','ffff');
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1,'i','iiii','iiii','iiii'),(2,'f','ffff','ffff','ffff');
set @save_optimizer_switch=@@optimizer_switch;
SET @@optimizer_switch='default,semijoin=on,materialization=on';
EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
id select_type table type possible_keys key key_len ref rows Extra
......@@ -1284,6 +1233,7 @@ SELECT pk FROM t1 WHERE (b,c,d) IN (SELECT b,c,d FROM t2 WHERE pk > 0);
pk
2
DROP TABLE t1, t2;
set optimizer_switch=@save_optimizer_switch;
#
# BUG#50019: Wrong result for IN-subquery with materialization
#
......@@ -1335,3 +1285,5 @@ a a in (select a from t1)
1 0
2 0
drop table t0, t1;
set optimizer_switch='firstmatch=on';
set @@optimizer_switch=default;
mysql-test/r/subselect_no_semijoin.result
View file @ 62bf7f61
......@@ -1299,34 +1299,31 @@ a
4
explain extended select * from t2 where t2.a in (select a from t1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL distinct_key NULL NULL NULL 4 100.00
1 PRIMARY t2 index PRIMARY PRIMARY 4 NULL 4 75.00 Using where; Using index; Using join buffer
1 PRIMARY t2 index NULL PRIMARY 4 NULL 4 100.00 Using where; Using index
2 SUBQUERY t1 index NULL PRIMARY 4 NULL 4 100.00 Using index
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1`) join `test`.`t2` where (`test`.`t2`.`a` = `SUBQUERY#2`.`a`)
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `SUBQUERY#2`.`a`)))))
select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
a
2
4
explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL distinct_key NULL NULL NULL 4 100.00
1 PRIMARY t2 index PRIMARY PRIMARY 4 NULL 4 75.00 Using where; Using index; Using join buffer
1 PRIMARY t2 index NULL PRIMARY 4 NULL 4 100.00 Using where; Using index
2 SUBQUERY t1 ALL NULL NULL NULL NULL 4 100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30)) join `test`.`t2` where (`test`.`t2`.`a` = `SUBQUERY#2`.`a`)
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30) ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `SUBQUERY#2`.`a`)))))
select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
a
2
3
explain extended select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 index PRIMARY PRIMARY 4 NULL 4 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 4 test.t2.a 1 100.00
1 PRIMARY t2 index NULL PRIMARY 4 NULL 4 100.00 Using where; Using index
2 SUBQUERY t3 index PRIMARY PRIMARY 4 NULL 3 100.00 Using index
2 SUBQUERY t1 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t3` where (`test`.`t1`.`b` = `test`.`t3`.`a`)) join `test`.`t2` where (`SUBQUERY#2`.`a` = `test`.`t2`.`a`)
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t3` where (`test`.`t1`.`b` = `test`.`t3`.`a`) ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `SUBQUERY#2`.`a`)))))
drop table t1, t2, t3;
create table t1 (a int, b int, index a (a,b));
create table t2 (a int, index a (a));
......@@ -1345,34 +1342,31 @@ a
4
explain extended select * from t2 where t2.a in (select a from t1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 index a a 5 NULL 4 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 5 test.t2.a 1 100.00
1 PRIMARY t2 index NULL a 5 NULL 4 100.00 Using where; Using index
2 SUBQUERY t1 index NULL a 10 NULL 10004 100.00 Using index
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1`) join `test`.`t2` where (`SUBQUERY#2`.`a` = `test`.`t2`.`a`)
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `SUBQUERY#2`.`a`)))))
select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
a
2
4
explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 index a a 5 NULL 4 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 5 test.t2.a 1 100.00
1 PRIMARY t2 index NULL a 5 NULL 4 100.00 Using where; Using index
2 SUBQUERY t1 index NULL a 10 NULL 10004 100.00 Using where; Using index
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30)) join `test`.`t2` where (`SUBQUERY#2`.`a` = `test`.`t2`.`a`)
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30) ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `SUBQUERY#2`.`a`)))))
select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
a
2
3
explain extended select * from t2 where t2.a in (select t1.a from t1,t3 where t1.b=t3.a);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 index a a 5 NULL 4 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 5 test.t2.a 1 100.00
1 PRIMARY t2 index NULL a 5 NULL 4 100.00 Using where; Using index
2 SUBQUERY t3 index a a 5 NULL 3 100.00 Using index
2 SUBQUERY t1 index NULL a 10 NULL 10004 100.00 Using where; Using index; Using join buffer
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t3` where (`test`.`t1`.`b` = `test`.`t3`.`a`)) join `test`.`t2` where (`SUBQUERY#2`.`a` = `test`.`t2`.`a`)
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` join `test`.`t3` where (`test`.`t1`.`b` = `test`.`t3`.`a`) ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `SUBQUERY#2`.`a`)))))
insert into t1 values (3,31);
select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
a
......@@ -1385,11 +1379,10 @@ a
4
explain extended select * from t2 where t2.a in (select a from t1 where t1.b <> 30);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 index a a 5 NULL 4 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 5 test.t2.a 1 100.00
1 PRIMARY t2 index NULL a 5 NULL 4 100.00 Using where; Using index
2 SUBQUERY t1 index NULL a 10 NULL 10005 100.00 Using where; Using index
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30)) join `test`.`t2` where (`SUBQUERY#2`.`a` = `test`.`t2`.`a`)
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`b` <> 30) ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on distinct_key where ((`test`.`t2`.`a` = `SUBQUERY#2`.`a`)))))
drop table t0, t1, t2, t3;
create table t1 (a int, b int);
create table t2 (a int, b int);
......@@ -2840,11 +2833,10 @@ Warnings:
Note 1003 select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two`,<in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),<exists>(select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where ((`test`.`t2`.`flag` = '0') and trigcond(((<cache>(`test`.`t1`.`one`) = `test`.`t2`.`one`) or isnull(`test`.`t2`.`one`))) and trigcond(((<cache>(`test`.`t1`.`two`) = `test`.`t2`.`two`) or isnull(`test`.`t2`.`two`)))) having (trigcond(<is_not_null_test>(`test`.`t2`.`one`)) and trigcond(<is_not_null_test>(`test`.`t2`.`two`))))) AS `test` from `test`.`t1`
explain extended SELECT one,two from t1 where ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = 'N');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 10 test.t1.one,test.t1.two 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 100.00 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 9 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two` from <materialize> (select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where (`test`.`t2`.`flag` = 'N')) join `test`.`t1` where ((`SUBQUERY#2`.`two` = `test`.`t1`.`two`) and (`SUBQUERY#2`.`one` = `test`.`t1`.`one`))
Note 1003 select `test`.`t1`.`one` AS `one`,`test`.`t1`.`two` AS `two` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`one`,`test`.`t1`.`two`),(`test`.`t1`.`one`,`test`.`t1`.`two`) in ( <materialize> (select `test`.`t2`.`one` AS `one`,`test`.`t2`.`two` AS `two` from `test`.`t2` where (`test`.`t2`.`flag` = 'N') ), <primary_index_lookup>(`test`.`t1`.`one` in <temporary table> on distinct_key where ((`test`.`t1`.`one` = `SUBQUERY#2`.`one`) and (`test`.`t1`.`two` = `SUBQUERY#2`.`two`)))))
explain extended SELECT one,two,ROW(one,two) IN (SELECT one,two FROM t2 WHERE flag = '0' group by one,two) as 'test' from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 100.00
......@@ -3429,8 +3421,7 @@ AAA 8
EXPLAIN
SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 9
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 23 test.t1.a,test.t1.b 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 9 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 9 Using temporary; Using filesort
ALTER TABLE t1 ADD INDEX(a);
SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a);
......@@ -3441,8 +3432,7 @@ AAA 8
EXPLAIN
SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL a NULL NULL NULL 9
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 23 test.t1.a,test.t1.b 1
1 PRIMARY t1 ALL NULL NULL NULL NULL 9 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 9 Using temporary; Using filesort
DROP TABLE t1;
create table t1( f1 int,f2 int);
......@@ -4216,8 +4206,7 @@ CREATE INDEX I1 ON t1 (a);
CREATE INDEX I2 ON t1 (b);
EXPLAIN SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL I2 NULL NULL NULL 2
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 2 test.t1.b 1 Using where
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY t1 index NULL I1 2 NULL 2 Using index
SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1);
a b
......@@ -4227,16 +4216,14 @@ CREATE INDEX I1 ON t2 (a);
CREATE INDEX I2 ON t2 (b);
EXPLAIN SELECT a,b FROM t2 WHERE b IN (SELECT a FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL I2 NULL NULL NULL 2
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 5 test.t2.b 1 Using where
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY t2 index NULL I1 4 NULL 2 Using index
SELECT a,b FROM t2 WHERE b IN (SELECT a FROM t2);
a b
EXPLAIN
SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1 WHERE LENGTH(a)<500);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL I2 NULL NULL NULL 2
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 2 test.t1.b 1 Using where
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 SUBQUERY t1 index NULL I1 2 NULL 2 Using where; Using index
SELECT a,b FROM t1 WHERE b IN (SELECT a FROM t1 WHERE LENGTH(a)<500);
a b
......@@ -4339,18 +4326,16 @@ CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT 1 FROM t1 GROUP BY a);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00
1 PRIMARY SUBQUERY#2 const distinct_key distinct_key 4 const 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
Warnings:
Note 1003 select 1 AS `1` from <materialize> (select 1 AS `1` from `test`.`t1` group by `test`.`t1`.`a`) join `test`.`t1` where (`SUBQUERY#2`.`1` = 1)
Note 1003 select 1 AS `1` from `test`.`t1` where <in_optimizer>(1,1 in ( <materialize> (select 1 AS `1` from `test`.`t1` group by `test`.`t1`.`a` ), <primary_index_lookup>(1 in <temporary table> on distinct_key where ((1 = `SUBQUERY#2`.`1`)))))
EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE 1 IN (SELECT 1 FROM t1 WHERE a > 3 GROUP BY a);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00
1 PRIMARY SUBQUERY#2 const distinct_key distinct_key 4 const 1 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003 select 1 AS `1` from <materialize> (select 1 AS `1` from `test`.`t1` where (`test`.`t1`.`a` > 3) group by `test`.`t1`.`a`) join `test`.`t1` where (`SUBQUERY#2`.`1` = 1)
Note 1003 select 1 AS `1` from `test`.`t1` where <in_optimizer>(1,1 in ( <materialize> (select 1 AS `1` from `test`.`t1` where (`test`.`t1`.`a` > 3) group by `test`.`t1`.`a` ), <primary_index_lookup>(1 in <temporary table> on distinct_key where ((1 = `SUBQUERY#2`.`1`)))))
DROP TABLE t1;
#
# Bug#45061: Incorrectly market field caused wrong result.
......
mysql-test/r/subselect_sj_mat.result 0 → 100644
View file @ 62bf7f61
set optimizer_switch='firstmatch=off';
drop table if exists t1, t2, t3, t1i, t2i, t3i;
drop view if exists v1, v2, v1m, v2m;
create table t1 (a1 char(8), a2 char(8));
create table t2 (b1 char(8), b2 char(8));
create table t3 (c1 char(8), c2 char(8));
insert into t1 values ('1 - 00', '2 - 00');
insert into t1 values ('1 - 01', '2 - 01');
insert into t1 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 01', '2 - 01');
insert into t2 values ('1 - 01', '2 - 01');
insert into t2 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 03', '2 - 03');
insert into t3 values ('1 - 01', '2 - 01');
insert into t3 values ('1 - 02', '2 - 02');
insert into t3 values ('1 - 03', '2 - 03');
insert into t3 values ('1 - 04', '2 - 04');
create table t1i (a1 char(8), a2 char(8));
create table t2i (b1 char(8), b2 char(8));
create table t3i (c1 char(8), c2 char(8));
create index it1i1 on t1i (a1);
create index it1i2 on t1i (a2);
create index it1i3 on t1i (a1, a2);
create index it2i1 on t2i (b1);
create index it2i2 on t2i (b2);
create index it2i3 on t2i (b1, b2);
create index it3i1 on t3i (c1);
create index it3i2 on t3i (c2);
create index it3i3 on t3i (c1, c2);
insert into t1i select * from t1;
insert into t2i select * from t2;
insert into t3i select * from t3;
/******************************************************************************
* Simple tests.
******************************************************************************/
# non-indexed nullable fields
explain extended
select * from t1 where a1 in (select b1 from t2 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 9 func 1 1.00
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`b1` > '0'))
select * from t1 where a1 in (select b1 from t2 where b1 > '0');
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 9 test.t1.a1 1 100.00
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2`.`b1` AS `b1` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`) join `test`.`t1` where (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`)
select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`,`test`.`t2`.`b2`) join `test`.`t1` where ((`SUBQUERY#2`.`b2` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using temporary; Using filesort
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2`.`b1` AS `b1`,min(`test`.`t2`.`b2`) AS `min(b2)` from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1`) join `test`.`t1` where ((`SUBQUERY#2`.`min(b2)` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1i where a1 in (select b1 from t2i where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2i index it2i1,it2i3 it2i1 9 NULL 5 50.00 Using where; Using index; LooseScan
1 PRIMARY t1i ref it1i1,it1i3 it1i3 9 test.t2i.b1 1 100.00 Using index
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` semi join (`test`.`t2i`) where ((`test`.`t1i`.`a1` = `test`.`t2i`.`b1`) and (`test`.`t2i`.`b1` > '0'))
select * from t1i where a1 in (select b1 from t2i where b1 > '0');
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL distinct_key # NULL # 3 100.00 #
1 PRIMARY t1i ref it1i1,it1i3 # 9 # 1 100.00 #
2 SUBQUERY t2i range it2i1,it2i3 # 9 # 3 100.00 #
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`) join `test`.`t1i` where (`test`.`t1i`.`a1` = `SUBQUERY#2`.`b1`)
select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 50.00 Using where; Using index; LooseScan
1 PRIMARY t1i ref it1i1,it1i2,it1i3 it1i3 18 test.t2i.b1,test.t2i.b2 1 100.00 Using index
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` semi join (`test`.`t2i`) where ((`test`.`t1i`.`a2` = `test`.`t2i`.`b2`) and (`test`.`t1i`.`a1` = `test`.`t2i`.`b1`) and (`test`.`t2i`.`b1` > '0'))
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1i index it1i1,it1i2,it1i3 # # # 3 100.00 #
1 PRIMARY SUBQUERY#2 eq_ref distinct_key # # # 1 100.00 #
2 SUBQUERY t2i range it2i1,it2i3 # # # 3 100.00 #
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`,`test`.`t2i`.`b2`) join `test`.`t1i` where ((`SUBQUERY#2`.`b2` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1i index it1i1,it1i2,it1i3 # # # 3 100.00 #
1 PRIMARY SUBQUERY#2 eq_ref distinct_key # # # 1 100.00 #
2 SUBQUERY t2i range it2i1,it2i3 # # # 3 100.00 #
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,min(`test`.`t2i`.`b2`) AS `min(b2)` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`) join `test`.`t1i` where ((`SUBQUERY#2`.`min(b2)` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
2 SUBQUERY t2i range NULL it2i3 9 NULL 3 100.00 Using index for group-by
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,max(`test`.`t2i`.`b2`) AS `max(b2)` from `test`.`t2i` group by `test`.`t2i`.`b1`) join `test`.`t1` where ((`SUBQUERY#2`.`max(b2)` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
prepare st1 from "explain select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)";
execute st1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1
2 SUBQUERY t2i range NULL it2i3 9 NULL 3 Using index for group-by
execute st1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1
2 SUBQUERY t2i range NULL it2i3 9 NULL 3 Using index for group-by
prepare st2 from "select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)";
execute st2;
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
execute st2;
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
2 SUBQUERY t2i range it2i1,it2i3 it2i3 18 NULL 3 100.00 Using where; Using index for group-by
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,min(`test`.`t2i`.`b2`) AS `min(b2)` from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1`) join `test`.`t1` where ((`SUBQUERY#2`.`min(b2)` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i limit 1,1);
ERROR 42000: This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='default,semijoin=off';
prepare st1 from
"select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1)";
set @@optimizer_switch='default,materialization=off';
execute st1;
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
set @@optimizer_switch='default,semijoin=off';
execute st1;
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
set @@optimizer_switch='default,materialization=off';
prepare st1 from
"select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1)";
set @@optimizer_switch='default,semijoin=off';
execute st1;
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
set @@optimizer_switch='default,materialization=off';
execute st1;
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
set @@optimizer_switch=@save_optimizer_switch;
explain extended
select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1.a1,test.t1.a2 1 100.00
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` order by `test`.`t2`.`b1`,`test`.`t2`.`b2`) join `test`.`t1` where ((`SUBQUERY#2`.`b2` = `test`.`t1`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1`.`a1`))
select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1i index it1i1,it1i2,it1i3 it1i3 18 NULL 3 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 18 test.t1i.a1,test.t1i.a2 1 100.00
2 SUBQUERY t2i index NULL it2i3 18 NULL 5 100.00 Using index
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from <materialize> (select `test`.`t2i`.`b1` AS `b1`,`test`.`t2i`.`b2` AS `b2` from `test`.`t2i` order by `test`.`t2i`.`b1`,`test`.`t2i`.`b2`) join `test`.`t1i` where ((`SUBQUERY#2`.`b2` = `test`.`t1i`.`a2`) and (`SUBQUERY#2`.`b1` = `test`.`t1i`.`a1`))
select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
/******************************************************************************
* Views, UNIONs, several levels of nesting.
******************************************************************************/
# materialize the result of subquery over temp-table view
create algorithm=merge view v1 as
select b1, c2 from t2, t3 where b2 > c2;
create algorithm=merge view v2 as
select b1, c2 from t2, t3 group by b2, c2;
Warnings:
Warning 1354 View merge algorithm can't be used here for now (assumed undefined algorithm)
create algorithm=temptable view v1m as
select b1, c2 from t2, t3 where b2 > c2;
create algorithm=temptable view v2m as
select b1, c2 from t2, t3 group by b2, c2;
select * from v1 where (c2, b1) in (select c2, b1 from v2 where b1 is not null);
b1 c2
1 - 02 2 - 01
1 - 02 2 - 01
1 - 03 2 - 01
1 - 03 2 - 02
select * from v1 where (c2, b1) in (select distinct c2, b1 from v2 where b1 is not null);
b1 c2
1 - 02 2 - 01
1 - 02 2 - 01
1 - 03 2 - 01
1 - 03 2 - 02
select * from v1m where (c2, b1) in (select c2, b1 from v2m where b1 is not null);
b1 c2
1 - 02 2 - 01
1 - 02 2 - 01
1 - 03 2 - 01
1 - 03 2 - 02
select * from v1m where (c2, b1) in (select distinct c2, b1 from v2m where b1 is not null);
b1 c2
1 - 02 2 - 01
1 - 02 2 - 01
1 - 03 2 - 01
1 - 03 2 - 02
drop view v1, v2, v1m, v2m;
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2 where b1 > '0') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 18 func 1 1.00
1 PRIMARY SUBQUERY#3 eq_ref unique_key unique_key 18 func 1 1.00
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where
3 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
3 SUBQUERY t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) semi join (`test`.`t2i` join `test`.`t3`) where ((`test`.`t2i`.`b2` = `test`.`t3`.`c2`) and (`test`.`t2i`.`b1` = `test`.`t3`.`c1`) and (`test`.`t2`.`b1` > '0') and (`test`.`t3`.`c2` > '0'))
select * from t1
where (a1, a2) in (select b1, b2 from t2 where b1 > '0') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1i index it1i1,it1i2,it1i3 # # # 3 100.00 #
1 PRIMARY SUBQUERY#2 eq_ref unique_key # # # 1 1.00 #
1 PRIMARY SUBQUERY#3 eq_ref unique_key # # # 1 1.00 #
2 SUBQUERY t2i index it2i1,it2i2,it2i3 # # # 5 100.00 #
3 SUBQUERY t2i index it2i1,it2i2,it2i3 # # # 5 100.00 #
3 SUBQUERY t3i index it3i1,it3i2,it3i3 # # # 4 75.00 #
Warnings:
Note 1003 select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` semi join (`test`.`t2i`) semi join (`test`.`t2i` join `test`.`t3i`) where ((`test`.`t3i`.`c2` = `test`.`t2i`.`b2`) and (`test`.`t3i`.`c1` = `test`.`t2i`.`b1`) and (`test`.`t2i`.`b1` > '0') and (`test`.`t2i`.`b2` > '0'))
select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 18 func 1 1.00
1 PRIMARY SUBQUERY#5 eq_ref unique_key unique_key 18 func 1 1.00
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where
5 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
5 SUBQUERY t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer
4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
3 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) semi join (`test`.`t2i` join `test`.`t3`) where ((`test`.`t2i`.`b2` = `test`.`t3`.`c2`) and (`test`.`t2i`.`b1` = `test`.`t3`.`c1`) and (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#3`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) and (`test`.`t3`.`c2` > '0'))
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
a1 a2
1 - 02 2 - 02
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 t3a where c1 = a1) or
b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3 t3c
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Start temporary
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer
1 PRIMARY SUBQUERY#5 eq_ref unique_key unique_key 18 func 1 1.00
5 SUBQUERY t3c ALL NULL NULL NULL NULL 4 100.00 Using where
5 SUBQUERY t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer
4 SUBQUERY t3b ALL NULL NULL NULL NULL 4 100.00 Using where
3 DEPENDENT SUBQUERY t3a ALL NULL NULL NULL NULL 4 100.00 Using where
Warnings:
Note 1276 Field or reference 'test.t1.a1' of SELECT #3 was resolved in SELECT #1
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) semi join (`test`.`t2i` join `test`.`t3` `t3c`) where ((`test`.`t2`.`b2` = `test`.`t1`.`a2`) and (`test`.`t2i`.`b2` = `test`.`t3c`.`c2`) and (`test`.`t2`.`b1` = `test`.`t1`.`a1`) and (`test`.`t2i`.`b1` = `test`.`t3c`.`c1`) and (<in_optimizer>(`test`.`t2`.`b2`,<exists>(select 1 AS `Not_used` from `test`.`t3` `t3a` where ((`test`.`t3a`.`c1` = `test`.`t1`.`a1`) and (<cache>(`test`.`t2`.`b2`) = `test`.`t3a`.`c2`)))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3b`.`c2` AS `c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) and (`test`.`t3c`.`c2` > '0'))
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 t3a where c1 = a1) or
b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3 t3c
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
(select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')
group by b1, b2) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')))
UNION
(select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL distinct_key # # # 5 0.00 #
1 PRIMARY t3 ALL NULL # # # 4 100.00 #
1 PRIMARY t1 ALL NULL # # # 3 100.00 #
1 PRIMARY t2i ref it2i1,it2i2,it2i3 # # # 2 100.00 #
2 SUBQUERY t2 ALL NULL # # # 5 100.00 #
4 SUBQUERY t3 ALL NULL # # # 4 100.00 #
3 SUBQUERY t3 ALL NULL # # # 4 100.00 #
7 UNION t1i index it1i1,it1i2,it1i3 # # # 3 100.00 #
7 UNION SUBQUERY#8 eq_ref unique_key # # # 1 1.00 #
7 UNION SUBQUERY#9 eq_ref unique_key # # # 1 1.00 #
8 SUBQUERY t2i index it2i1,it2i2,it2i3 # # # 5 100.00 #
9 SUBQUERY t2i index it2i1,it2i2,it2i3 # # # 5 100.00 #
9 SUBQUERY t3i index it3i1,it3i2,it3i3 # # # 4 75.00 #
NULL UNION RESULT <union1,7> ALL NULL # # # NULL NULL #
Warnings:
Note 1003 (select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from <materialize> (select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#3`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3`.`c2` AS `c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))) group by `test`.`t2`.`b1`,`test`.`t2`.`b2`) semi join (`test`.`t2i` join `test`.`t3`) join `test`.`t1` where ((`test`.`t3`.`c2` = `SUBQUERY#2`.`b2`) and (`test`.`t1`.`a2` = `SUBQUERY#2`.`b2`) and (`test`.`t2i`.`b2` = `SUBQUERY#2`.`b2`) and (`test`.`t3`.`c1` = `SUBQUERY#2`.`b1`) and (`test`.`t1`.`a1` = `SUBQUERY#2`.`b1`) and (`test`.`t2i`.`b1` = `SUBQUERY#2`.`b1`) and (`SUBQUERY#2`.`b2` > '0'))) union (select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` semi join (`test`.`t2i`) semi join (`test`.`t2i` join `test`.`t3i`) where ((`test`.`t3i`.`c2` = `test`.`t2i`.`b2`) and (`test`.`t3i`.`c1` = `test`.`t2i`.`b1`) and (`test`.`t2i`.`b1` > '0') and (`test`.`t2i`.`b2` > '0')))
(select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')
group by b1, b2) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')))
UNION
(select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')));
a1 a2
1 - 02 2 - 02
1 - 01 2 - 01
explain extended
select * from t1
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
1 PRIMARY SUBQUERY#4 eq_ref unique_key unique_key 18 func 1 1.00
4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
4 SUBQUERY t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
3 DEPENDENT UNION t2 ALL NULL NULL NULL NULL 5 100.00 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2i` join `test`.`t3`) where ((`test`.`t2i`.`b2` = `test`.`t3`.`c2`) and (`test`.`t2i`.`b1` = `test`.`t3`.`c1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and (`test`.`t3`.`c2` > '0'))
select * from t1
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
a1 a2
1 - 01 2 - 01
1 - 02 2 - 02
explain extended
select * from t1, t3
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(c1, c2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
a1 = c1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
1 PRIMARY t3 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer
1 PRIMARY SUBQUERY#4 eq_ref unique_key unique_key 18 func 1 1.00
4 SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
4 SUBQUERY t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
3 DEPENDENT UNION t2 ALL NULL NULL NULL NULL 5 100.00 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t1` semi join (`test`.`t2i` join `test`.`t3`) join `test`.`t3` where ((`test`.`t2i`.`b2` = `test`.`t3`.`c2`) and (`test`.`t3`.`c1` = `test`.`t1`.`a1`) and (`test`.`t2i`.`b1` = `test`.`t3`.`c1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t1`.`a1`) = `test`.`t1`.`a1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t1`.`a2`)) union select `test`.`t2`.`b1` AS `b1`,`test`.`t2`.`b2` AS `b2` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`b1`) and (<cache>(`test`.`t1`.`a2`) = `test`.`t2`.`b2`)))) and (`test`.`t3`.`c2` > '0'))
select * from t1, t3
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(c1, c2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
a1 = c1;
a1 a2 c1 c2
1 - 01 2 - 01 1 - 01 2 - 01
1 - 02 2 - 02 1 - 02 2 - 02
/******************************************************************************
* Negative tests, where materialization should not be applied.
******************************************************************************/
# UNION in a subquery
explain extended
select * from t3
where c1 in (select a1 from t1 where a1 > '0' UNION select b1 from t2 where b1 < '9');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
3 DEPENDENT UNION t2 ALL NULL NULL NULL NULL 5 100.00 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>(`test`.`t3`.`c1`,<exists>(select 1 AS `Not_used` from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t3`.`c1`) = `test`.`t1`.`a1`)) union select 1 AS `Not_used` from `test`.`t2` where ((`test`.`t2`.`b1` < '9') and (<cache>(`test`.`t3`.`c1`) = `test`.`t2`.`b1`))))
select * from t3
where c1 in (select a1 from t1 where a1 > '0' UNION select b1 from t2 where b1 < '9');
c1 c2
1 - 01 2 - 01
1 - 02 2 - 02
1 - 03 2 - 03
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 t3a where c1 = a1) or
b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3 t3c
where (c1, c2) in (select b1, b2 from t2i where b2 > '0' or b2 = a2));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Start temporary
1 PRIMARY t2i ref it2i1,it2i2,it2i3 it2i3 18 test.t1.a1,test.t1.a2 2 100.00 Using index
1 PRIMARY t3c ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer
4 SUBQUERY t3b ALL NULL NULL NULL NULL 4 100.00 Using where
3 DEPENDENT SUBQUERY t3a ALL NULL NULL NULL NULL 4 100.00 Using where
Warnings:
Note 1276 Field or reference 'test.t1.a1' of SELECT #3 was resolved in SELECT #1
Note 1276 Field or reference 'test.t1.a2' of SELECT #6 was resolved in SELECT #1
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) semi join (`test`.`t2i` join `test`.`t3` `t3c`) where ((`test`.`t2i`.`b2` = `test`.`t1`.`a2`) and (`test`.`t3c`.`c2` = `test`.`t1`.`a2`) and (`test`.`t2`.`b2` = `test`.`t1`.`a2`) and (`test`.`t2i`.`b1` = `test`.`t1`.`a1`) and (`test`.`t3c`.`c1` = `test`.`t1`.`a1`) and (`test`.`t2`.`b1` = `test`.`t1`.`a1`) and (<in_optimizer>(`test`.`t2`.`b2`,<exists>(select 1 AS `Not_used` from `test`.`t3` `t3a` where ((`test`.`t3a`.`c1` = `test`.`t1`.`a1`) and (<cache>(`test`.`t2`.`b2`) = `test`.`t3a`.`c2`)))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (select `test`.`t3b`.`c2` AS `c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on distinct_key where ((`test`.`t2`.`b2` = `SUBQUERY#4`.`c2`)))))))
explain extended
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select '1 - 01' AS `1 - 01`,'2 - 01' AS `2 - 01` having ((<cache>(`test`.`t1`.`a1`) = '1 - 01') and (<cache>(`test`.`t1`.`a2`) = '2 - 01'))))
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01');
a1 a2
1 - 01 2 - 01
explain extended
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01' from dual);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` where <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(select '1 - 01' AS `1 - 01`,'2 - 01' AS `2 - 01` having ((<cache>(`test`.`t1`.`a1`) = '1 - 01') and (<cache>(`test`.`t1`.`a2`) = '2 - 01'))))
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01' from dual);
a1 a2
1 - 01 2 - 01
/******************************************************************************
* Subqueries in other uncovered clauses.
******************************************************************************/
/* SELECT clause */
select ((a1,a2) IN (select * from t2 where b2 > '0')) IS NULL from t1;
((a1,a2) IN (select * from t2 where b2 > '0')) IS NULL
0
0
0
/* GROUP BY clause */
create table columns (col int key);
insert into columns values (1), (2);
explain extended
select * from t1 group by (select col from columns limit 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY columns index NULL PRIMARY 4 NULL 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` group by (select `test`.`columns`.`col` AS `col` from `test`.`columns` limit 1)
select * from t1 group by (select col from columns limit 1);
a1 a2
1 - 00 2 - 00
explain extended
select * from t1 group by (a1 in (select col from columns));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using temporary; Using filesort
2 DEPENDENT SUBQUERY columns unique_subquery PRIMARY PRIMARY 4 func 1 100.00 Using index; Using where; Full scan on NULL key
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` group by <in_optimizer>(`test`.`t1`.`a1`,<exists>(<primary_index_lookup>(<cache>(`test`.`t1`.`a1`) in columns on PRIMARY where trigcond((<cache>(`test`.`t1`.`a1`) = `test`.`columns`.`col`)))))
select * from t1 group by (a1 in (select col from columns));
a1 a2
1 - 00 2 - 00
/* ORDER BY clause */
explain extended
select * from t1 order by (select col from columns limit 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00
2 SUBQUERY columns index NULL PRIMARY 4 NULL 2 100.00 Using index
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` order by (select `test`.`columns`.`col` AS `col` from `test`.`columns` limit 1)
select * from t1 order by (select col from columns limit 1);
a1 a2
1 - 00 2 - 00
1 - 01 2 - 01
1 - 02 2 - 02
/******************************************************************************
* Column types/sizes that affect materialization.
******************************************************************************/
/*
Test that BLOBs are not materialized (except when arguments of some functions).
*/
# force materialization to be always considered
set @prefix_len = 6;
set @blob_len = 16;
set @suffix_len = @blob_len - @prefix_len;
create table t1_16 (a1 blob(16), a2 blob(16));
create table t2_16 (b1 blob(16), b2 blob(16));
create table t3_16 (c1 blob(16), c2 blob(16));
insert into t1_16 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_16 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_16 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_16 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_16 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_16 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select b1 from t2_16 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
1 PRIMARY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using where; End temporary; Using join buffer
Warnings:
Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` semi join (`test`.`t2_16`) where ((`test`.`t2_16`.`b1` = `test`.`t1_16`.`a1`) and (`test`.`t1_16`.`a1` > '0'))
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select b1 from t2_16 where b1 > '0');
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended select left(a1,7), left(a2,7)
from t1_16
where (a1,a2) in (select b1, b2 from t2_16 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
1 PRIMARY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using where; End temporary; Using join buffer
Warnings:
Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` semi join (`test`.`t2_16`) where ((`test`.`t2_16`.`b2` = `test`.`t1_16`.`a2`) and (`test`.`t2_16`.`b1` = `test`.`t1_16`.`a1`) and (`test`.`t1_16`.`a1` > '0'))
select left(a1,7), left(a2,7)
from t1_16
where (a1,a2) in (select b1, b2 from t2_16 where b1 > '0');
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 20 func 1 1.00
2 SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` semi join (`test`.`t2_16`) where ((`test`.`t2_16`.`b1` > '0') and (`test`.`t1_16`.`a1` = substr(`test`.`t2_16`.`b1`,1,16)))
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where
2 DEPENDENT SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from `test`.`t1_16` where <in_optimizer>(`test`.`t1_16`.`a1`,<exists>(select group_concat(`test`.`t2_16`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_16` group by `test`.`t2_16`.`b2` having (<cache>(`test`.`t1_16`.`a1`) = <ref_null_helper>(group_concat(`test`.`t2_16`.`b1` separator ',')))))
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
set @@group_concat_max_len = 256;
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_16.a1 1 100.00 Using where
2 SUBQUERY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_16`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_16`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_16`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_16` group by `test`.`t2_16`.`b2`) join `test`.`t1_16` where (`test`.`t1_16`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended
select * from t1
where concat(a1,'x') IN
(select left(a1,8) from t1_16
where (a1, a2) IN
(select t2_16.b1, t2_16.b2 from t2_16, t2
where t2.b2 = substring(t2_16.b2,1,6) and
t2.b1 IN (select c1 from t3 where c2 > '0')));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Start temporary
1 PRIMARY t1_16 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
1 PRIMARY t2_16 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
1 PRIMARY t3 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer
Warnings:
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t3` join `test`.`t2_16` join `test`.`t2` join `test`.`t1_16`) where ((`test`.`t2_16`.`b2` = `test`.`t1_16`.`a2`) and (`test`.`t2_16`.`b1` = `test`.`t1_16`.`a1`) and (`test`.`t2`.`b1` = `test`.`t3`.`c1`) and (`test`.`t2`.`b2` = substr(`test`.`t2_16`.`b2`,1,6)) and (`test`.`t3`.`c2` > '0') and (concat(`test`.`t1`.`a1`,'x') = left(`test`.`t1_16`.`a1`,8)))
drop table t1_16, t2_16, t3_16;
set @blob_len = 512;
set @suffix_len = @blob_len - @prefix_len;
create table t1_512 (a1 blob(512), a2 blob(512));
create table t2_512 (b1 blob(512), b2 blob(512));
create table t3_512 (c1 blob(512), c2 blob(512));
insert into t1_512 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_512 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_512 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_512 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_512 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_512 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select b1 from t2_512 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
1 PRIMARY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using where; End temporary; Using join buffer
Warnings:
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` semi join (`test`.`t2_512`) where ((`test`.`t2_512`.`b1` = `test`.`t1_512`.`a1`) and (`test`.`t1_512`.`a1` > '0'))
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select b1 from t2_512 where b1 > '0');
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended select left(a1,7), left(a2,7)
from t1_512
where (a1,a2) in (select b1, b2 from t2_512 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
1 PRIMARY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using where; End temporary; Using join buffer
Warnings:
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` semi join (`test`.`t2_512`) where ((`test`.`t2_512`.`b2` = `test`.`t1_512`.`a2`) and (`test`.`t2_512`.`b1` = `test`.`t1_512`.`a1`) and (`test`.`t1_512`.`a1` > '0'))
select left(a1,7), left(a2,7)
from t1_512
where (a1,a2) in (select b1, b2 from t2_512 where b1 > '0');
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 517 func 1 1.00
2 SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from `test`.`t1_512` semi join (`test`.`t2_512`) where ((`test`.`t2_512`.`b1` > '0') and (`test`.`t1_512`.`a1` = substr(`test`.`t2_512`.`b1`,1,512)))
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_512.a1 1 100.00 Using where
2 SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_512`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_512` group by `test`.`t2_512`.`b2`) join `test`.`t1_512` where (`test`.`t1_512`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
left(a1,7) left(a2,7)
set @@group_concat_max_len = 256;
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_512 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_512.a1 1 100.00 Using where
2 SUBQUERY t2_512 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_512`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_512`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_512`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_512` group by `test`.`t2_512`.`b2`) join `test`.`t1_512` where (`test`.`t1_512`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
left(a1,7) left(a2,7)
drop table t1_512, t2_512, t3_512;
set @blob_len = 1024;
set @suffix_len = @blob_len - @prefix_len;
create table t1_1024 (a1 blob(1024), a2 blob(1024));
create table t2_1024 (b1 blob(1024), b2 blob(1024));
create table t3_1024 (c1 blob(1024), c2 blob(1024));
insert into t1_1024 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_1024 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_1024 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1024 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_1024 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1024 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select b1 from t2_1024 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
1 PRIMARY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using where; End temporary; Using join buffer
Warnings:
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` semi join (`test`.`t2_1024`) where ((`test`.`t2_1024`.`b1` = `test`.`t1_1024`.`a1`) and (`test`.`t1_1024`.`a1` > '0'))
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select b1 from t2_1024 where b1 > '0');
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended select left(a1,7), left(a2,7)
from t1_1024
where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
1 PRIMARY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using where; End temporary; Using join buffer
Warnings:
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` semi join (`test`.`t2_1024`) where ((`test`.`t2_1024`.`b2` = `test`.`t1_1024`.`a2`) and (`test`.`t2_1024`.`b1` = `test`.`t1_1024`.`a1`) and (`test`.`t1_1024`.`a1` > '0'))
select left(a1,7), left(a2,7)
from t1_1024
where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0');
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 15 func 1 1.00
2 SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1024` semi join (`test`.`t2_1024`) where ((`test`.`t2_1024`.`b1` > '0') and (`test`.`t1_1024`.`a1` = substr(`test`.`t2_1024`.`b1`,1,1024)))
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0');
left(a1,7) left(a2,7)
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_1024.a1 1 100.00 Using where
2 SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_1024`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1024` group by `test`.`t2_1024`.`b2`) join `test`.`t1_1024` where (`test`.`t1_1024`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
left(a1,7) left(a2,7)
set @@group_concat_max_len = 256;
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1024 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_1024.a1 1 100.00 Using where
2 SUBQUERY t2_1024 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_1024`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1024`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_1024`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1024` group by `test`.`t2_1024`.`b2`) join `test`.`t1_1024` where (`test`.`t1_1024`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
left(a1,7) left(a2,7)
drop table t1_1024, t2_1024, t3_1024;
set @blob_len = 1025;
set @suffix_len = @blob_len - @prefix_len;
create table t1_1025 (a1 blob(1025), a2 blob(1025));
create table t2_1025 (b1 blob(1025), b2 blob(1025));
create table t3_1025 (c1 blob(1025), c2 blob(1025));
insert into t1_1025 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_1025 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_1025 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1025 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_1025 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1025 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select b1 from t2_1025 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
1 PRIMARY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using where; End temporary; Using join buffer
Warnings:
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` semi join (`test`.`t2_1025`) where ((`test`.`t2_1025`.`b1` = `test`.`t1_1025`.`a1`) and (`test`.`t1_1025`.`a1` > '0'))
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select b1 from t2_1025 where b1 > '0');
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended select left(a1,7), left(a2,7)
from t1_1025
where (a1,a2) in (select b1, b2 from t2_1025 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
1 PRIMARY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using where; End temporary; Using join buffer
Warnings:
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` semi join (`test`.`t2_1025`) where ((`test`.`t2_1025`.`b2` = `test`.`t1_1025`.`a2`) and (`test`.`t2_1025`.`b1` = `test`.`t1_1025`.`a1`) and (`test`.`t1_1025`.`a1` > '0'))
select left(a1,7), left(a2,7)
from t1_1025
where (a1,a2) in (select b1, b2 from t2_1025 where b1 > '0');
left(a1,7) left(a2,7)
1 - 01x 2 - 01x
1 - 02x 2 - 02x
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 15 func 1 1.00
2 SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using where
Warnings:
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from `test`.`t1_1025` semi join (`test`.`t2_1025`) where ((`test`.`t2_1025`.`b1` > '0') and (`test`.`t1_1025`.`a1` = substr(`test`.`t2_1025`.`b1`,1,1025)))
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0');
left(a1,7) left(a2,7)
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_1025.a1 1 100.00 Using where
2 SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_1025`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1025` group by `test`.`t2_1025`.`b2`) join `test`.`t1_1025` where (`test`.`t1_1025`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
left(a1,7) left(a2,7)
set @@group_concat_max_len = 256;
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1_1025 ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref distinct_key distinct_key 261 test.t1_1025.a1 1 100.00 Using where
2 SUBQUERY t2_1025 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select left(`test`.`t1_1025`.`a1`,7) AS `left(a1,7)`,left(`test`.`t1_1025`.`a2`,7) AS `left(a2,7)` from <materialize> (select group_concat(`test`.`t2_1025`.`b1` separator ',') AS `group_concat(b1)` from `test`.`t2_1025` group by `test`.`t2_1025`.`b2`) join `test`.`t1_1025` where (`test`.`t1_1025`.`a1` = `SUBQUERY#2`.`group_concat(b1)`)
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
left(a1,7) left(a2,7)
drop table t1_1025, t2_1025, t3_1025;
create table t1bit (a1 bit(3), a2 bit(3));
create table t2bit (b1 bit(3), b2 bit(3));
insert into t1bit values (b'000', b'100');
insert into t1bit values (b'001', b'101');
insert into t1bit values (b'010', b'110');
insert into t2bit values (b'001', b'101');
insert into t2bit values (b'010', b'110');
insert into t2bit values (b'110', b'111');
explain extended select bin(a1), bin(a2)
from t1bit
where (a1, a2) in (select b1, b2 from t2bit);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1bit ALL NULL NULL NULL NULL 3 100.00
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 10 func 1 1.00
2 SUBQUERY t2bit ALL NULL NULL NULL NULL 3 100.00
Warnings:
Note 1003 select conv(`test`.`t1bit`.`a1`,10,2) AS `bin(a1)`,conv(`test`.`t1bit`.`a2`,10,2) AS `bin(a2)` from `test`.`t1bit` semi join (`test`.`t2bit`) where 1
select bin(a1), bin(a2)
from t1bit
where (a1, a2) in (select b1, b2 from t2bit);
bin(a1) bin(a2)
1 101
10 110
drop table t1bit, t2bit;
create table t1bb (a1 bit(3), a2 blob(3));
create table t2bb (b1 bit(3), b2 blob(3));
insert into t1bb values (b'000', '100');
insert into t1bb values (b'001', '101');
insert into t1bb values (b'010', '110');
insert into t2bb values (b'001', '101');
insert into t2bb values (b'010', '110');
insert into t2bb values (b'110', '111');
explain extended select bin(a1), a2
from t1bb
where (a1, a2) in (select b1, b2 from t2bb);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1bb ALL NULL NULL NULL NULL 3 100.00 Start temporary
1 PRIMARY t2bb ALL NULL NULL NULL NULL 3 100.00 Using where; End temporary; Using join buffer
Warnings:
Note 1003 select conv(`test`.`t1bb`.`a1`,10,2) AS `bin(a1)`,`test`.`t1bb`.`a2` AS `a2` from `test`.`t1bb` semi join (`test`.`t2bb`) where ((`test`.`t2bb`.`b2` = `test`.`t1bb`.`a2`) and (`test`.`t2bb`.`b1` = `test`.`t1bb`.`a1`))
select bin(a1), a2
from t1bb
where (a1, a2) in (select b1, b2 from t2bb);
bin(a1) a2
1 101
10 110
drop table t1bb, t2bb;
drop table t1, t2, t3, t1i, t2i, t3i, columns;
/******************************************************************************
* Test the cache of the left operand of IN.
******************************************************************************/
# Test that default values of Cached_item are not used for comparison
create table t1 (s1 int);
create table t2 (s2 int);
insert into t1 values (5),(1),(0);
insert into t2 values (0), (1);
select s2 from t2 where s2 in (select s1 from t1);
s2
0
1
drop table t1, t2;
create table t1 (a int not null, b int not null);
create table t2 (c int not null, d int not null);
create table t3 (e int not null);
insert into t1 values (1,10);
insert into t1 values (1,20);
insert into t1 values (2,10);
insert into t1 values (2,20);
insert into t1 values (2,30);
insert into t1 values (3,20);
insert into t1 values (4,40);
insert into t2 values (2,10);
insert into t2 values (2,20);
insert into t2 values (2,40);
insert into t2 values (3,20);
insert into t2 values (4,10);
insert into t2 values (5,10);
insert into t3 values (10);
insert into t3 values (10);
insert into t3 values (20);
insert into t3 values (30);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL unique_key NULL NULL NULL 6 1.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 7 100.00 Using where; Using join buffer
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t1`.`a` = `test`.`t2`.`c`) and (`test`.`t2`.`d` >= 20))
select a from t1 where a in (select c from t2 where d >= 20);
a
2
2
2
3
create index it1a on t1(a);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY SUBQUERY#2 ALL unique_key NULL NULL NULL 6 1.00
1 PRIMARY t1 ref it1a it1a 4 test.t2.c 2 100.00 Using index
2 SUBQUERY t2 ALL NULL NULL NULL NULL 6 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t1`.`a` = `test`.`t2`.`c`) and (`test`.`t2`.`d` >= 20))
select a from t1 where a in (select c from t2 where d >= 20);
a
2
2
2
3
insert into t2 values (1,10);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index it1a it1a 4 NULL 7 100.00 Using index
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 4 func 1 1.00
2 SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`d` >= 20))
select a from t1 where a in (select c from t2 where d >= 20);
a
2
2
2
3
explain extended
select a from t1 group by a having a in (select c from t2 where d >= 20);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL it1a 4 NULL 7 100.00 Using index
2 SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `SUBQUERY#2`.`c`)))))
select a from t1 group by a having a in (select c from t2 where d >= 20);
a
2
3
create index iab on t1(a, b);
explain extended
select a from t1 group by a having a in (select c from t2 where d >= 20);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL it1a 4 NULL 7 100.00 Using index
2 SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key where ((`test`.`t1`.`a` = `SUBQUERY#2`.`c`)))))
select a from t1 group by a having a in (select c from t2 where d >= 20);
a
2
3
explain extended
select a from t1 group by a
having a in (select c from t2 where d >= some(select e from t3 where max(b)=e));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 index NULL iab 8 NULL 7 100.00 Using index
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 7 100.00 Using where
3 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
Warnings:
Note 1276 Field or reference 'test.t1.b' of SELECT #3 was resolved in SELECT #1
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having <in_optimizer>(`test`.`t1`.`a`,<exists>(select 1 AS `Not_used` from `test`.`t2` where (<nop>(<in_optimizer>(`test`.`t2`.`d`,<exists>(select `test`.`t3`.`e` AS `e` from `test`.`t3` where (max(`test`.`t1`.`b`) = `test`.`t3`.`e`) having (<cache>(`test`.`t2`.`d`) >= <ref_null_helper>(`test`.`t3`.`e`))))) and (<cache>(`test`.`t1`.`a`) = `test`.`t2`.`c`))))
select a from t1 group by a
having a in (select c from t2 where d >= some(select e from t3 where max(b)=e));
a
2
3
explain extended
select a from t1
where a in (select c from t2 where d >= some(select e from t3 where b=e));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 7 100.00 Start temporary
1 PRIMARY t1 ref it1a,iab iab 4 test.t2.c 1 100.00 Using where; Using index; End temporary
3 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
Warnings:
Note 1276 Field or reference 'test.t1.b' of SELECT #3 was resolved in SELECT #1
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t1`.`a` = `test`.`t2`.`c`) and <nop>(<in_optimizer>(`test`.`t2`.`d`,<exists>(select 1 AS `Not_used` from `test`.`t3` where ((`test`.`t1`.`b` = `test`.`t3`.`e`) and (<cache>(`test`.`t2`.`d`) >= `test`.`t3`.`e`))))))
select a from t1
where a in (select c from t2 where d >= some(select e from t3 where b=e));
a
2
2
2
3
1
drop table t1, t2, t3;
create table t2 (a int, b int, key(a), key(b));
insert into t2 values (3,3),(3,3),(3,3);
select 1 from t2 where
t2.a > 1
or
t2.a = 3 and not t2.a not in (select t2.b from t2);
1
1
1
1
drop table t2;
create table t1 (a1 int key);
create table t2 (b1 int);
insert into t1 values (5);
explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 1
1 PRIMARY SUBQUERY#2 const distinct_key distinct_key 5 const 1
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
min(a1)
NULL
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='default,materialization=off';
explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
min(a1)
set @@optimizer_switch='default,semijoin=off';
explain select min(a1) from t1 where 7 in (select b1 from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
select min(a1) from t1 where 7 in (select b1 from t2);
min(a1)
set @@optimizer_switch='default,materialization=off';
# with MariaDB and MWL#90, this particular case is solved:
explain select min(a1) from t1 where 7 in (select b1 from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
select min(a1) from t1 where 7 in (select b1 from t2);
min(a1)
NULL
# but when we go around MWL#90 code, the problem still shows up:
explain select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
min(a1)
set @@optimizer_switch= @save_optimizer_switch;
drop table t1,t2;
create table t1 (a char(2), b varchar(10));
insert into t1 values ('a', 'aaa');
insert into t1 values ('aa', 'aaaa');
explain select a,b from t1 where b in (select a from t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 3 func 1
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2
select a,b from t1 where b in (select a from t1);
a b
prepare st1 from "select a,b from t1 where b in (select a from t1)";
execute st1;
a b
execute st1;
a b
drop table t1;
CREATE TABLE t1 (f1 INT, f2 DECIMAL(5,3)) ENGINE=MyISAM;
INSERT INTO t1 (f1, f2) VALUES (1, 1.789);
INSERT INTO t1 (f1, f2) VALUES (13, 1.454);
INSERT INTO t1 (f1, f2) VALUES (10, 1.668);
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1, 1.789);
INSERT INTO t2 VALUES (13, 1.454);
set @save_optimizer_switch=@@optimizer_switch;
SET @@optimizer_switch='default,semijoin=on,materialization=on';
EXPLAIN SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY SUBQUERY#2 ALL unique_key NULL NULL NULL 2
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where; Using join buffer
2 SUBQUERY t2 ALL NULL NULL NULL NULL 2
SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
COUNT(*)
2
set @@optimizer_switch= @save_optimizer_switch;
DROP TABLE t1, t2;
CREATE TABLE t1 (
pk int,
a varchar(1),
b varchar(4),
c varchar(4),
d varchar(4),
PRIMARY KEY (pk)
);
INSERT INTO t1 VALUES (1,'o','ffff','ffff','ffoo'),(2,'f','ffff','ffff','ffff');
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1,'i','iiii','iiii','iiii'),(2,'f','ffff','ffff','ffff');
set @save_optimizer_switch=@@optimizer_switch;
SET @@optimizer_switch='default,semijoin=on,materialization=on';
EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
1 PRIMARY SUBQUERY#2 eq_ref unique_key unique_key 5 func 1
2 SUBQUERY t2 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Using MRR
SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
pk
2
SELECT pk FROM t1 WHERE (b,c,d) IN (SELECT b,c,d FROM t2 WHERE pk > 0);
pk
2
DROP TABLE t1, t2;
set optimizer_switch=@save_optimizer_switch;
#
# BUG#50019: Wrong result for IN-subquery with materialization
#
create table t1(i int);
insert into t1 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
create table t2(i int);
insert into t2 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
create table t3(i int);
insert into t3 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
select * from t1 where t1.i in (select t2.i from t2 join t3 where t2.i + t3.i = 5);
i
1
2
3
4
set @save_optimizer_switch=@@optimizer_switch;
set session optimizer_switch='materialization=off';
select * from t1 where t1.i in (select t2.i from t2 join t3 where t2.i + t3.i = 5);
i
4
3
2
1
set session optimizer_switch=@save_optimizer_switch;
drop table t1, t2, t3;
create table t0 (a int);
insert into t0 values (0),(1),(2);
create table t1 (a int);
insert into t1 values (0),(1),(2);
explain select a, a in (select a from t1) from t0;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t0 ALL NULL NULL NULL NULL 3
2 SUBQUERY t1 ALL NULL NULL NULL NULL 3
select a, a in (select a from t1) from t0;
a a in (select a from t1)
0 1
1 1
2 1
prepare s from 'select a, a in (select a from t1) from t0';
execute s;
a a in (select a from t1)
0 1
1 1
2 1
update t1 set a=123;
execute s;
a a in (select a from t1)
0 0
1 0
2 0
drop table t0, t1;
set optimizer_switch='firstmatch=on';
mysql-test/t/subselect_mat.test
View file @ 62bf7f61
......@@ -3,930 +3,10 @@
# (WL#1110: Subquery optimization: materialization)
#
--disable_warnings
drop table if exists t1, t2, t3, t1i, t2i, t3i;
drop view if exists v1, v2, v1m, v2m;
--enable_warnings
create table t1 (a1 char(8), a2 char(8));
create table t2 (b1 char(8), b2 char(8));
create table t3 (c1 char(8), c2 char(8));
insert into t1 values ('1 - 00', '2 - 00');
insert into t1 values ('1 - 01', '2 - 01');
insert into t1 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 01', '2 - 01');
insert into t2 values ('1 - 01', '2 - 01');
insert into t2 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 03', '2 - 03');
insert into t3 values ('1 - 01', '2 - 01');
insert into t3 values ('1 - 02', '2 - 02');
insert into t3 values ('1 - 03', '2 - 03');
insert into t3 values ('1 - 04', '2 - 04');
# Indexed columns
create table t1i (a1 char(8), a2 char(8));
create table t2i (b1 char(8), b2 char(8));
create table t3i (c1 char(8), c2 char(8));
create index it1i1 on t1i (a1);
create index it1i2 on t1i (a2);
create index it1i3 on t1i (a1, a2);
create index it2i1 on t2i (b1);
create index it2i2 on t2i (b2);
create index it2i3 on t2i (b1, b2);
create index it3i1 on t3i (c1);
create index it3i2 on t3i (c2);
create index it3i3 on t3i (c1, c2);
insert into t1i select * from t1;
insert into t2i select * from t2;
insert into t3i select * from t3;
# force the use of materialization
set @@optimizer_switch='semijoin=off';
/******************************************************************************
* Simple tests.
******************************************************************************/
# non-indexed nullable fields
explain extended
select * from t1 where a1 in (select b1 from t2 where b1 > '0');
select * from t1 where a1 in (select b1 from t2 where b1 > '0');
explain extended
select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
explain extended
select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
explain extended
select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
# indexed columns
explain extended
select * from t1i where a1 in (select b1 from t2i where b1 > '0');
select * from t1i where a1 in (select b1 from t2i where b1 > '0');
--replace_column 6 # 8 # 11 #
explain extended
select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
--replace_column 6 # 7 # 8 # 11 #
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
--replace_column 6 # 7 # 8 # 11 #
explain extended
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
# BUG#31639: Wrong plan for uncorrelated subquery when loose scan is applicable.
explain extended
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1);
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1);
prepare st1 from "explain select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)";
execute st1;
execute st1;
prepare st2 from "select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)";
execute st2;
execute st2;
explain extended
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
-- error 1235
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i limit 1,1);
# test re-optimization/re-execution with different execution methods
# prepare once, exec with different modes
set @@optimizer_switch='default,semijoin=off';
prepare st1 from
"select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1)";
set @@optimizer_switch='default,materialization=off';
execute st1;
set @@optimizer_switch='default,semijoin=off';
execute st1;
set @@optimizer_switch='default,materialization=off';
prepare st1 from
"select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1)";
set @@optimizer_switch='default,semijoin=off';
execute st1;
set @@optimizer_switch='default,materialization=off';
execute st1;
set @@optimizer_switch='default,semijoin=off';
# materialize the result of ORDER BY
# non-indexed fields
explain extended
select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
# indexed fields
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
/******************************************************************************
* Views, UNIONs, several levels of nesting.
******************************************************************************/
# materialize the result of subquery over temp-table view
create algorithm=merge view v1 as
select b1, c2 from t2, t3 where b2 > c2;
create algorithm=merge view v2 as
select b1, c2 from t2, t3 group by b2, c2;
create algorithm=temptable view v1m as
select b1, c2 from t2, t3 where b2 > c2;
create algorithm=temptable view v2m as
select b1, c2 from t2, t3 group by b2, c2;
select * from v1 where (c2, b1) in (select c2, b1 from v2 where b1 is not null);
select * from v1 where (c2, b1) in (select distinct c2, b1 from v2 where b1 is not null);
select * from v1m where (c2, b1) in (select c2, b1 from v2m where b1 is not null);
select * from v1m where (c2, b1) in (select distinct c2, b1 from v2m where b1 is not null);
drop view v1, v2, v1m, v2m;
# nested subqueries, views
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2 where b1 > '0') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select b1, b2 from t2 where b1 > '0') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
--replace_column 6 # 7 # 8 # 11 #
explain extended
select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
# as above with correlated innermost subquery
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 t3a where c1 = a1) or
b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3 t3c
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 t3a where c1 = a1) or
b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3 t3c
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
# multiple levels of nesting subqueries, unions
--replace_column 6 # 7 # 8 # 11 #
explain extended
(select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')
group by b1, b2) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')))
UNION
(select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')));
(select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')
group by b1, b2) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')))
UNION
(select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')));
# UNION of subqueries as a subquery (thus it is not computed via materialization)
explain extended
select * from t1
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
# as above, with a join conditon between the outer references
explain extended
select * from t1, t3
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(c1, c2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
a1 = c1;
select * from t1, t3
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(c1, c2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
a1 = c1;
/******************************************************************************
* Negative tests, where materialization should not be applied.
******************************************************************************/
# UNION in a subquery
explain extended
select * from t3
where c1 in (select a1 from t1 where a1 > '0' UNION select b1 from t2 where b1 < '9');
select * from t3
where c1 in (select a1 from t1 where a1 > '0' UNION select b1 from t2 where b1 < '9');
# correlation
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 t3a where c1 = a1) or
b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3 t3c
where (c1, c2) in (select b1, b2 from t2i where b2 > '0' or b2 = a2));
# subquery has no tables
explain extended
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01');
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01');
explain extended
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01' from dual);
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01' from dual);
/******************************************************************************
* Subqueries in other uncovered clauses.
******************************************************************************/
/* SELECT clause */
select ((a1,a2) IN (select * from t2 where b2 > '0')) IS NULL from t1;
/* GROUP BY clause */
create table columns (col int key);
insert into columns values (1), (2);
explain extended
select * from t1 group by (select col from columns limit 1);
select * from t1 group by (select col from columns limit 1);
explain extended
select * from t1 group by (a1 in (select col from columns));
select * from t1 group by (a1 in (select col from columns));
/* ORDER BY clause */
explain extended
select * from t1 order by (select col from columns limit 1);
select * from t1 order by (select col from columns limit 1);
/******************************************************************************
* Column types/sizes that affect materialization.
******************************************************************************/
/*
Test that BLOBs are not materialized (except when arguments of some functions).
*/
# force materialization to be always considered
set @@optimizer_switch='semijoin=off';
set @prefix_len = 6;
# BLOB == 16 (small blobs that could be stored in HEAP tables)
set @blob_len = 16;
set @suffix_len = @blob_len - @prefix_len;
create table t1_16 (a1 blob(16), a2 blob(16));
create table t2_16 (b1 blob(16), b2 blob(16));
create table t3_16 (c1 blob(16), c2 blob(16));
insert into t1_16 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_16 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_16 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_16 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_16 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_16 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select b1 from t2_16 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select b1 from t2_16 where b1 > '0');
# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_16
where (a1,a2) in (select b1, b2 from t2_16 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_16
where (a1,a2) in (select b1, b2 from t2_16 where b1 > '0');
# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');
# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 512)
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
# BLOB column at the second (intermediate) level of nesting
explain extended
select * from t1
where concat(a1,'x') IN
(select left(a1,8) from t1_16
where (a1, a2) IN
(select t2_16.b1, t2_16.b2 from t2_16, t2
where t2.b2 = substring(t2_16.b2,1,6) and
t2.b1 IN (select c1 from t3 where c2 > '0')));
drop table t1_16, t2_16, t3_16;
# BLOB == 512 (CONVERT_IF_BIGGER_TO_BLOB == 512)
set @blob_len = 512;
set @suffix_len = @blob_len - @prefix_len;
create table t1_512 (a1 blob(512), a2 blob(512));
create table t2_512 (b1 blob(512), b2 blob(512));
create table t3_512 (c1 blob(512), c2 blob(512));
insert into t1_512 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_512 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_512 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_512 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_512 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_512 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select b1 from t2_512 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select b1 from t2_512 where b1 > '0');
# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_512
where (a1,a2) in (select b1, b2 from t2_512 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_512
where (a1,a2) in (select b1, b2 from t2_512 where b1 > '0');
# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');
# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 512)
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
drop table t1_512, t2_512, t3_512;
# BLOB == 1024 (group_concat_max_len == 1024)
set @blob_len = 1024;
set @suffix_len = @blob_len - @prefix_len;
create table t1_1024 (a1 blob(1024), a2 blob(1024));
create table t2_1024 (b1 blob(1024), b2 blob(1024));
create table t3_1024 (c1 blob(1024), c2 blob(1024));
insert into t1_1024 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_1024 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_1024 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1024 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_1024 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1024 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select b1 from t2_1024 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select b1 from t2_1024 where b1 > '0');
# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1024
where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1024
where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0');
# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0');
# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 1024)
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
drop table t1_1024, t2_1024, t3_1024;
# BLOB == 1025
set @blob_len = 1025;
set @suffix_len = @blob_len - @prefix_len;
create table t1_1025 (a1 blob(1025), a2 blob(1025));
create table t2_1025 (b1 blob(1025), b2 blob(1025));
create table t3_1025 (c1 blob(1025), c2 blob(1025));
insert into t1_1025 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_1025 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_1025 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1025 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_1025 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1025 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select b1 from t2_1025 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select b1 from t2_1025 where b1 > '0');
# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1025
where (a1,a2) in (select b1, b2 from t2_1025 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1025
where (a1,a2) in (select b1, b2 from t2_1025 where b1 > '0');
# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0');
# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 1025)
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
drop table t1_1025, t2_1025, t3_1025;
# test for BIT fields
create table t1bit (a1 bit(3), a2 bit(3));
create table t2bit (b1 bit(3), b2 bit(3));
insert into t1bit values (b'000', b'100');
insert into t1bit values (b'001', b'101');
insert into t1bit values (b'010', b'110');
insert into t2bit values (b'001', b'101');
insert into t2bit values (b'010', b'110');
insert into t2bit values (b'110', b'111');
set @@optimizer_switch='semijoin=off';
explain extended select bin(a1), bin(a2)
from t1bit
where (a1, a2) in (select b1, b2 from t2bit);
select bin(a1), bin(a2)
from t1bit
where (a1, a2) in (select b1, b2 from t2bit);
drop table t1bit, t2bit;
# test mixture of BIT and BLOB
create table t1bb (a1 bit(3), a2 blob(3));
create table t2bb (b1 bit(3), b2 blob(3));
insert into t1bb values (b'000', '100');
insert into t1bb values (b'001', '101');
insert into t1bb values (b'010', '110');
insert into t2bb values (b'001', '101');
insert into t2bb values (b'010', '110');
insert into t2bb values (b'110', '111');
explain extended select bin(a1), a2
from t1bb
where (a1, a2) in (select b1, b2 from t2bb);
select bin(a1), a2
from t1bb
where (a1, a2) in (select b1, b2 from t2bb);
drop table t1bb, t2bb;
drop table t1, t2, t3, t1i, t2i, t3i, columns;
/******************************************************************************
* Test the cache of the left operand of IN.
******************************************************************************/
set @@optimizer_switch='semijoin=off';
# Test that default values of Cached_item are not used for comparison
create table t1 (s1 int);
create table t2 (s2 int);
insert into t1 values (5),(1),(0);
insert into t2 values (0), (1);
select s2 from t2 where s2 in (select s1 from t1);
drop table t1, t2;
create table t1 (a int not null, b int not null);
create table t2 (c int not null, d int not null);
create table t3 (e int not null);
# the first outer row has no matching inner row
insert into t1 values (1,10);
insert into t1 values (1,20);
insert into t1 values (2,10);
insert into t1 values (2,20);
insert into t1 values (2,30);
insert into t1 values (3,20);
insert into t1 values (4,40);
insert into t2 values (2,10);
insert into t2 values (2,20);
insert into t2 values (2,40);
insert into t2 values (3,20);
insert into t2 values (4,10);
insert into t2 values (5,10);
insert into t3 values (10);
insert into t3 values (10);
insert into t3 values (20);
insert into t3 values (30);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
select a from t1 where a in (select c from t2 where d >= 20);
create index it1a on t1(a);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
select a from t1 where a in (select c from t2 where d >= 20);
# the first outer row has a matching inner row
insert into t2 values (1,10);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
select a from t1 where a in (select c from t2 where d >= 20);
# cacheing for IN predicates inside a having clause - here the cached
# items are changed to point to temporary tables.
explain extended
select a from t1 group by a having a in (select c from t2 where d >= 20);
select a from t1 group by a having a in (select c from t2 where d >= 20);
# create an index that can be used for the outer query GROUP BY
create index iab on t1(a, b);
explain extended
select a from t1 group by a having a in (select c from t2 where d >= 20);
select a from t1 group by a having a in (select c from t2 where d >= 20);
explain extended
select a from t1 group by a
having a in (select c from t2 where d >= some(select e from t3 where max(b)=e));
select a from t1 group by a
having a in (select c from t2 where d >= some(select e from t3 where max(b)=e));
explain extended
select a from t1
where a in (select c from t2 where d >= some(select e from t3 where b=e));
select a from t1
where a in (select c from t2 where d >= some(select e from t3 where b=e));
drop table t1, t2, t3;
#
# BUG#36133 "Assertion `exec_method != MATERIALIZATION || (exec_method == MATERIALIZATION &&"
#
create table t2 (a int, b int, key(a), key(b));
insert into t2 values (3,3),(3,3),(3,3);
select 1 from t2 where
t2.a > 1
or
t2.a = 3 and not t2.a not in (select t2.b from t2);
drop table t2;
#
# BUG#37896 Assertion on entry of Item_in_subselect::exec on subquery with AND NOT
#
create table t1 (a1 int key);
create table t2 (b1 int);
insert into t1 values (5);
# Query with group by, executed via materialization
explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
# Query with group by, executed via IN=>EXISTS
set @@optimizer_switch='default,materialization=off';
explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
# Executed with materialization
set @@optimizer_switch='default,semijoin=off';
explain select min(a1) from t1 where 7 in (select b1 from t2);
select min(a1) from t1 where 7 in (select b1 from t2);
# Executed with semi-join. Notice, this time we get a different result (NULL).
# This is the only correct result of all four queries. This difference is
# filed as BUG#40037.
set @@optimizer_switch='default,materialization=off';
-- echo # with MariaDB and MWL#90, this particular case is solved:
explain select min(a1) from t1 where 7 in (select b1 from t2);
select min(a1) from t1 where 7 in (select b1 from t2);
-- echo # but when we go around MWL#90 code, the problem still shows up:
explain select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
drop table t1,t2;
#
# BUG#36752 "subquery materialization produces wrong results when comparing different types"
#
create table t1 (a char(2), b varchar(10));
insert into t1 values ('a', 'aaa');
insert into t1 values ('aa', 'aaaa');
set @@optimizer_switch='default,semijoin=off';
explain select a,b from t1 where b in (select a from t1);
select a,b from t1 where b in (select a from t1);
prepare st1 from "select a,b from t1 where b in (select a from t1)";
execute st1;
execute st1;
drop table t1;
#
# Bug #44303 Assertion failures in Field_new_decimal::store_decimal
# when executing materialized InsideOut semijoin
#
CREATE TABLE t1 (f1 INT, f2 DECIMAL(5,3)) ENGINE=MyISAM;
INSERT INTO t1 (f1, f2) VALUES (1, 1.789);
INSERT INTO t1 (f1, f2) VALUES (13, 1.454);
INSERT INTO t1 (f1, f2) VALUES (10, 1.668);
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1, 1.789);
INSERT INTO t2 VALUES (13, 1.454);
SET @@optimizer_switch='default,semijoin=on,materialization=on';
EXPLAIN SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
DROP TABLE t1, t2;
#
# BUG#46548 IN-subqueries return 0 rows with materialization=on
#
CREATE TABLE t1 (
pk int,
a varchar(1),
b varchar(4),
c varchar(4),
d varchar(4),
PRIMARY KEY (pk)
);
INSERT INTO t1 VALUES (1,'o','ffff','ffff','ffoo'),(2,'f','ffff','ffff','ffff');
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1,'i','iiii','iiii','iiii'),(2,'f','ffff','ffff','ffff');
SET @@optimizer_switch='default,semijoin=on,materialization=on';
EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
SELECT pk FROM t1 WHERE (b,c,d) IN (SELECT b,c,d FROM t2 WHERE pk > 0);
DROP TABLE t1, t2;
--echo #
--echo # BUG#50019: Wrong result for IN-subquery with materialization
--echo #
create table t1(i int);
insert into t1 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
create table t2(i int);
insert into t2 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
create table t3(i int);
insert into t3 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
select * from t1 where t1.i in (select t2.i from t2 join t3 where t2.i + t3.i = 5);
set @save_optimizer_switch=@@optimizer_switch;
set session optimizer_switch='materialization=off';
select * from t1 where t1.i in (select t2.i from t2 join t3 where t2.i + t3.i = 5);
set session optimizer_switch=@save_optimizer_switch;
drop table t1, t2, t3;
#
# Test that the contentes of the temp table of a materialized subquery is
# cleanup up between PS reexecutions.
#
--source t/subselect_sj_mat.test
create table t0 (a int);
insert into t0 values (0),(1),(2);
create table t1 (a int);
insert into t1 values (0),(1),(2);
explain select a, a in (select a from t1) from t0;
select a, a in (select a from t1) from t0;
prepare s from 'select a, a in (select a from t1) from t0';
execute s;
update t1 set a=123;
execute s;
drop table t0, t1;
set @@optimizer_switch=default;
mysql-test/t/subselect_sj_mat.test 0 → 100644
View file @ 62bf7f61
#
# Hash semi-join regression tests
# (WL#1110: Subquery optimization: materialization)
#
set optimizer_switch='firstmatch=off';
--disable_warnings
drop table if exists t1, t2, t3, t1i, t2i, t3i;
drop view if exists v1, v2, v1m, v2m;
--enable_warnings
create table t1 (a1 char(8), a2 char(8));
create table t2 (b1 char(8), b2 char(8));
create table t3 (c1 char(8), c2 char(8));
insert into t1 values ('1 - 00', '2 - 00');
insert into t1 values ('1 - 01', '2 - 01');
insert into t1 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 01', '2 - 01');
insert into t2 values ('1 - 01', '2 - 01');
insert into t2 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 03', '2 - 03');
insert into t3 values ('1 - 01', '2 - 01');
insert into t3 values ('1 - 02', '2 - 02');
insert into t3 values ('1 - 03', '2 - 03');
insert into t3 values ('1 - 04', '2 - 04');
# Indexed columns
create table t1i (a1 char(8), a2 char(8));
create table t2i (b1 char(8), b2 char(8));
create table t3i (c1 char(8), c2 char(8));
create index it1i1 on t1i (a1);
create index it1i2 on t1i (a2);
create index it1i3 on t1i (a1, a2);
create index it2i1 on t2i (b1);
create index it2i2 on t2i (b2);
create index it2i3 on t2i (b1, b2);
create index it3i1 on t3i (c1);
create index it3i2 on t3i (c2);
create index it3i3 on t3i (c1, c2);
insert into t1i select * from t1;
insert into t2i select * from t2;
insert into t3i select * from t3;
/******************************************************************************
* Simple tests.
******************************************************************************/
# non-indexed nullable fields
explain extended
select * from t1 where a1 in (select b1 from t2 where b1 > '0');
select * from t1 where a1 in (select b1 from t2 where b1 > '0');
explain extended
select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
explain extended
select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
explain extended
select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
# indexed columns
explain extended
select * from t1i where a1 in (select b1 from t2i where b1 > '0');
select * from t1i where a1 in (select b1 from t2i where b1 > '0');
--replace_column 6 # 8 # 11 #
explain extended
select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
--replace_column 6 # 7 # 8 # 11 #
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
--replace_column 6 # 7 # 8 # 11 #
explain extended
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
# BUG#31639: Wrong plan for uncorrelated subquery when loose scan is applicable.
explain extended
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1);
select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1);
prepare st1 from "explain select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)";
execute st1;
execute st1;
prepare st2 from "select * from t1 where (a1, a2) in (select b1, max(b2) from t2i group by b1)";
execute st2;
execute st2;
explain extended
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
-- error 1235
select * from t1 where (a1, a2) in (select b1, min(b2) from t2i limit 1,1);
# test re-optimization/re-execution with different execution methods
# prepare once, exec with different modes
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='default,semijoin=off';
prepare st1 from
"select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1)";
set @@optimizer_switch='default,materialization=off';
execute st1;
set @@optimizer_switch='default,semijoin=off';
execute st1;
set @@optimizer_switch='default,materialization=off';
prepare st1 from
"select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1)";
set @@optimizer_switch='default,semijoin=off';
execute st1;
set @@optimizer_switch='default,materialization=off';
execute st1;
set @@optimizer_switch=@save_optimizer_switch;
# materialize the result of ORDER BY
# non-indexed fields
explain extended
select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
# indexed fields
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
/******************************************************************************
* Views, UNIONs, several levels of nesting.
******************************************************************************/
# materialize the result of subquery over temp-table view
create algorithm=merge view v1 as
select b1, c2 from t2, t3 where b2 > c2;
create algorithm=merge view v2 as
select b1, c2 from t2, t3 group by b2, c2;
create algorithm=temptable view v1m as
select b1, c2 from t2, t3 where b2 > c2;
create algorithm=temptable view v2m as
select b1, c2 from t2, t3 group by b2, c2;
select * from v1 where (c2, b1) in (select c2, b1 from v2 where b1 is not null);
select * from v1 where (c2, b1) in (select distinct c2, b1 from v2 where b1 is not null);
select * from v1m where (c2, b1) in (select c2, b1 from v2m where b1 is not null);
select * from v1m where (c2, b1) in (select distinct c2, b1 from v2m where b1 is not null);
drop view v1, v2, v1m, v2m;
# nested subqueries, views
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2 where b1 > '0') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select b1, b2 from t2 where b1 > '0') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
--replace_column 6 # 7 # 8 # 11 #
explain extended
select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
# as above with correlated innermost subquery
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 t3a where c1 = a1) or
b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3 t3c
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 t3a where c1 = a1) or
b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3 t3c
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
# multiple levels of nesting subqueries, unions
--replace_column 6 # 7 # 8 # 11 #
explain extended
(select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')
group by b1, b2) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')))
UNION
(select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')));
(select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 where c2 LIKE '%02') or
b2 in (select c2 from t3 where c2 LIKE '%03')
group by b1, b2) and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')))
UNION
(select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 > '0') and
(a1, a2) in (select c1, c2 from t3i
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')));
# UNION of subqueries as a subquery (thus it is not computed via materialization)
explain extended
select * from t1
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(a1, a2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
# as above, with a join conditon between the outer references
explain extended
select * from t1, t3
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(c1, c2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
a1 = c1;
select * from t1, t3
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
(c1, c2) in (select c1, c2 from t3
where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
a1 = c1;
/******************************************************************************
* Negative tests, where materialization should not be applied.
******************************************************************************/
# UNION in a subquery
explain extended
select * from t3
where c1 in (select a1 from t1 where a1 > '0' UNION select b1 from t2 where b1 < '9');
select * from t3
where c1 in (select a1 from t1 where a1 > '0' UNION select b1 from t2 where b1 < '9');
# correlation
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
where b2 in (select c2 from t3 t3a where c1 = a1) or
b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
(a1, a2) in (select c1, c2 from t3 t3c
where (c1, c2) in (select b1, b2 from t2i where b2 > '0' or b2 = a2));
# subquery has no tables
explain extended
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01');
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01');
explain extended
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01' from dual);
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01' from dual);
/******************************************************************************
* Subqueries in other uncovered clauses.
******************************************************************************/
/* SELECT clause */
select ((a1,a2) IN (select * from t2 where b2 > '0')) IS NULL from t1;
/* GROUP BY clause */
create table columns (col int key);
insert into columns values (1), (2);
explain extended
select * from t1 group by (select col from columns limit 1);
select * from t1 group by (select col from columns limit 1);
explain extended
select * from t1 group by (a1 in (select col from columns));
select * from t1 group by (a1 in (select col from columns));
/* ORDER BY clause */
explain extended
select * from t1 order by (select col from columns limit 1);
select * from t1 order by (select col from columns limit 1);
/******************************************************************************
* Column types/sizes that affect materialization.
******************************************************************************/
/*
Test that BLOBs are not materialized (except when arguments of some functions).
*/
# force materialization to be always considered
set @prefix_len = 6;
# BLOB == 16 (small blobs that could be stored in HEAP tables)
set @blob_len = 16;
set @suffix_len = @blob_len - @prefix_len;
create table t1_16 (a1 blob(16), a2 blob(16));
create table t2_16 (b1 blob(16), b2 blob(16));
create table t3_16 (c1 blob(16), c2 blob(16));
insert into t1_16 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_16 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_16 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_16 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_16 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_16 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_16 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select b1 from t2_16 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select b1 from t2_16 where b1 > '0');
# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_16
where (a1,a2) in (select b1, b2 from t2_16 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_16
where (a1,a2) in (select b1, b2 from t2_16 where b1 > '0');
# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');
# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 512)
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);
# BLOB column at the second (intermediate) level of nesting
explain extended
select * from t1
where concat(a1,'x') IN
(select left(a1,8) from t1_16
where (a1, a2) IN
(select t2_16.b1, t2_16.b2 from t2_16, t2
where t2.b2 = substring(t2_16.b2,1,6) and
t2.b1 IN (select c1 from t3 where c2 > '0')));
drop table t1_16, t2_16, t3_16;
# BLOB == 512 (CONVERT_IF_BIGGER_TO_BLOB == 512)
set @blob_len = 512;
set @suffix_len = @blob_len - @prefix_len;
create table t1_512 (a1 blob(512), a2 blob(512));
create table t2_512 (b1 blob(512), b2 blob(512));
create table t3_512 (c1 blob(512), c2 blob(512));
insert into t1_512 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_512 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_512 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_512 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_512 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_512 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_512 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select b1 from t2_512 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select b1 from t2_512 where b1 > '0');
# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_512
where (a1,a2) in (select b1, b2 from t2_512 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_512
where (a1,a2) in (select b1, b2 from t2_512 where b1 > '0');
# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');
# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 512)
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);
drop table t1_512, t2_512, t3_512;
# BLOB == 1024 (group_concat_max_len == 1024)
set @blob_len = 1024;
set @suffix_len = @blob_len - @prefix_len;
create table t1_1024 (a1 blob(1024), a2 blob(1024));
create table t2_1024 (b1 blob(1024), b2 blob(1024));
create table t3_1024 (c1 blob(1024), c2 blob(1024));
insert into t1_1024 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_1024 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_1024 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1024 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_1024 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1024 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1024 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select b1 from t2_1024 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select b1 from t2_1024 where b1 > '0');
# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1024
where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1024
where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0');
# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0');
# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 1024)
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);
drop table t1_1024, t2_1024, t3_1024;
# BLOB == 1025
set @blob_len = 1025;
set @suffix_len = @blob_len - @prefix_len;
create table t1_1025 (a1 blob(1025), a2 blob(1025));
create table t2_1025 (b1 blob(1025), b2 blob(1025));
create table t3_1025 (c1 blob(1025), c2 blob(1025));
insert into t1_1025 values
(concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_1025 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_1025 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1025 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_1025 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1025 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1025 values
(concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));
# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select b1 from t2_1025 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select b1 from t2_1025 where b1 > '0');
# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1025
where (a1,a2) in (select b1, b2 from t2_1025 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1025
where (a1,a2) in (select b1, b2 from t2_1025 where b1 > '0');
# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0');
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0');
# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 1025)
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);
drop table t1_1025, t2_1025, t3_1025;
# test for BIT fields
create table t1bit (a1 bit(3), a2 bit(3));
create table t2bit (b1 bit(3), b2 bit(3));
insert into t1bit values (b'000', b'100');
insert into t1bit values (b'001', b'101');
insert into t1bit values (b'010', b'110');
insert into t2bit values (b'001', b'101');
insert into t2bit values (b'010', b'110');
insert into t2bit values (b'110', b'111');
explain extended select bin(a1), bin(a2)
from t1bit
where (a1, a2) in (select b1, b2 from t2bit);
select bin(a1), bin(a2)
from t1bit
where (a1, a2) in (select b1, b2 from t2bit);
drop table t1bit, t2bit;
# test mixture of BIT and BLOB
create table t1bb (a1 bit(3), a2 blob(3));
create table t2bb (b1 bit(3), b2 blob(3));
insert into t1bb values (b'000', '100');
insert into t1bb values (b'001', '101');
insert into t1bb values (b'010', '110');
insert into t2bb values (b'001', '101');
insert into t2bb values (b'010', '110');
insert into t2bb values (b'110', '111');
explain extended select bin(a1), a2
from t1bb
where (a1, a2) in (select b1, b2 from t2bb);
select bin(a1), a2
from t1bb
where (a1, a2) in (select b1, b2 from t2bb);
drop table t1bb, t2bb;
drop table t1, t2, t3, t1i, t2i, t3i, columns;
/******************************************************************************
* Test the cache of the left operand of IN.
******************************************************************************/
# Test that default values of Cached_item are not used for comparison
create table t1 (s1 int);
create table t2 (s2 int);
insert into t1 values (5),(1),(0);
insert into t2 values (0), (1);
select s2 from t2 where s2 in (select s1 from t1);
drop table t1, t2;
create table t1 (a int not null, b int not null);
create table t2 (c int not null, d int not null);
create table t3 (e int not null);
# the first outer row has no matching inner row
insert into t1 values (1,10);
insert into t1 values (1,20);
insert into t1 values (2,10);
insert into t1 values (2,20);
insert into t1 values (2,30);
insert into t1 values (3,20);
insert into t1 values (4,40);
insert into t2 values (2,10);
insert into t2 values (2,20);
insert into t2 values (2,40);
insert into t2 values (3,20);
insert into t2 values (4,10);
insert into t2 values (5,10);
insert into t3 values (10);
insert into t3 values (10);
insert into t3 values (20);
insert into t3 values (30);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
select a from t1 where a in (select c from t2 where d >= 20);
create index it1a on t1(a);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
select a from t1 where a in (select c from t2 where d >= 20);
# the first outer row has a matching inner row
insert into t2 values (1,10);
explain extended
select a from t1 where a in (select c from t2 where d >= 20);
select a from t1 where a in (select c from t2 where d >= 20);
# cacheing for IN predicates inside a having clause - here the cached
# items are changed to point to temporary tables.
explain extended
select a from t1 group by a having a in (select c from t2 where d >= 20);
select a from t1 group by a having a in (select c from t2 where d >= 20);
# create an index that can be used for the outer query GROUP BY
create index iab on t1(a, b);
explain extended
select a from t1 group by a having a in (select c from t2 where d >= 20);
select a from t1 group by a having a in (select c from t2 where d >= 20);
explain extended
select a from t1 group by a
having a in (select c from t2 where d >= some(select e from t3 where max(b)=e));
select a from t1 group by a
having a in (select c from t2 where d >= some(select e from t3 where max(b)=e));
explain extended
select a from t1
where a in (select c from t2 where d >= some(select e from t3 where b=e));
select a from t1
where a in (select c from t2 where d >= some(select e from t3 where b=e));
drop table t1, t2, t3;
#
# BUG#36133 "Assertion `exec_method != MATERIALIZATION || (exec_method == MATERIALIZATION &&"
#
create table t2 (a int, b int, key(a), key(b));
insert into t2 values (3,3),(3,3),(3,3);
select 1 from t2 where
t2.a > 1
or
t2.a = 3 and not t2.a not in (select t2.b from t2);
drop table t2;
#
# BUG#37896 Assertion on entry of Item_in_subselect::exec on subquery with AND NOT
#
create table t1 (a1 int key);
create table t2 (b1 int);
insert into t1 values (5);
# Query with group by, executed via materialization
explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
# Query with group by, executed via IN=>EXISTS
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch='default,materialization=off';
explain select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
select min(a1) from t1 where 7 in (select b1 from t2 group by b1);
# Executed with materialization
set @@optimizer_switch='default,semijoin=off';
explain select min(a1) from t1 where 7 in (select b1 from t2);
select min(a1) from t1 where 7 in (select b1 from t2);
# Executed with semi-join. Notice, this time we get a different result (NULL).
# This is the only correct result of all four queries. This difference is
# filed as BUG#40037.
set @@optimizer_switch='default,materialization=off';
-- echo # with MariaDB and MWL#90, this particular case is solved:
explain select min(a1) from t1 where 7 in (select b1 from t2);
select min(a1) from t1 where 7 in (select b1 from t2);
-- echo # but when we go around MWL#90 code, the problem still shows up:
explain select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
select min(a1) from t1 where 7 in (select b1 from t2) or 2> 4;
set @@optimizer_switch= @save_optimizer_switch;
drop table t1,t2;
#
# BUG#36752 "subquery materialization produces wrong results when comparing different types"
#
create table t1 (a char(2), b varchar(10));
insert into t1 values ('a', 'aaa');
insert into t1 values ('aa', 'aaaa');
explain select a,b from t1 where b in (select a from t1);
select a,b from t1 where b in (select a from t1);
prepare st1 from "select a,b from t1 where b in (select a from t1)";
execute st1;
execute st1;
drop table t1;
#
# Bug #44303 Assertion failures in Field_new_decimal::store_decimal
# when executing materialized InsideOut semijoin
#
CREATE TABLE t1 (f1 INT, f2 DECIMAL(5,3)) ENGINE=MyISAM;
INSERT INTO t1 (f1, f2) VALUES (1, 1.789);
INSERT INTO t1 (f1, f2) VALUES (13, 1.454);
INSERT INTO t1 (f1, f2) VALUES (10, 1.668);
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1, 1.789);
INSERT INTO t2 VALUES (13, 1.454);
set @save_optimizer_switch=@@optimizer_switch;
SET @@optimizer_switch='default,semijoin=on,materialization=on';
EXPLAIN SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
SELECT COUNT(*) FROM t1 WHERE (f1,f2) IN (SELECT f1,f2 FROM t2);
set @@optimizer_switch= @save_optimizer_switch;
DROP TABLE t1, t2;
#
# BUG#46548 IN-subqueries return 0 rows with materialization=on
#
CREATE TABLE t1 (
pk int,
a varchar(1),
b varchar(4),
c varchar(4),
d varchar(4),
PRIMARY KEY (pk)
);
INSERT INTO t1 VALUES (1,'o','ffff','ffff','ffoo'),(2,'f','ffff','ffff','ffff');
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1,'i','iiii','iiii','iiii'),(2,'f','ffff','ffff','ffff');
set @save_optimizer_switch=@@optimizer_switch;
SET @@optimizer_switch='default,semijoin=on,materialization=on';
EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
SELECT pk FROM t1 WHERE (b,c,d) IN (SELECT b,c,d FROM t2 WHERE pk > 0);
DROP TABLE t1, t2;
set optimizer_switch=@save_optimizer_switch;
--echo #
--echo # BUG#50019: Wrong result for IN-subquery with materialization
--echo #
create table t1(i int);
insert into t1 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
create table t2(i int);
insert into t2 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
create table t3(i int);
insert into t3 values (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
select * from t1 where t1.i in (select t2.i from t2 join t3 where t2.i + t3.i = 5);
set @save_optimizer_switch=@@optimizer_switch;
set session optimizer_switch='materialization=off';
select * from t1 where t1.i in (select t2.i from t2 join t3 where t2.i + t3.i = 5);
set session optimizer_switch=@save_optimizer_switch;
drop table t1, t2, t3;
#
# Test that the contentes of the temp table of a materialized subquery is
# cleanup up between PS reexecutions.
#
create table t0 (a int);
insert into t0 values (0),(1),(2);
create table t1 (a int);
insert into t1 values (0),(1),(2);
explain select a, a in (select a from t1) from t0;
select a, a in (select a from t1) from t0;
prepare s from 'select a, a in (select a from t1) from t0';
execute s;
update t1 set a=123;
execute s;
drop table t0, t1;
set optimizer_switch='firstmatch=on';
sql-bench/test-table-elimination.sh
View file @ 62bf7f61
#!@PERL@
# Test of table elimination feature
......
sql/item_cmpfunc.cc
View file @ 62bf7f61
......@@ -5761,32 +5761,27 @@ Item_field* Item_equal::get_first(Item_field *field)
}
else
{
#if 0
/*
The field is not in SJ-Materialization nest. We must return the first
field that's not embedded in a SJ-Materialization nest.
Example: suppose we have a join order:
field in the join order. The field may be inside a semi-join nest, i.e
a join order may look like this:
SJ-Mat(it1 it2) ot1 ot2
and equality ot2.col = ot1.col = it2.col
If we're looking for best substitute for 'ot2.col', we should pick ot1.col
and not it2.col, because when we run a join between ot1 and ot2
execution of SJ-Mat(...) has already finished and we can't rely on the
value of it*.*.
psergey-fix-fix: ^^ THAT IS INCORRECT ^^. Pick the first, whatever that
is.
where we're looking what to substitute ot2.col for. In this case we must
still return it1.col, here's a proof why:
First let's note that either it1.col or it2.col participates in
subquery's IN-equality. It can't be otherwise, because materialization is
only applicable to uncorrelated subqueries, so the only way we could
infer "it1.col=ot1.col" is from IN-equality. Ok, so IN-eqality has
it1.col or it2.col on its inner side. it1.col is first such item in the
join order, so it's not possible for SJ-Mat to be
SJ-Materialization-lookup, it is SJ-Materialization-Scan. The scan part
of this strategy will unpack value of it1.col=it2.col into it1.col
(that's the first equal item inside the subquery), and we'll be able to
get it from there. qed.
*/
while ((item= it++))
{
TABLE_LIST *emb_nest= item->field->table->pos_in_table_list->embedding;
if (!emb_nest || !emb_nest->sj_mat_info ||
!emb_nest->sj_mat_info->is_used)
{
return item;
}
}
#endif
return fields.head();
}
// Shouldn't get here.
......
sql/opt_subselect.cc
View file @ 62bf7f61
......@@ -237,7 +237,8 @@ int check_and_do_in_subquery_rewrites(JOIN *join)
with jtbm strategy
*/
if (in_subs->exec_method == Item_in_subselect::MATERIALIZATION &&
thd->thd_marker.emb_on_expr_nest == (TABLE_LIST*)0x1)
thd->thd_marker.emb_on_expr_nest == (TABLE_LIST*)0x1 &&
optimizer_flag(thd, OPTIMIZER_SWITCH_SEMIJOIN))
{
in_subs->emb_on_expr_nest= thd->thd_marker.emb_on_expr_nest;
in_subs->is_flattenable_semijoin= FALSE;
......
sql/sql_select.cc
View file @ 62bf7f61
......@@ -4287,7 +4287,6 @@ best_access_path(JOIN *join,
double tmp;
ha_rows rec;
bool best_uses_jbuf= FALSE;
Item_in_subselect* jtbm_subselect= s->table->pos_in_table_list->jtbm_subselect;
Loose_scan_opt loose_scan_opt;
DBUG_ENTER("best_access_path");
......@@ -4696,7 +4695,7 @@ best_access_path(JOIN *join,
!((s->table->file->ha_table_flags() & HA_TABLE_SCAN_ON_INDEX) && // (3)
! s->table->covering_keys.is_clear_all() && best_key && !s->quick) &&// (3)
!(s->table->force_index && best_key && !s->quick) && // (4)
!(best_key && jtbm_subselect)) // (5)
!(best_key && s->table->pos_in_table_list->jtbm_subselect)) // (5)
{ // Check full join
ha_rows rnd_records= s->found_records;
/*
......
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