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set optimizer_switch='semijoin=on,materialization=on,firstmatch=on,loosescan=on,index_condition_pushdown=on,mrr=on'; set @old_opt_switch=@@optimizer_switch; set optimizer_switch='subquery_materialization_cost_based=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 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`b1` = `test`.`t1`.`a1`) and (`test`.`t1`.`a1` > '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 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`b1` = `test`.`t1`.`a1`) and (`test`.`t1`.`a1` > '0')) 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 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`b2` = `test`.`t1`.`a2`) and (`test`.`t2`.`b1` = `test`.`t1`.`a1`) and (`test`.`t1`.`a1` > '0')) 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 Using where 2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ 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#2 */ select `test`.`t2`.`b1`,min(`test`.`t2`.`b2`) from `test`.`t2` where (`test`.`t2`.`b1` > '0') group by `test`.`t2`.`b1` having 1 ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on <auto_key> where ((`test`.`t1`.`a1` = `materialized-subquery`.`b1`) and (`test`.`t1`.`a2` = `materialized-subquery`.`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 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 SIMPLE t2i index it2i1,it2i3 it2i1 9 NULL 5 50.00 Using where; Using index; LooseScan 1 SIMPLE t1i ref it1i1,it1i3 it1i1 9 test.t2i.b1 1 100.00 NULL Warnings: Note 1003 /* select#1 */ 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 SIMPLE t2i index it2i1,it2i3 it2i1 9 NULL 5 50.00 Using where; Using index; LooseScan 1 SIMPLE t1i ref it1i1,it1i3 it1i1 9 test.t2i.b1 1 100.00 NULL Warnings: Note 1003 /* select#1 */ 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' 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 SIMPLE t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 50.00 Using where; Using index; LooseScan 1 SIMPLE t1i ref it1i1,it1i2,it1i3 it1i1 9 test.t2i.b1 1 100.00 Using where Warnings: Note 1003 /* select#1 */ 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 SIMPLE t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 50.00 Using where; Using index; LooseScan 1 SIMPLE t1i ref it1i1,it1i2,it1i3 it1i1 9 test.t2i.b1 1 100.00 Using where Warnings: Note 1003 /* select#1 */ 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' 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 NULL it1i3 18 NULL 3 100.00 Using where; Using index 2 SUBQUERY t2i range it2i1,it2i3 it2i3 18 NULL 3 100.00 Using where; Using index for group-by Warnings: Note 1003 /* select#1 */ 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#2 */ select `test`.`t2i`.`b1`,min(`test`.`t2i`.`b2`) from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` having 1 ), <primary_index_lookup>(`test`.`t1i`.`a1` in <temporary table> on <auto_key> where ((`test`.`t1i`.`a1` = `materialized-subquery`.`b1`) and (`test`.`t1i`.`a2` = `materialized-subquery`.`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 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 Using where 2 SUBQUERY t2i range it2i1,it2i3 it2i3 9 NULL 3 100.00 Using index for group-by Warnings: Note 1003 /* select#1 */ 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#2 */ select `test`.`t2i`.`b1`,max(`test`.`t2i`.`b2`) from `test`.`t2i` group by `test`.`t2i`.`b1` having 1 ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on <auto_key> where ((`test`.`t1`.`a1` = `materialized-subquery`.`b1`) and (`test`.`t1`.`a2` = `materialized-subquery`.`max(b2)`))))) 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 Using where 2 SUBQUERY t2i range it2i1,it2i3 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 Using where 2 SUBQUERY t2i range it2i1,it2i3 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 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#1 */ 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#2 */ select `test`.`t2i`.`b1`,min(`test`.`t2i`.`b2`) from `test`.`t2i` where (`test`.`t2i`.`b1` > '0') group by `test`.`t2i`.`b1` having 1 ), <primary_index_lookup>(`test`.`t1`.`a1` in <temporary table> on <auto_key> where ((`test`.`t1`.`a1` = `materialized-subquery`.`b1`) and (`test`.`t1`.`a2` = `materialized-subquery`.`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' 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 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`b2` = `test`.`t1`.`a2`) and (`test`.`t2`.`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 SIMPLE t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 50.00 Using where; Using index; LooseScan 1 SIMPLE t1i ref it1i1,it1i2,it1i3 it1i1 9 test.t2i.b1 1 100.00 Using where Warnings: Note 1003 /* select#1 */ 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`)) 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 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where 1 SIMPLE <subquery3> eq_ref <auto_key> <auto_key> 18 test.t1.a1,test.t1.a2 1 100.00 NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(<subquery3>); Using join buffer (Block Nested Loop) 3 MATERIALIZED t3 ALL NULL NULL NULL NULL 4 100.00 Using where 3 MATERIALIZED t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2i` join `test`.`t3`) semi join (`test`.`t2`) where ((`<subquery3>`.`c2` = `test`.`t1`.`a2`) and (`test`.`t2`.`b2` = `test`.`t1`.`a2`) and (`test`.`t2i`.`b2` = `test`.`t3`.`c2`) and (`<subquery3>`.`c1` = `test`.`t1`.`a1`) and (`test`.`t2`.`b1` = `test`.`t1`.`a1`) and (`test`.`t2i`.`b1` = `test`.`t3`.`c1`) and (`test`.`t3`.`c2` > '0') and (`test`.`t1`.`a1` > '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 SIMPLE t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 50.00 Using where; Using index; LooseScan 1 SIMPLE t1i ref it1i1,it1i2,it1i3 it1i1 9 test.t2i.b1 1 100.00 Using where 1 SIMPLE t3i ref it3i1,it3i2,it3i3 it3i1 9 test.t2i.b1 1 100.00 Using where 1 SIMPLE t2i ref it2i1,it2i2,it2i3 it2i3 18 test.t2i.b1,test.t2i.b2 2 100.00 Using index; FirstMatch(t1i) Warnings: Note 1003 /* select#1 */ select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` semi join (`test`.`t2i` join `test`.`t3i`) semi join (`test`.`t2i`) where ((`test`.`t1i`.`a2` = `test`.`t2i`.`b2`) and (`test`.`t3i`.`c2` = `test`.`t2i`.`b2`) and (`test`.`t2i`.`b2` = `test`.`t2i`.`b2`) and (`test`.`t1i`.`a1` = `test`.`t2i`.`b1`) and (`test`.`t3i`.`c1` = `test`.`t2i`.`b1`) and (`test`.`t2i`.`b1` = `test`.`t2i`.`b1`) and (`test`.`t2i`.`b2` > '0') and (`test`.`t2i`.`b1` > '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 Using where 1 PRIMARY <subquery5> eq_ref <auto_key> <auto_key> 18 test.t1.a1,test.t1.a2 1 100.00 NULL 1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(<subquery5>); Using join buffer (Block Nested Loop) 5 MATERIALIZED t3 ALL NULL NULL NULL NULL 4 100.00 Using where 5 MATERIALIZED t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer (Block Nested Loop) 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#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2i` join `test`.`t3`) semi join (`test`.`t2`) where ((`<subquery5>`.`c2` = `test`.`t1`.`a2`) and (`test`.`t2`.`b2` = `test`.`t1`.`a2`) and (`test`.`t2i`.`b2` = `test`.`t3`.`c2`) and (`<subquery5>`.`c1` = `test`.`t1`.`a1`) and (`test`.`t2`.`b1` = `test`.`t1`.`a1`) and (`test`.`t2i`.`b1` = `test`.`t3`.`c1`) and (`test`.`t3`.`c2` > '0') and (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (/* select#3 */ select `test`.`t3`.`c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on <auto_key> where ((`test`.`t2`.`b2` = `materialized-subquery`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (/* select#4 */ select `test`.`t3`.`c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on <auto_key> where ((`test`.`t2`.`b2` = `materialized-subquery`.`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 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 Using where 1 PRIMARY <subquery5> eq_ref <auto_key> <auto_key> 18 test.t1.a1,test.t1.a2 1 100.00 NULL 1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(<subquery5>); Using join buffer (Block Nested Loop) 5 MATERIALIZED t3c ALL NULL NULL NULL NULL 4 100.00 Using where 5 MATERIALIZED t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer (Block Nested Loop) 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#1 */ 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 ((`<subquery5>`.`c2` = `test`.`t1`.`a2`) and (`test`.`t2`.`b2` = `test`.`t1`.`a2`) and (`test`.`t2i`.`b2` = `test`.`t3c`.`c2`) and (`<subquery5>`.`c1` = `test`.`t1`.`a1`) and (`test`.`t2`.`b1` = `test`.`t1`.`a1`) and (`test`.`t2i`.`b1` = `test`.`t3c`.`c1`) and (<in_optimizer>(`test`.`t2`.`b2`,<exists>(/* select#3 */ select 1 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#4 */ select `test`.`t3b`.`c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on <auto_key> where ((`test`.`t2`.`b2` = `materialized-subquery`.`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 t1 ALL NULL NULL NULL NULL 3 100.00 Using where 1 PRIMARY <subquery5> eq_ref <auto_key> <auto_key> 18 test.t1.a1,test.t1.a2 1 100.00 NULL 1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(<subquery5>); Using join buffer (Block Nested Loop) 5 MATERIALIZED t3 ALL NULL NULL NULL NULL 4 100.00 Using where 5 MATERIALIZED t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer (Block Nested Loop) 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 7 UNION t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 50.00 Using where; Using index; LooseScan 7 UNION t1i ref it1i1,it1i2,it1i3 it1i1 9 test.t2i.b1 1 100.00 Using where 7 UNION t3i ref it3i1,it3i2,it3i3 it3i1 9 test.t2i.b1 1 100.00 Using where 7 UNION t2i ref it2i1,it2i2,it2i3 it2i3 18 test.t2i.b1,test.t2i.b2 2 100.00 Using index; FirstMatch(t1i) NULL UNION RESULT <union1,7> ALL NULL NULL NULL NULL NULL NULL Using temporary Warnings: Note 1003 (/* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2i` join `test`.`t3`) semi join (`test`.`t2`) where ((`<subquery5>`.`c2` = `test`.`t1`.`a2`) and (`test`.`t2`.`b2` = `test`.`t1`.`a2`) and (`test`.`t2i`.`b2` = `test`.`t3`.`c2`) and (`<subquery5>`.`c1` = `test`.`t1`.`a1`) and (`test`.`t2`.`b1` = `test`.`t1`.`a1`) and (`test`.`t2i`.`b1` = `test`.`t3`.`c1`) and (`test`.`t3`.`c2` > '0') and (<in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (/* select#3 */ select `test`.`t3`.`c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%02') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on <auto_key> where ((`test`.`t2`.`b2` = `materialized-subquery`.`c2`))))) or <in_optimizer>(`test`.`t2`.`b2`,`test`.`t2`.`b2` in ( <materialize> (/* select#4 */ select `test`.`t3`.`c2` from `test`.`t3` where (`test`.`t3`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on <auto_key> where ((`test`.`t2`.`b2` = `materialized-subquery`.`c2`)))))))) union (/* select#7 */ select `test`.`t1i`.`a1` AS `a1`,`test`.`t1i`.`a2` AS `a2` from `test`.`t1i` semi join (`test`.`t2i` join `test`.`t3i`) semi join (`test`.`t2i`) where ((`test`.`t1i`.`a2` = `test`.`t2i`.`b2`) and (`test`.`t3i`.`c2` = `test`.`t2i`.`b2`) and (`test`.`t2i`.`b2` = `test`.`t2i`.`b2`) and (`test`.`t1i`.`a1` = `test`.`t2i`.`b1`) and (`test`.`t3i`.`c1` = `test`.`t2i`.`b1`) and (`test`.`t2i`.`b1` = `test`.`t2i`.`b1`) and (`test`.`t2i`.`b2` > '0') and (`test`.`t2i`.`b1` > '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 <subquery4> eq_ref <auto_key> <auto_key> 18 test.t1.a1,test.t1.a2 1 100.00 NULL 4 MATERIALIZED t3 ALL NULL NULL NULL NULL 4 100.00 Using where 4 MATERIALIZED t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer (Block Nested Loop) 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 Using temporary Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2i` join `test`.`t3`) where ((`<subquery4>`.`c2` = `test`.`t1`.`a2`) and (`test`.`t2i`.`b2` = `test`.`t3`.`c2`) and (`<subquery4>`.`c1` = `test`.`t1`.`a1`) and (`test`.`t2i`.`b1` = `test`.`t3`.`c1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(/* select#2 */ select 1,1 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#3 */ select 1,1 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 (Block Nested Loop) 1 PRIMARY <subquery4> eq_ref <auto_key> <auto_key> 18 test.t1.a1,test.t3.c2 1 100.00 NULL 4 MATERIALIZED t3 ALL NULL NULL NULL NULL 4 100.00 Using where 4 MATERIALIZED t2i index it2i1,it2i2,it2i3 it2i3 18 NULL 5 80.00 Using where; Using index; Using join buffer (Block Nested Loop) 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 Using temporary Warnings: Note 1003 /* select#1 */ 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 ((`<subquery4>`.`c2` = `test`.`t3`.`c2`) and (`test`.`t2i`.`b2` = `test`.`t3`.`c2`) and (`test`.`t3`.`c1` = `test`.`t1`.`a1`) and (`<subquery4>`.`c1` = `test`.`t1`.`a1`) and (`test`.`t2i`.`b1` = `test`.`t3`.`c1`) and <in_optimizer>((`test`.`t1`.`a1`,`test`.`t1`.`a2`),<exists>(/* select#2 */ select 1,1 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#3 */ select 1,1 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 Using temporary Warnings: Note 1003 /* select#1 */ select `test`.`t3`.`c1` AS `c1`,`test`.`t3`.`c2` AS `c2` from `test`.`t3` where <in_optimizer>(`test`.`t3`.`c1`,<exists>(/* select#2 */ select 1 from `test`.`t1` where ((`test`.`t1`.`a1` > '0') and (<cache>(`test`.`t3`.`c1`) = `test`.`t1`.`a1`)) union /* select#3 */ select 1 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 Using where; 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; End temporary; Using join buffer (Block Nested Loop) 1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(t3c); Using join buffer (Block Nested Loop) 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#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` semi join (`test`.`t2i` join `test`.`t3` `t3c`) semi join (`test`.`t2`) 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#3 */ select 1 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#4 */ select `test`.`t3b`.`c2` from `test`.`t3` `t3b` where (`test`.`t3b`.`c2` like '%03') ), <primary_index_lookup>(`test`.`t2`.`b2` in <temporary table> on <auto_key> where ((`test`.`t2`.`b2` = `materialized-subquery`.`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#1 */ 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#2 */ select '1 - 01','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#1 */ 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#2 */ select '1 - 01','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 NULL 2 SUBQUERY columns index NULL PRIMARY 4 NULL 2 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` group by (/* select#2 */ select `test`.`columns`.`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#1 */ 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 <if>(outer_field_is_not_null, (<cache>(`test`.`t1`.`a1`) = `test`.`columns`.`col`), true)))) 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 NULL 2 SUBQUERY columns index NULL PRIMARY 4 NULL 2 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2` from `test`.`t1` order by (/* select#2 */ select `test`.`columns`.`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 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); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1bit ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2bit ALL NULL NULL NULL NULL 3 100.00 Using where; FirstMatch(t1bit); Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ 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 ((`test`.`t2bit`.`b2` = `test`.`t1bit`.`a2`) and (`test`.`t2bit`.`b1` = `test`.`t1bit`.`a1`)) 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 SIMPLE t1bb ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2bb ALL NULL NULL NULL NULL 3 100.00 Using where; FirstMatch(t1bb); Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ 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 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 NULL 1 SIMPLE t1 ALL NULL NULL NULL NULL 7 100.00 Using where; Using join buffer (Block Nested Loop) 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t1`.`a` = `<subquery2>`.`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 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 NULL 1 SIMPLE t1 ref it1a it1a 4 <subquery2>.c 2 100.00 Using index 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 6 100.00 Using where Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t1`.`a` = `<subquery2>`.`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 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 NULL 1 SIMPLE t1 ref it1a it1a 4 <subquery2>.c 2 100.00 Using index 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 7 100.00 Using where Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t1`.`a` = `<subquery2>`.`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 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 it1a 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#1 */ 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#2 */ select `test`.`t2`.`c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on <auto_key> where ((`test`.`t1`.`a` = `materialized-subquery`.`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 it1a,iab 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#1 */ 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#2 */ select `test`.`t2`.`c` from `test`.`t2` where (`test`.`t2`.`d` >= 20) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on <auto_key> where ((`test`.`t1`.`a` = `materialized-subquery`.`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 it1a,iab 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#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` group by `test`.`t1`.`a` having <in_optimizer>(`test`.`t1`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t2` where (<nop>(<in_optimizer>(`test`.`t2`.`d`,<exists>(/* select#3 */ select 1 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#1 */ 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#3 */ select 1 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 1 2 2 2 3 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 SIMPLE t1 system NULL NULL NULL NULL 1 NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; FirstMatch(t1) select min(a1) from t1 where 7 in (select b1 from t2 group by b1); min(a1) NULL 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 SIMPLE t1 system NULL NULL NULL NULL 1 NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; FirstMatch(t1) select min(a1) from t1 where 7 in (select b1 from t2); min(a1) NULL 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 SIMPLE t1 ALL NULL NULL NULL NULL 2 NULL 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) 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 (a varchar(5), b varchar(10)); INSERT INTO t1 VALUES ('AAA', 5), ('BBB', 4), ('BBB', 1), ('CCC', 2), ('CCC', 7), ('AAA', 2), ('AAA', 4), ('BBB', 3), ('AAA', 8); SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a); a b BBB 4 CCC 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 Using where 2 SUBQUERY t1 ALL NULL NULL NULL NULL 9 Using temporary; Using filesort ALTER TABLE t1 ADD INDEX(a); FLUSH STATUS; SELECT * FROM t1 WHERE (a,b) = ANY (SELECT a, max(b) FROM t1 GROUP BY a); a b BBB 4 CCC 7 AAA 8 SHOW SESSION STATUS LIKE 'Sort_scan%'; Variable_name Value Sort_scan 1 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 Using where 2 SUBQUERY t1 ALL a NULL NULL NULL 9 Using temporary; Using filesort DROP TABLE t1; 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 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 FirstMatch 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` semi join (`test`.`t1`) where 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 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using where; FirstMatch 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` semi join (`test`.`t1`) where (`test`.`t1`.`a` > 3) DROP TABLE t1; # # BUG#49630: Segfault in select_describe() with double # nested subquery and materialization # CREATE TABLE t1 (t1i int); CREATE TABLE t2 (t2i int); CREATE TABLE t3 (t3i int); CREATE TABLE t4 (t4i int); INSERT INTO t1 VALUES (1); INSERT INTO t2 VALUES (1),(2); INSERT INTO t3 VALUES (1),(2); INSERT INTO t4 VALUES (1),(2); EXPLAIN SELECT t1i FROM t1 JOIN t4 ON t1i=t4i WHERE (t1i) IN ( SELECT t2i FROM t2 WHERE (t2i) IN ( SELECT t3i FROM t3 GROUP BY t3i ) ); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 system NULL NULL NULL NULL 1 NULL 1 SIMPLE t4 ALL NULL NULL NULL NULL 2 Using where 1 SIMPLE <subquery2> const <auto_key> <auto_key> 5 const 1 NULL 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 Using where 2 MATERIALIZED t3 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (Block Nested Loop) DROP TABLE t1,t2,t3,t4; # # BUG#46680 - Assertion failed in file item_subselect.cc, # line 305 crashing on HAVING subquery # # Create tables # CREATE TABLE t1 ( pk INT, v VARCHAR(1) DEFAULT NULL, PRIMARY KEY(pk) ); CREATE TABLE t2 LIKE t1; CREATE TABLE t3 LIKE t1; CREATE TABLE empty1 (a int); INSERT INTO t1 VALUES (1,'c'),(2,NULL); INSERT INTO t2 VALUES (3,'m'),(4,NULL); INSERT INTO t3 VALUES (1,'n'); # # 1) Test that subquery materialization is setup for query with # premature optimize() exit due to "Impossible WHERE" # SELECT MIN(t2.pk) FROM t2 JOIN t1 ON t1.pk=t2.pk WHERE 'j' HAVING ('m') IN ( SELECT v FROM t2); MIN(t2.pk) NULL Warnings: Warning 1292 Truncated incorrect INTEGER value: 'j' EXPLAIN SELECT MIN(t2.pk) FROM t2 JOIN t1 ON t1.pk=t2.pk WHERE 'j' HAVING ('m') IN ( SELECT v 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 2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where Warnings: Warning 1292 Truncated incorrect INTEGER value: 'j' # # 2) Test that subquery materialization is setup for query with # premature optimize() exit due to "No matching min/max row" # SELECT MIN(t2.pk) FROM t2 WHERE t2.pk>10 HAVING ('m') IN ( SELECT v FROM t2); MIN(t2.pk) NULL EXPLAIN SELECT MIN(t2.pk) FROM t2 WHERE t2.pk>10 HAVING ('m') IN ( SELECT v FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No matching min/max row 2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where # # 3) Test that subquery materialization is setup for query with # premature optimize() exit due to "Select tables optimized away" # SELECT MIN(pk) FROM t1 WHERE pk=NULL HAVING ('m') IN ( SELECT v FROM t2); MIN(pk) NULL EXPLAIN SELECT MIN(pk) FROM t1 WHERE pk=NULL HAVING ('m') IN ( SELECT v 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 2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where # # 4) Test that subquery materialization is setup for query with # premature optimize() exit due to "No matching row in const table" # SELECT MIN(a) FROM (SELECT a FROM empty1) tt HAVING ('m') IN ( SELECT v FROM t2); MIN(a) NULL EXPLAIN SELECT MIN(a) FROM (SELECT a FROM empty1) tt HAVING ('m') IN ( SELECT v FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 0 const row not found 3 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where 2 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table # # 5) Test that subquery materialization is setup for query with # premature optimize() exit due to "Impossible WHERE noticed # after reading const tables" # SELECT min(t1.pk) FROM t1 WHERE t1.pk IN (SELECT 1 from t3 where pk>10) HAVING ('m') IN ( SELECT v FROM t2); min(t1.pk) NULL EXPLAIN SELECT min(t1.pk) FROM t1 WHERE t1.pk IN (SELECT 1 from t3 where pk>10) HAVING ('m') IN ( SELECT v FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1 Using index 1 PRIMARY t3 index PRIMARY PRIMARY 4 NULL 1 Using where; Using index; FirstMatch(t1) 3 SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where # # Cleanup for BUG#46680 # DROP TABLE IF EXISTS t1,t2,t3,empty1; # # BUG#52344 - Subquery materialization: # Assertion if subquery in on-clause of outer join # CREATE TABLE t1 (i INTEGER); INSERT INTO t1 VALUES (10); CREATE TABLE t2 (j INTEGER); INSERT INTO t2 VALUES (5); CREATE TABLE t3 (k INTEGER); EXPLAIN SELECT i, j FROM t1 LEFT JOIN t2 ON (j) IN (SELECT k FROM t3); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 system NULL NULL NULL NULL 1 NULL 1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Start temporary 1 SIMPLE t2 ALL NULL NULL NULL NULL 1 Using where; End temporary SELECT i, j FROM t1 LEFT JOIN t2 ON (j) IN (SELECT k FROM t3); i j 10 NULL EXPLAIN SELECT i, j FROM t1 LEFT JOIN t2 ON (j) IN (SELECT max(k) FROM t3); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 NULL 1 PRIMARY t2 system NULL NULL NULL NULL 1 NULL 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT i, j FROM t1 LEFT JOIN t2 ON (j) IN (SELECT max(k) FROM t3); i j 10 NULL DROP TABLE t1, t2, t3; # End BUG#52344 CREATE TABLE t1 ( pk INTEGER AUTO_INCREMENT, col_int_nokey INTEGER, col_int_key INTEGER, col_varchar_key VARCHAR(1), PRIMARY KEY (pk), KEY (col_int_key), KEY (col_varchar_key, col_int_key) ) ; INSERT INTO t1 ( col_int_key, col_int_nokey, col_varchar_key ) VALUES (2, NULL, 'w'), (9, 7, 'm'), (3, 9, 'm'), (9, 7, 'k'), (NULL, 4, 'r'), (9, 2, 't'), (3, 6, 'j'), (8, 8, 'u'), (8, NULL, 'h'), (53, 5, 'o'), (0, NULL, NULL), (5, 6, 'k'), (166, 188, 'e'), (3, 2, 'n'), (0, 1, 't'), (1, 1, 'c'), (9, 0, 'm'), (5, 9, 'y'), (6, NULL, 'f'), (2, 4, 'd') ; SELECT table2.col_varchar_key AS field1, table2.col_int_nokey AS field2 FROM ( t1 AS table1 LEFT OUTER JOIN t1 AS table2 ON (table2.col_varchar_key = table1.col_varchar_key ) ) WHERE table1.pk = 6 HAVING ( field2 ) IN ( SELECT SUBQUERY2_t2.col_int_nokey AS SUBQUERY2_field2 FROM ( t1 AS SUBQUERY2_t1 JOIN t1 AS SUBQUERY2_t2 ON (SUBQUERY2_t2.col_varchar_key = SUBQUERY2_t1.col_varchar_key ) ) ) ORDER BY field2 ; field1 field2 t 1 t 2 drop table t1; # # BUG#53103: MTR test ps crashes in optimize_cond() # when running with --debug # CREATE TABLE t1(track varchar(15)); INSERT INTO t1 VALUES ('CAD'), ('CAD'); PREPARE STMT FROM "SELECT 1 FROM t1 WHERE track IN (SELECT track FROM t1 GROUP BY track HAVING track>='CAD')"; EXECUTE STMT ; 1 1 1 EXECUTE STMT ; 1 1 1 DEALLOCATE PREPARE STMT; DROP TABLE t1; # End of BUG#53103 # # BUG#54511 - Assertion failed: cache != 0L in file # sql_select.cc::sub_select_cache on HAVING # CREATE TABLE t1 (i int(11)); CREATE TABLE t2 (c char(1)); CREATE TABLE t3 (c char(1)); INSERT INTO t1 VALUES (1), (2); INSERT INTO t2 VALUES ('a'), ('b'); INSERT INTO t3 VALUES ('x'), ('y'); SELECT COUNT( i ),i FROM t1 HAVING ('c') IN (SELECT t2.c FROM (t2 JOIN t3)); COUNT( i ) i DROP TABLE t1,t2,t3; # End BUG#54511 # # BUG#56367 - Assertion exec_method != EXEC_MATERIALIZATION... # on subquery in FROM # CREATE TABLE t1 (a INTEGER); CREATE TABLE t2 (b INTEGER); INSERT INTO t2 VALUES (1); explain SELECT a FROM ( SELECT t1.* FROM t1 LEFT JOIN t2 ON t1.a > 3 OR t2.b IN (SELECT a FROM t1) ) table1; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> system NULL NULL NULL NULL 0 const row not found 2 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table 3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT a FROM ( SELECT t1.* FROM t1 LEFT JOIN t2 ON t1.a > 3 OR t2.b IN (SELECT a FROM t1) ) table1; a DROP TABLE t1, t2; # End BUG#56367 # # Bug#59833 - materialization=on/off leads to different result set # when using IN # CREATE TABLE t1 ( pk int NOT NULL, f1 int DEFAULT NULL, PRIMARY KEY (pk) ) ENGINE=MyISAM; CREATE TABLE t2 ( pk int NOT NULL, f1 int DEFAULT NULL, PRIMARY KEY (pk) ) ENGINE=MyISAM; INSERT INTO t1 VALUES (10,0); INSERT INTO t2 VALUES (10,0),(11,0); explain SELECT * FROM t1 JOIN t2 USING (f1) WHERE t1.f1 IN (SELECT t1.pk FROM t1 ORDER BY t1.f1); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables SELECT * FROM t1 JOIN t2 USING (f1) WHERE t1.f1 IN (SELECT t1.pk FROM t1 ORDER BY t1.f1); f1 pk pk DROP TABLE t1, t2; # End Bug#59833 # # Bug#11852644 - CRASH IN ITEM_REF::SAVE_IN_FIELD ON SELECT DISTINCT # CREATE TABLE t1 ( col_varchar_key varchar(1) DEFAULT NULL, col_varchar_nokey varchar(1) DEFAULT NULL, KEY col_varchar_key (col_varchar_key)) ; INSERT INTO t1 VALUES ('v','v'),('r','r'); CREATE TABLE t2 ( col_varchar_key varchar(1) DEFAULT NULL, col_varchar_nokey varchar(1) DEFAULT NULL, KEY col_varchar_key(col_varchar_key)) ; INSERT INTO t2 VALUES ('r','r'),('c','c'); CREATE VIEW v3 AS SELECT * FROM t2; SELECT DISTINCT alias2.col_varchar_key FROM t1 AS alias1 JOIN v3 AS alias2 ON alias2.col_varchar_key = alias1.col_varchar_key HAVING col_varchar_key IN (SELECT col_varchar_nokey FROM t2) ; col_varchar_key r DROP TABLE t1, t2; DROP VIEW v3; # End Bug#11852644 # Bug#12668294 - GROUP BY ON EMPTY RESULT GIVES EMPTY ROW # INSTEAD OF NULL WHEN MATERIALIZATION ON CREATE TABLE t1 (col_int_nokey INT) ENGINE=MEMORY; CREATE TABLE t2 (col_int_nokey INT) ENGINE=MEMORY; INSERT INTO t2 VALUES (8),(7); CREATE TABLE t3 (col_int_nokey INT) ENGINE=MEMORY; INSERT INTO t3 VALUES (7); SELECT MIN(t3.col_int_nokey),t1.col_int_nokey AS field3 FROM t3 LEFT JOIN t1 ON t1.col_int_nokey WHERE (194, 200) IN ( SELECT SQ4_alias1.col_int_nokey, SQ4_alias2.col_int_nokey FROM t2 AS SQ4_alias1 JOIN t2 AS SQ4_alias2 ON SQ4_alias2.col_int_nokey = 5 ) GROUP BY field3 ; MIN(t3.col_int_nokey) field3 DROP TABLE t1; DROP TABLE t2; DROP TABLE t3; # # Bug#13419028 - SUBQUERY MATERIALIZATION NOT USED IN CREATE # SELECT # CREATE TABLE t1(a int); INSERT INTO t1 values(1),(2); CREATE TABLE t2(a int); INSERT INTO t2 values(1),(2); EXPLAIN SELECT * FROM t1 WHERE a IN (SELECT * FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) FLUSH STATUS; SELECT * FROM t1 WHERE a IN (SELECT * FROM t2); a 1 2 CREATE TABLE t3 SELECT * FROM t1 WHERE a IN (SELECT * FROM t2); SELECT * FROM t3; a 1 2 SHOW STATUS LIKE "CREATED_TMP_TABLES"; Variable_name Value Created_tmp_tables 0 DROP TABLE t1,t2,t3; # # Bug#13552968: Extra row with materialization on join + subquery in # CREATE TABLE t1 ( col_varchar_nokey varchar(1) NOT NULL ) ENGINE=MyISAM; INSERT INTO t1 VALUES ('b'); CREATE TABLE t2 ( col_varchar_nokey varchar(1) NOT NULL ) ENGINE=MyISAM; INSERT INTO t2 VALUES ('k'); CREATE TABLE t3 ( col_varchar_nokey varchar(1) NOT NULL ) ENGINE=MyISAM; explain SELECT STRAIGHT_JOIN * FROM t1 LEFT JOIN t2 ON t1.col_varchar_nokey IN (SELECT col_varchar_nokey FROM t3); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 NULL 1 PRIMARY t2 system NULL NULL NULL NULL 1 NULL 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table SELECT STRAIGHT_JOIN * FROM t1 LEFT JOIN t2 ON t1.col_varchar_nokey IN (SELECT col_varchar_nokey FROM t3); col_varchar_nokey col_varchar_nokey b NULL DROP TABLE t1, t2, t3; # End of test for bug#13552968 # # Bug#13591383: Assertion !(*tab->on_expr_ref && .. && is_expensive()) # in join_read_const_table() # CREATE TABLE t1 (v INTEGER) ENGINE=MyISAM; INSERT INTO t1 VALUES(1); CREATE TABLE t2 (v INTEGER) ENGINE=MyISAM; SELECT * FROM t1 LEFT JOIN t2 ON t2.v IN(SELECT v FROM t1); v v 1 NULL DROP TABLE t1, t2; # End of test for bug#13591383. # # Bug#13607423: Assertion !(*tab->on_expr_ref->is_expensive()) # in join_read_const_table() # CREATE TABLE t1 ( pk int NOT NULL, col_int_nokey int DEFAULT NULL, col_int_key int DEFAULT NULL, PRIMARY KEY (pk), KEY col_int_key (col_int_key) ) ENGINE=MyISAM; INSERT INTO t1 VALUES (1,2,4), (2,150,62); CREATE TABLE t2 ( pk int NOT NULL, col_int_key int DEFAULT NULL, PRIMARY KEY (pk) ) ENGINE=MyISAM; INSERT INTO t2 VALUES (1,7); explain SELECT table1.pk, table2.pk FROM t2 AS table1 LEFT JOIN t2 AS table2 ON table2.pk = table1.pk AND table2.col_int_key IN (SELECT col_int_key FROM t1 AS innr WHERE innr.col_int_nokey > innr.col_int_nokey GROUP BY col_int_key HAVING COUNT(*) > 0 ); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY table1 system NULL NULL NULL NULL 1 NULL 1 PRIMARY table2 system PRIMARY NULL NULL NULL 1 NULL 2 DEPENDENT SUBQUERY innr ALL col_int_key NULL NULL NULL 2 Using where; Using temporary; Using filesort FLUSH STATUS; SELECT table1.pk, table2.pk FROM t2 AS table1 LEFT JOIN t2 AS table2 ON table2.pk = table1.pk AND table2.col_int_key IN (SELECT col_int_key FROM t1 AS innr WHERE innr.col_int_nokey > innr.col_int_nokey GROUP BY col_int_key HAVING COUNT(*) > 0 ); pk pk 1 NULL SHOW SESSION STATUS LIKE 'Sort_scan%'; Variable_name Value Sort_scan 1 DROP TABLE t1, t2; # End of test for bug#13607423. Test of WL#6094 "Allow subquery materialization in NOT IN if all columns are not nullable" create table t1(a int not null); create table t2(a int not null); insert into t1 values(1),(2); insert into t2 values(1),(2); Test in SELECT list cols not nullable => subq materialization explain extended select a, (a,a) in (select a,a from t2) from t1; 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 NULL 2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,<in_optimizer>((`test`.`t1`.`a`,`test`.`t1`.`a`),(`test`.`t1`.`a`,`test`.`t1`.`a`) in ( <materialize> (/* select#2 */ select `test`.`t2`.`a`,`test`.`t2`.`a` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on <auto_key> where ((`test`.`t1`.`a` = `materialized-subquery`.`a`) and (`test`.`t1`.`a` = `materialized-subquery`.`a`))))) AS `(a,a) in (select a,a from t2)` from `test`.`t1` select a, (a,a) in (select a,a from t2) from t1; a (a,a) in (select a,a from t2) 1 1 2 1 cols not nullable => subq materialization explain extended select t1.a, t2.a, (t1.a,t1.a) in (select a,a from t2 as t3) from t1 join t2 on t1.a+t2.a=1000; 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 NULL 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (Block Nested Loop) 2 SUBQUERY t3 ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,<in_optimizer>((`test`.`t1`.`a`,`test`.`t1`.`a`),(`test`.`t1`.`a`,`test`.`t1`.`a`) in ( <materialize> (/* select#2 */ select `test`.`t3`.`a`,`test`.`t3`.`a` from `test`.`t2` `t3` where 1 having 1 ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on <auto_key> where ((`test`.`t1`.`a` = `materialized-subquery`.`a`) and (`test`.`t1`.`a` = `materialized-subquery`.`a`))))) AS `(t1.a,t1.a) in (select a,a from t2 as t3)` from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`a` + `test`.`t2`.`a`) = 1000) select t1.a, t2.a, (t1.a,t1.a) in (select a,a from t2 as t3) from t1 join t2 on t1.a+t2.a=1000; a a (t1.a,t1.a) in (select a,a from t2 as t3) t2.a is not nullable, but in the query it may appear as NULL as it's in an outer join. So, no materialization. explain extended select t1.a, t2.a, (t2.a,t2.a) in (select a,a from t2 as t3) from t1 left join t2 on t1.a+t2.a=1000; 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 NULL 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (Block Nested Loop) 2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 2 100.00 Using where Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`a`),<exists>(/* select#2 */ select 1,1 from `test`.`t2` `t3` where (<if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`a`) = `test`.`t3`.`a`) or <cache>(isnull(`test`.`t3`.`a`))), true) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`a`) = `test`.`t3`.`a`) or <cache>(isnull(`test`.`t3`.`a`))), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t3`.`a`), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t3`.`a`), true)))) AS `(t2.a,t2.a) in (select a,a from t2 as t3)` from `test`.`t1` left join `test`.`t2` on(((`test`.`t1`.`a` + `test`.`t2`.`a`) = 1000)) where 1 select t1.a, t2.a, (t2.a,t2.a) in (select a,a from t2 as t3) from t1 left join t2 on t1.a+t2.a=1000; a a (t2.a,t2.a) in (select a,a from t2 as t3) 1 NULL NULL 2 NULL NULL alter table t2 modify a int; two nullable inner cols => no subq materialization explain extended select t1.a, t2.a, (t1.a,t1.a) in (select a,a from t2 as t3) from t1 join t2 on t1.a+t2.a=1000; 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 NULL 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (Block Nested Loop) 2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 2 100.00 Using where Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,<in_optimizer>((`test`.`t1`.`a`,`test`.`t1`.`a`),<exists>(/* select#2 */ select 1,1 from `test`.`t2` `t3` where (((<cache>(`test`.`t1`.`a`) = `test`.`t3`.`a`) or isnull(`test`.`t3`.`a`)) and ((<cache>(`test`.`t1`.`a`) = `test`.`t3`.`a`) or isnull(`test`.`t3`.`a`))) having (<is_not_null_test>(`test`.`t3`.`a`) and <is_not_null_test>(`test`.`t3`.`a`)))) AS `(t1.a,t1.a) in (select a,a from t2 as t3)` from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`a` + `test`.`t2`.`a`) = 1000) select t1.a, t2.a, (t1.a,t1.a) in (select a,a from t2 as t3) from t1 join t2 on t1.a+t2.a=1000; a a (t1.a,t1.a) in (select a,a from t2 as t3) alter table t2 modify a int not null; Test in WHERE top-level => subq materialization. With one exception: if semijoin is enabled in @@optimizer_switch, semijoin is chosen, then rejected (due to outer join), and in that case, the fallback is IN->EXISTS, subq-materialization is not tried... explain extended select t1.a, t2.a from t1 join t2 on t1.a+t2.a=3 where (t2.a,t2.a) in (select a,a from t2 as t3); id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; FirstMatch(t2); Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2` `t3`) join `test`.`t2` where ((`test`.`t3`.`a` = `test`.`t2`.`a`) and ((`test`.`t1`.`a` + `test`.`t2`.`a`) = 3)) select t1.a, t2.a from t1 join t2 on t1.a+t2.a=3 where (t2.a,t2.a) in (select a,a from t2 as t3); a a 2 1 1 2 cols not nullable => subq materialization explain extended select t1.a, t2.a from t1 join t2 on t1.a+t2.a=3 where (t2.a,t2.a) not in (select a,a from t2 as t3); 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 NULL 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (Block Nested Loop) 2 SUBQUERY t3 ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a` from `test`.`t1` join `test`.`t2` where ((not(<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`a`),(`test`.`t2`.`a`,`test`.`t2`.`a`) in ( <materialize> (/* select#2 */ select `test`.`t3`.`a`,`test`.`t3`.`a` from `test`.`t2` `t3` where 1 having 1 ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on <auto_key> where ((`test`.`t2`.`a` = `materialized-subquery`.`a`) and (`test`.`t2`.`a` = `materialized-subquery`.`a`))))))) and ((`test`.`t1`.`a` + `test`.`t2`.`a`) = 3)) select t1.a, t2.a from t1 join t2 on t1.a+t2.a=3 where (t2.a,t2.a) not in (select a,a from t2 as t3); a a drop table t1,t2; Test of WL6095 "Allow subquery materialization in NOT IN if single-column subquery" create table t1(a int null); create table t2(a int null); insert into t1 values(1),(2); insert into t2 values(1),(2); one col => subq materialization explain extended select a, a in (select a from t2) from t1; 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 NULL 2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,<in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on <auto_key> where ((`test`.`t1`.`a` = `materialized-subquery`.`a`))))) AS `a in (select a from t2)` from `test`.`t1` select a, a in (select a from t2) from t1; a a in (select a from t2) 1 1 2 1 t2.a is not nullable, but in the query it may appear as NULL as it's in an outer join. But there is only one inner column so materialization is possible explain extended select t1.a, t2.a, t2.a in (select * from t2 as t3) from t1 left join t2 on t1.a+t2.a=1000; 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 NULL 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (Block Nested Loop) 2 SUBQUERY t3 ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,<in_optimizer>(`test`.`t2`.`a`,`test`.`t2`.`a` in ( <materialize> (/* select#2 */ select `test`.`t3`.`a` from `test`.`t2` `t3` where 1 having 1 ), <primary_index_lookup>(`test`.`t2`.`a` in <temporary table> on <auto_key> where ((`test`.`t2`.`a` = `materialized-subquery`.`a`))))) AS `t2.a in (select * from t2 as t3)` from `test`.`t1` left join `test`.`t2` on(((`test`.`t1`.`a` + `test`.`t2`.`a`) = 1000)) where 1 select t1.a, t2.a, t2.a in (select * from t2 as t3) from t1 left join t2 on t1.a+t2.a=1000; a a t2.a in (select * from t2 as t3) 1 NULL NULL 2 NULL NULL _two_ outer columns, nullable => no materialization explain extended select t1.a, t2.a, (t2.a,t2.a) in (select a,a from t2 as t3) from t1 left join t2 on t1.a+t2.a=1000; 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 NULL 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (Block Nested Loop) 2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 2 100.00 Using where Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,<in_optimizer>((`test`.`t2`.`a`,`test`.`t2`.`a`),<exists>(/* select#2 */ select 1,1 from `test`.`t2` `t3` where (<if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`a`) = `test`.`t3`.`a`) or isnull(`test`.`t3`.`a`)), true) and <if>(outer_field_is_not_null, ((<cache>(`test`.`t2`.`a`) = `test`.`t3`.`a`) or isnull(`test`.`t3`.`a`)), true)) having (<if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t3`.`a`), true) and <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t3`.`a`), true)))) AS `(t2.a,t2.a) in (select a,a from t2 as t3)` from `test`.`t1` left join `test`.`t2` on(((`test`.`t1`.`a` + `test`.`t2`.`a`) = 1000)) where 1 select t1.a, t2.a, (t2.a,t2.a) in (select a,a from t2 as t3) from t1 left join t2 on t1.a+t2.a=1000; a a (t2.a,t2.a) in (select a,a from t2 as t3) 1 NULL NULL 2 NULL NULL drop table t1,t2; Test in HAVING create table t1(a int, b int); create table t2(a int); insert into t1 values(1,1),(1,2),(1,3),(2,1),(2,2),(2,3); insert into t2 values(10),(20); no NULLs. explain extended select t1.a as z, sum(t1.b) from t1 group by t1.a having (z in (select * from t2)) is null; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort 2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `z`,sum(`test`.`t1`.`b`) AS `sum(t1.b)` from `test`.`t1` group by `test`.`t1`.`a` having isnull(<in_optimizer>(`z`,`z` in ( <materialize> (/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`z` in <temporary table> on <auto_key> where ((`z` = `materialized-subquery`.`a`)))))) select t1.a as z, sum(t1.b) from t1 group by t1.a having (z in (select * from t2)) is null; z sum(t1.b) one outer NULL insert into t1 values(null,null); explain extended select t1.a as z, sum(t1.b) from t1 group by t1.a having (z in (select * from t2)) is null; 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 Using temporary; Using filesort 2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `z`,sum(`test`.`t1`.`b`) AS `sum(t1.b)` from `test`.`t1` group by `test`.`t1`.`a` having isnull(<in_optimizer>(`z`,`z` in ( <materialize> (/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`z` in <temporary table> on <auto_key> where ((`z` = `materialized-subquery`.`a`)))))) select t1.a as z, sum(t1.b) from t1 group by t1.a having (z in (select * from t2)) is null; z sum(t1.b) NULL NULL one outer NULL and one inner NULL insert into t2 values(null); explain extended select t1.a as z, sum(t1.b) from t1 group by t1.a having (z in (select * from t2)) is null; 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 Using temporary; Using filesort 2 SUBQUERY t2 ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `z`,sum(`test`.`t1`.`b`) AS `sum(t1.b)` from `test`.`t1` group by `test`.`t1`.`a` having isnull(<in_optimizer>(`z`,`z` in ( <materialize> (/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`z` in <temporary table> on <auto_key> where ((`z` = `materialized-subquery`.`a`)))))) select t1.a as z, sum(t1.b) from t1 group by t1.a having (z in (select * from t2)) is null; z sum(t1.b) NULL NULL 1 6 2 6 one inner NULL delete from t1 where a is null; explain extended select t1.a as z, sum(t1.b) from t1 group by t1.a having (z in (select * from t2)) is null; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00 Using temporary; Using filesort 2 SUBQUERY t2 ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `z`,sum(`test`.`t1`.`b`) AS `sum(t1.b)` from `test`.`t1` group by `test`.`t1`.`a` having isnull(<in_optimizer>(`z`,`z` in ( <materialize> (/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`z` in <temporary table> on <auto_key> where ((`z` = `materialized-subquery`.`a`)))))) select t1.a as z, sum(t1.b) from t1 group by t1.a having (z in (select * from t2)) is null; z sum(t1.b) 1 6 2 6 drop table t1,t2; Verify that an inner NULL is looked up only once (result is cached). create table t1(a int); create table t2(a int); insert into t1 values(1),(2),(3),(4),(5),(6); insert into t1 select * from t1; insert into t2 values(10),(20),(NULL); explain extended select a, (a in (select * from t2)) from t1; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 12 100.00 NULL 2 SUBQUERY t2 ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,<in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` where 1 having 1 ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on <auto_key> where ((`test`.`t1`.`a` = `materialized-subquery`.`a`))))) AS `(a in (select * from t2))` from `test`.`t1` flush status; select a, (a in (select * from t2)) from t1; a (a in (select * from t2)) 1 NULL 2 NULL 3 NULL 4 NULL 5 NULL 6 NULL 1 NULL 2 NULL 3 NULL 4 NULL 5 NULL 6 NULL There will be one look-up in the temporary table for each row of t1 (12), plus one additional look-up to check whether table contains a NULL value. show status like "handler_read_key"; Variable_name Value Handler_read_key 13 drop table t1,t2; # # Bug#13495157 - SUBQUERY MATERIALIZATION NOT USED FOR CERTAIN # STATEMENTS # CREATE TABLE t1(a INT); INSERT INTO t1 VALUES(1),(2),(3); CREATE TABLE t2(a INT); INSERT INTO t2 VALUES(1),(2),(4); # subquery materialization used for SELECT: EXPLAIN SELECT * FROM t1 WHERE a IN (SELECT * FROM t2 WHERE a <> 2); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) SELECT * FROM t1 WHERE a IN (SELECT * FROM t2 WHERE a <> 2); a 1 # Also used for INSERT SELECT: CREATE TABLE t3 SELECT * FROM t1; EXPLAIN INSERT INTO t3 SELECT * FROM t1 WHERE a IN (SELECT * FROM t2 WHERE a <> 2); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where 1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) INSERT INTO t3 SELECT * FROM t1 WHERE a IN (SELECT * FROM t2 WHERE a <> 2); SELECT * FROM t3; a 1 1 2 3 EXPLAIN INSERT INTO t2 SELECT * FROM t1 WHERE a IN (SELECT * FROM t2 WHERE a <> 2); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where; Using temporary 1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) INSERT INTO t2 SELECT * FROM t1 WHERE a IN (SELECT * FROM t2 WHERE a <> 2); SELECT * FROM t2; a 1 1 2 4 EXPLAIN INSERT INTO t2 SELECT * FROM t2 WHERE a IN (SELECT * FROM t2 WHERE a <> 2); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ALL NULL NULL NULL NULL 4 Using where; Using temporary 1 SIMPLE t2 ALL NULL NULL NULL NULL 4 Using where; FirstMatch(t2); Using join buffer (Block Nested Loop) INSERT INTO t2 SELECT * FROM t2 WHERE a IN (SELECT * FROM t2 WHERE a <> 2); SELECT * FROM t2; a 1 1 1 1 2 4 4 # Not used for single-table UPDATE, DELETE: EXPLAIN SELECT * FROM t2 WHERE a IN (SELECT * FROM t1); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 7 Using where; Using join buffer (Block Nested Loop) 2 MATERIALIZED t1 ALL NULL NULL NULL NULL 3 NULL EXPLAIN UPDATE t2 SET a=a-1 WHERE a IN (SELECT * FROM t1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 7 Using where 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 Using where UPDATE t2 SET a=a-1 WHERE a IN (SELECT * FROM t1); SELECT * FROM t2; a 0 0 0 0 1 4 4 EXPLAIN DELETE FROM t2 WHERE a IN (SELECT * FROM t1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 7 Using where 2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 Using where DELETE FROM t2 WHERE a IN (SELECT * FROM t1); SELECT * FROM t2; a 0 0 0 0 4 4 EXPLAIN UPDATE t2 SET a=a-1 WHERE a IN (SELECT * FROM t2); ERROR HY000: You can't specify target table 't2' for update in FROM clause EXPLAIN DELETE FROM t2 WHERE a IN (SELECT * FROM t2); ERROR HY000: You can't specify target table 't2' for update in FROM clause UPDATE t2 SET a=3 WHERE a=0; # Used for multi-table UPDATE, DELETE: EXPLAIN SELECT * FROM t2,t3 WHERE t2.a IN (SELECT * FROM t1 WHERE a <> 2); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 ALL NULL NULL NULL NULL 4 Using join buffer (Block Nested Loop) 2 MATERIALIZED t1 ALL NULL NULL NULL NULL 3 Using where EXPLAIN UPDATE t2,t3 SET t2.a=t2.a-2 WHERE t2.a IN (SELECT * FROM t1 WHERE a <> 2); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 ALL NULL NULL NULL NULL 4 Using join buffer (Block Nested Loop) 2 MATERIALIZED t1 ALL NULL NULL NULL NULL 3 Using where UPDATE t2,t3 SET t2.a=t2.a-2 WHERE t2.a IN (SELECT * FROM t1 WHERE a <> 2); SELECT * FROM t2; a 1 1 1 1 4 4 EXPLAIN DELETE t2.* FROM t2,t3 WHERE t2.a IN (SELECT * FROM t1 WHERE a <> 2); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t3 ALL NULL NULL NULL NULL 4 Using join buffer (Block Nested Loop) 2 MATERIALIZED t1 ALL NULL NULL NULL NULL 3 Using where DELETE t2.* FROM t2,t3 WHERE t2.a IN (SELECT * FROM t1 WHERE a <> 2); SELECT * FROM t2; a 4 4 EXPLAIN UPDATE t2,t3 SET t2.a=10 WHERE t2.a IN (SELECT * FROM t2 WHERE a <> 2); ERROR HY000: You can't specify target table 't2' for update in FROM clause EXPLAIN DELETE t2.* FROM t2,t3 WHERE t2.a IN (SELECT * FROM t2 WHERE a <> 2); ERROR HY000: You can't specify target table 't2' for update in FROM clause DROP TABLE t1,t2,t3; # # Test that subquery materialization only does one lookup: does # not try to read the next row if the first row failed the # subquery's WHERE. We use a case where index lookup is not # enough to satisfy IN(), because index has length two when the # outer value has length three, and thus the post-filtering # WHERE added by subselect_hash_sj_engine::setup() makes the # decision. # create table t1 (a varchar(3)); create table t2 (a varchar(2)); insert into t1 values('aaa'), ('aaa'); insert into t2 values('aa'), ('aa'); explain select * from t1 where a in (select a from t2); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 NULL 1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) flush status; select * from t1 where a in (select a from t2); a show status like "handler_read%"; Variable_name Value Handler_read_first 0 Handler_read_key 0 Handler_read_last 0 Handler_read_next 0 Handler_read_prev 0 Handler_read_rnd 0 Handler_read_rnd_next 6 drop table t1,t2; # # Bug#13655791 DIFFERENT RESULT WITH WL6094 ON QUERY WITH XOR # IN WHERE CLAUSE + MYISAM # CREATE TABLE t1 ( pk int NOT NULL, col_varchar_nokey varchar(1) DEFAULT NULL, PRIMARY KEY (pk) ); INSERT INTO t1 VALUES (10,'x'); CREATE TABLE t2 ( pk int NOT NULL, col_varchar_nokey varchar(1) DEFAULT NULL, PRIMARY KEY (pk) ); INSERT INTO t2 VALUES (1,'v'), (5,'x'), (11,'z'), (12,'c'), (15,'y'); CREATE TABLE t3 ( pk int NOT NULL, col_int_key int DEFAULT NULL, PRIMARY KEY (pk), KEY col_int_key (col_int_key) ); INSERT INTO t3 VALUES (10,8); CREATE TABLE t4 ( pk int NOT NULL, col_varchar_nokey varchar(1) DEFAULT NULL, PRIMARY KEY (pk) ); INSERT INTO t4 VALUES (1,'x'); EXPLAIN SELECT OUTR.pk, OUTR.col_varchar_nokey, OUTR2.col_varchar_nokey FROM t2 AS OUTR2 JOIN t4 AS OUTR ON (OUTR2.col_varchar_nokey > OUTR.col_varchar_nokey) WHERE OUTR.col_varchar_nokey IN ( SELECT INNR.col_varchar_nokey FROM t3 AS INNR2 LEFT JOIN t1 AS INNR ON (INNR2.col_int_key >= INNR.pk) ) XOR OUTR.pk < 6 ; 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 2 DEPENDENT SUBQUERY INNR2 system NULL NULL NULL NULL 1 NULL 2 DEPENDENT SUBQUERY INNR system PRIMARY NULL NULL NULL 1 NULL FLUSH STATUS; SELECT OUTR.pk, OUTR.col_varchar_nokey, OUTR2.col_varchar_nokey FROM t2 AS OUTR2 JOIN t4 AS OUTR ON (OUTR2.col_varchar_nokey > OUTR.col_varchar_nokey) WHERE OUTR.col_varchar_nokey IN ( SELECT INNR.col_varchar_nokey FROM t3 AS INNR2 LEFT JOIN t1 AS INNR ON (INNR2.col_int_key >= INNR.pk) ) XOR OUTR.pk < 6 ; pk col_varchar_nokey col_varchar_nokey SHOW STATUS LIKE "HANDLER_READ%"; Variable_name Value Handler_read_first 3 Handler_read_key 0 Handler_read_last 0 Handler_read_next 0 Handler_read_prev 0 Handler_read_rnd 0 Handler_read_rnd_next 3 DROP TABLE t1,t2,t3,t4; # # Bug#13727407: Assert !item->const_item() || !item->not_null_tables() # CREATE TABLE t1 ( col_int_key INT, KEY col_int_key (col_int_key) ); INSERT INTO t1 VALUES (1); CREATE TABLE t2 ( col_int_key INT, col_time_key TIME, col_datetime_nokey DATETIME, KEY col_int_key (col_int_key), KEY col_time_key (col_time_key) ); INSERT INTO t2 VALUES (7,'14:03:03','2001-11-28 00:50:27'), (1,'01:46:09','2007-10-09 19:53:04'); EXPLAIN SELECT col_datetime_nokey AS x FROM t2 AS outr WHERE col_int_key IN ( SELECT STRAIGHT_JOIN col_int_key FROM t1 ) AND outr.col_int_key = 0 HAVING x = '2000-09-09' ORDER BY col_time_key; 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 2 DEPENDENT SUBQUERY t1 system col_int_key NULL NULL NULL 1 NULL SELECT col_datetime_nokey AS x FROM t2 AS outr WHERE col_int_key IN ( SELECT STRAIGHT_JOIN col_int_key FROM t1 ) AND outr.col_int_key = 0 HAVING x = '2000-09-09' ORDER BY col_time_key; x DROP TABLE t1, t2; # # Bug#13838501 ASSERTION `TABLE->FILE->INITED' FAILED IN # SUBSELECT_HASH_SJ_ENGINE::EXEC # CREATE TABLE t1 (c1 bigint,c2 char,pk INT,c3 char,c4 int,c5 INT,key (c5)) ENGINE=InnoDB; INSERT INTO t1 VALUES (763078661862588416,0,1,'',1,''); Warnings: Warning 1366 Incorrect integer value: '' for column 'c5' at row 1 CREATE TABLE t2 (c4k int,c4 int,cminnuk INT,key (cminnuk)) ENGINE=InnoDB; INSERT INTO t2 VALUES(0,'',''); Warnings: Warning 1366 Incorrect integer value: '' for column 'c4' at row 1 Warning 1366 Incorrect integer value: '' for column 'cminnuk' at row 1 CREATE TABLE t3 (c4 int,pk INT,c1 bigint,cyk year,cy year,key (cyk)) ENGINE=InnoDB; INSERT INTO t3 VALUES(0,8,'',0,''); Warnings: Warning 1366 Incorrect integer value: '' for column 'c1' at row 1 Warning 1366 Incorrect integer value: '' for column 'cy' at row 1 EXPLAIN SELECT o.c2 AS x FROM t1 AS o WHERE o.c1 IN (SELECT innr.c4 AS y FROM t2 AS innr2 JOIN t3 AS innr ON (innr2.c4k=innr.c4) WHERE innr.c1=6 OR NOT innr.c1=innr.pk ORDER BY innr.c4) AND o.c4=7 XOR o.pk=3 ORDER BY o.pk; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY o ALL NULL NULL NULL NULL 1 Using where; Using filesort 2 SUBQUERY innr2 ALL NULL NULL NULL NULL 1 NULL 2 SUBQUERY innr ALL NULL NULL NULL NULL 1 Using where; Using join buffer (Block Nested Loop) SELECT o.c2 AS x FROM t1 AS o WHERE o.c1 IN (SELECT innr.c4 AS y FROM t2 AS innr2 JOIN t3 AS innr ON (innr2.c4k=innr.c4) WHERE innr.c1=6 OR NOT innr.c1=innr.pk ORDER BY innr.c4) AND o.c4=7 XOR o.pk=3 ORDER BY o.pk; x DROP TABLE t1,t2,t3; # # Bug#19297190 NOT IN DOESN'T RETURN EXPECTED RESULT # CREATE TABLE t1 (a VARCHAR(500) CHARACTER SET UTF8) ENGINE=INNODB; SET @str= repeat("a",450); SET @num=1000; INSERT INTO t1 VALUES (CONCAT((@num:=@num+1), @str)); INSERT INTO t1 SELECT CONCAT((@num:=@num+1), @str) FROM t1; INSERT INTO t1 SELECT CONCAT((@num:=@num+1), @str) FROM t1; INSERT INTO t1 SELECT CONCAT((@num:=@num+1), @str) FROM t1; INSERT INTO t1 SELECT CONCAT((@num:=@num+1), @str) FROM t1; INSERT INTO t1 SELECT CONCAT((@num:=@num+1), @str) FROM t1; SELECT COUNT(*) FROM t1; COUNT(*) 32 ANALYZE TABLE t1; Table Op Msg_type Msg_text test.t1 analyze status OK set @save_heap_size= @@max_heap_table_size; set @@max_heap_table_size= 16384; EXPLAIN SELECT COUNT(*) FROM t1 WHERE t1.a NOT IN ( SELECT t2.a FROM t1 as t2 ); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 32 Using where 2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 32 Using where SELECT COUNT(*) FROM t1 WHERE t1.a NOT IN ( SELECT t2.a FROM t1 as t2 ); COUNT(*) 0 ALTER TABLE t1 MODIFY a VARCHAR(332) CHARACTER SET UTF8; ANALYZE TABLE t1; Table Op Msg_type Msg_text test.t1 analyze status OK EXPLAIN SELECT COUNT(*) FROM t1 WHERE t1.a NOT IN ( SELECT t2.a FROM t1 as t2 ); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 32 Using where 2 SUBQUERY t2 ALL NULL NULL NULL NULL 32 NULL SELECT COUNT(*) FROM t1 WHERE t1.a NOT IN ( SELECT t2.a FROM t1 as t2 ); COUNT(*) 0 DROP TABLE t1; set @@max_heap_table_size= @save_heap_size; # End of 5.6 tests set @@optimizer_switch=@old_opt_switch; set optimizer_switch=default;