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1
by brian
clean slate |
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drop table if exists t0, t1, t2, t10, t11, t12;
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create table t0 (a int);
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insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1(a int, b int);
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insert into t1 values (0,0),(1,1),(2,2);
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create table t2 as select * from t1;
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create table t11(a int, b int);
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create table t10 (pk int, a int, primary key(pk));
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insert into t10 select a,a from t0;
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create table t12 like t10;
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insert into t12 select * from t10;
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Flattened because of dependency, t10=func(t1)
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explain select * from t1 where a in (select pk from t10);
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id select_type table type possible_keys key key_len ref rows Extra
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1100.2.1
by Brian Aker
First pass through removing most of the semi_join code. |
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1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
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2 SUBQUERY t10 index NULL PRIMARY 4 NULL 10 Using index
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1
by brian
clean slate |
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select * from t1 where a in (select pk from t10);
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a b
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0 0
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1 1
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2 2
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A confluent case of dependency
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explain select * from t1 where a in (select a from t10 where pk=12);
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id select_type table type possible_keys key key_len ref rows Extra
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1100.2.1
by Brian Aker
First pass through removing most of the semi_join code. |
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1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
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2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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1
by brian
clean slate |
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select * from t1 where a in (select a from t10 where pk=12);
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a b
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An empty table inside
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explain select * from t1 where a in (select a from t11);
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id select_type table type possible_keys key key_len ref rows Extra
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1100.2.1
by Brian Aker
First pass through removing most of the semi_join code. |
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1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
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2 SUBQUERY t11 ALL NULL NULL NULL NULL 1
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1
by brian
clean slate |
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select * from t1 where a in (select a from t11);
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a b
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explain select * from t1 where a in (select pk from t10) and b in (select pk from t10);
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id select_type table type possible_keys key key_len ref rows Extra
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1100.2.1
by Brian Aker
First pass through removing most of the semi_join code. |
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1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
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3 SUBQUERY t10 index NULL PRIMARY 4 NULL 10 Using index
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2 SUBQUERY t10 index NULL PRIMARY 4 NULL 10 Using index
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1
by brian
clean slate |
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select * from t1 where a in (select pk from t10) and b in (select pk from t10);
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a b
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0 0
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1 1
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2 2
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flattening a nested subquery
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explain select * from t1 where a in (select pk from t10 where t10.a in (select pk from t12));
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id select_type table type possible_keys key key_len ref rows Extra
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1100.2.1
by Brian Aker
First pass through removing most of the semi_join code. |
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1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
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2 SUBQUERY t10 ALL NULL NULL NULL NULL 10 Using where
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3 SUBQUERY t12 index NULL PRIMARY 4 NULL 10 Using index
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1
by brian
clean slate |
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select * from t1 where a in (select pk from t10 where t10.a in (select pk from t12));
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a b
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0 0
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1 1
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2 2
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flattening subquery w/ several tables
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explain extended select * from t1 where a in (select t10.pk from t10, t12 where t12.pk=t10.a);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1100.2.1
by Brian Aker
First pass through removing most of the semi_join code. |
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1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
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2 SUBQUERY t10 ALL NULL NULL NULL NULL 10 100.00
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2 SUBQUERY t12 eq_ref PRIMARY PRIMARY 4 test.t10.a 1 100.00 Using index
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1
by brian
clean slate |
63 |
Warnings:
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1100.2.1
by Brian Aker
First pass through removing most of the semi_join code. |
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Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t10`.`pk` AS `pk` from `test`.`t10` join `test`.`t12` where (`test`.`t12`.`pk` = `test`.`t10`.`a`) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key)))
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1
by brian
clean slate |
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subqueries within outer joins go into ON expr.
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814.1.5
by Jay Pipes
Fixes crash in optimizer where LEFT JOIN was mixing with a subselect. |
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select * from
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t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t10))
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where t1.a < 5;
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1100.2.1
by Brian Aker
First pass through removing most of the semi_join code. |
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a b a b
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0 0 0 0
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1 1 1 1
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2 2 2 2
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2141.4.2
by Andrew Hutchings
Implicit joins of the form "SELECT * FROM t1, t2" without WHERE or ON now error. |
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insert into t1 select (A.a + 10 * B.a),1 from t0 A CROSS JOIN t0 B;
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1
by brian
clean slate |
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explain extended select * from t1 where a in (select pk from t10 where pk<3);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 103 100.00 Using where
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1100.2.1
by Brian Aker
First pass through removing most of the semi_join code. |
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2 SUBQUERY t10 range PRIMARY PRIMARY 4 NULL 3 100.00 Using where; Using index
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1
by brian
clean slate |
78 |
Warnings:
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1100.2.1
by Brian Aker
First pass through removing most of the semi_join code. |
79 |
Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,`test`.`t1`.`a` in ( <materialize> (select `test`.`t10`.`pk` AS `pk` from `test`.`t10` where (`test`.`t10`.`pk` < 3) ), <primary_index_lookup>(`test`.`t1`.`a` in <temporary table> on distinct_key)))
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1
by brian
clean slate |
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drop table t0, t1;
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drop table t10, t11, t12;
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1119.4.12
by Stewart Smith
make subselect_sj test not leave tables behind |
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drop table t2;
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