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removing additional IN subquery condition

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fixed IN optimisation bug


mysql-test/r/subselect.result:
  test of IN optimisation bug
mysql-test/t/subselect.test:
  test of IN optimisation bug
sql/item_subselect.cc:
  fixed IN optimisation bug
sql/mysql_priv.h:
  constant for additional IN subquery condition detecting
sql/mysqld.cc:
  constant for additional IN subquery condition detecting
sql/sql_select.cc:
  removing additional IN subquery condition
This commit is contained in:
unknown
2003-09-08 21:58:09 +03:00
parent b036ffec6c
commit d17cfa9caa
6 changed files with 97 additions and 14 deletions
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25
mysql-test/r/subselect.result
View File

@ -829,7 +829,7 @@ a t1.a in (select t2.a from t2)
explain SELECT t1.a, t1.a in (select t2.a from t2) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 Using index
2 DEPENDENT SUBQUERY t2 index_in a a 5 func 2 Using where; Using index
2 DEPENDENT SUBQUERY t2 index_in a a 5 func 2 Using index
CREATE TABLE t3 (a int(11) default '0');
INSERT INTO t3 VALUES (1),(2),(3);
SELECT t1.a, t1.a in (select t2.a from t2,t3 where t3.a=t2.a) FROM t1;
@ -1369,3 +1369,26 @@ select * from t1 where ('a','b')=(select 'a','b' from t1 union select 'a','b' fr
s1
tttt
drop table t1;
create table t1 (s1 char(5), index s1(s1));
create table t2 (s1 char(5), index s1(s1));
insert into t1 values ('a1'),('a2'),('a3');
insert into t2 values ('a1'),('a2');
select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
s1 s1 NOT IN (SELECT s1 FROM t2)
a1 0
a2 0
a3 1
select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
s1 s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2')
a1 0
a2 1
a3 1
explain select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 Using index
2 DEPENDENT SUBQUERY t2 index_in s1 s1 6 func 2 Using index
explain select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL s1 6 NULL 3 Using index
2 DEPENDENT SUBQUERY t2 index_in s1 s1 6 func 1 Using index; Using where
drop table t1,t2;

13
mysql-test/t/subselect.test
View File

@ -932,3 +932,16 @@ select (select 'a','b' from t1 union select 'a','b' from t1) from t1;
insert into t1 values ('tttt');
select * from t1 where ('a','b')=(select 'a','b' from t1 union select 'a','b' from t1);
drop table t1;
#
# IN optimisation test results
#
create table t1 (s1 char(5), index s1(s1));
create table t2 (s1 char(5), index s1(s1));
insert into t1 values ('a1'),('a2'),('a3');
insert into t2 values ('a1'),('a2');
select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
explain select s1, s1 NOT IN (SELECT s1 FROM t2) from t1;
explain select s1, s1 NOT IN (SELECT s1 FROM t2 WHERE s1 < 'a2') from t1;
drop table t1,t2;