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Fix for bug#5088:

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* When executing EXPLAIN, do the same as for the query: convert join type to JT_CONST if keyuse array covers all key parts and all of them are constants.
 * In remove_const, don't remove conditions that depend on some-const-table and current-table.


mysql-test/r/join_outer.result:
  Testcase for bug#5088
mysql-test/t/join_outer.test:
  Testcase for bug#5088
This commit is contained in:
unknown
2004-08-23 12:31:56 +04:00
parent 83e3d3f9a3
commit 34c8e46dc3
3 changed files with 124 additions and 3 deletions
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71
mysql-test/r/join_outer.result
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@ -634,7 +634,7 @@ insert into t2 values (10,1),(20,2),(30,3);
explain select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL PRIMARY 4 NULL 3 Using index
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 2 const 1 Using where; Using index
1 SIMPLE t1 const PRIMARY PRIMARY 2 const 1 Using where; Using index
select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
fooID barID fooID
10 1 NULL
@ -682,3 +682,72 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
1 SIMPLE t3 ALL NULL NULL NULL NULL 2
drop table t1, t2, t3;
create table t1 (
match_id tinyint(3) unsigned not null auto_increment,
home tinyint(3) unsigned default '0',
unique key match_id (match_id),
key match_id_2 (match_id)
);
insert into t1 values("1", "2");
create table t2 (
player_id tinyint(3) unsigned default '0',
match_1_h tinyint(3) unsigned default '0',
key player_id (player_id)
);
insert into t2 values("1", "5");
insert into t2 values("2", "9");
insert into t2 values("3", "3");
insert into t2 values("4", "7");
insert into t2 values("5", "6");
insert into t2 values("6", "8");
insert into t2 values("7", "4");
insert into t2 values("8", "12");
insert into t2 values("9", "11");
insert into t2 values("10", "10");
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
(t2 s left join t1 m on m.match_id = 1)
order by m.match_id desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE s ALL NULL NULL NULL NULL 10
1 SIMPLE m const match_id,match_id_2 match_id 1 const 1 Using where
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
(t2 s left join t1 m on m.match_id = 1)
order by UUX desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE s ALL NULL NULL NULL NULL 10 Using temporary; Using filesort
1 SIMPLE m const match_id,match_id_2 match_id 1 const 1 Using where
select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
(t2 s left join t1 m on m.match_id = 1)
order by UUX desc;
player_id match_1_h * match_id home UUX
8 12 * 1 2 10
9 11 * 1 2 9
10 10 * 1 2 8
2 9 * 1 2 7
6 8 * 1 2 6
4 7 * 1 2 5
5 6 * 1 2 4
1 5 * 1 2 3
7 4 * 1 2 2
3 3 * 1 2 1
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
t2 s straight_join t1 m where m.match_id = 1
order by UUX desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE s ALL NULL NULL NULL NULL 10 Using temporary; Using filesort
1 SIMPLE m const match_id,match_id_2 match_id 1 const 1 Using where
select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
t2 s straight_join t1 m where m.match_id = 1
order by UUX desc;
player_id match_1_h * match_id home UUX
8 12 * 1 2 10
9 11 * 1 2 9
10 10 * 1 2 8
2 9 * 1 2 7
6 8 * 1 2 6
4 7 * 1 2 5
5 6 * 1 2 4
1 5 * 1 2 3
7 4 * 1 2 2
3 3 * 1 2 1
drop table t1, t2;