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Merge spetrunia@bk-internal.mysql.com:/home/bk/mysql-5.0-opt

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into  mysql.com:/home/psergey/mysql-5.0-bug29740
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sergefp@pylon64.mylan
2007-07-14 20:31:59 +04:00
parent d40c4aaa67 8bba908915
commit a452cbff79
4 changed files with 118 additions and 19 deletions
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61
mysql-test/r/index_merge.result
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@@ -455,3 +455,64 @@ a
1
UNLOCK TABLES;
DROP TABLE t1, t2;
CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`filler` char(200) DEFAULT NULL,
`b` int(11) DEFAULT NULL,
KEY `a` (`a`),
KEY `b` (`b`)
) ENGINE=MEMORY DEFAULT CHARSET=latin1;
insert into t1 values
(0, 'filler', 0), (1, 'filler', 1), (2, 'filler', 2), (3, 'filler', 3),
(4, 'filler', 4), (5, 'filler', 5), (6, 'filler', 6), (7, 'filler', 7),
(8, 'filler', 8), (9, 'filler', 9), (0, 'filler', 0), (1, 'filler', 1),
(2, 'filler', 2), (3, 'filler', 3), (4, 'filler', 4), (5, 'filler', 5),
(6, 'filler', 6), (7, 'filler', 7), (8, 'filler', 8), (9, 'filler', 9),
(10, 'filler', 10), (11, 'filler', 11), (12, 'filler', 12), (13, 'filler', 13),
(14, 'filler', 14), (15, 'filler', 15), (16, 'filler', 16), (17, 'filler', 17),
(18, 'filler', 18), (19, 'filler', 19), (4, '5 ', 0), (5, '4 ', 0),
(4, '4 ', 0), (4, 'qq ', 5), (5, 'qq ', 4), (4, 'zz ', 4);
create table t2(
`a` int(11) DEFAULT NULL,
`filler` char(200) DEFAULT NULL,
`b` int(11) DEFAULT NULL,
KEY USING BTREE (`a`),
KEY USING BTREE (`b`)
) ENGINE=MEMORY DEFAULT CHARSET=latin1;
insert into t2 select * from t1;
must use sort-union rather than union:
explain select * from t1 where a=4 or b=4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 4 Using sort_union(a,b); Using where
select * from t1 where a=4 or b=4;
a filler b
4 zz 4
5 qq 4
4 filler 4
4 qq 5
4 4 0
4 filler 4
4 5 0
select * from t1 ignore index(a,b) where a=4 or b=4;
a filler b
4 filler 4
4 filler 4
4 5 0
4 4 0
4 qq 5
5 qq 4
4 zz 4
must use union, not sort-union:
explain select * from t2 where a=4 or b=4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index_merge a,b a,b 5,5 NULL 7 Using union(a,b); Using where
select * from t2 where a=4 or b=4;
a filler b
4 5 0
4 zz 4
5 qq 4
4 filler 4
4 qq 5
4 4 0
4 filler 4
drop table t1, t2;