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5079d5cf6a
* don't use join cache when the incoming data set is already ordered
for ORDER BY
This choice must be made because join cache will effectively
reverse the join order and the results will be sorted by the index
of the table that uses join cache.
85 lines
2.6 KiB
Text
85 lines
2.6 KiB
Text
drop table if exists t1,t2;
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create table t1 (
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c_id int(11) not null default '0',
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org_id int(11) default null,
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unique key contacts$c_id (c_id),
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key contacts$org_id (org_id)
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) engine=innodb;
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insert into t1 values
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(2,null),(120,null),(141,null),(218,7), (128,1),
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(151,2),(234,2),(236,2),(243,2),(255,2),(259,2),(232,3),(235,3),(238,3),
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(246,3),(253,3),(269,3),(285,3),(291,3),(293,3),(131,4),(230,4),(231,4);
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create table t2 (
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slai_id int(11) not null default '0',
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owner_tbl int(11) default null,
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owner_id int(11) default null,
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sla_id int(11) default null,
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inc_web int(11) default null,
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inc_email int(11) default null,
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inc_chat int(11) default null,
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inc_csr int(11) default null,
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inc_total int(11) default null,
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time_billed int(11) default null,
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activedate timestamp null default null,
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expiredate timestamp null default null,
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state int(11) default null,
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sla_set int(11) default null,
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unique key t2$slai_id (slai_id),
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key t2$owner_id (owner_id),
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key t2$sla_id (sla_id)
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) engine=innodb;
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insert into t2(slai_id, owner_tbl, owner_id, sla_id) values
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(1,3,1,1), (3,3,10,2), (4,3,3,6), (5,3,2,5), (6,3,8,3), (7,3,9,7),
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(8,3,6,8), (9,3,4,9), (10,3,5,10), (11,3,11,11), (12,3,7,12);
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flush tables;
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select si.slai_id
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from t1 c join t2 si on
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((si.owner_tbl = 3 and si.owner_id = c.org_id) or
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( si.owner_tbl = 2 and si.owner_id = c.c_id))
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where
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c.c_id = 218 and expiredate is null;
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slai_id
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12
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select * from t1 where org_id is null;
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c_id org_id
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2 NULL
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120 NULL
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141 NULL
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select si.slai_id
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from t1 c join t2 si on
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((si.owner_tbl = 3 and si.owner_id = c.org_id) or
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( si.owner_tbl = 2 and si.owner_id = c.c_id))
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where
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c.c_id = 218 and expiredate is null;
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slai_id
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12
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drop table t1, t2;
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CREATE TABLE t1 (a int, b int, KEY b (b)) Engine=InnoDB;
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CREATE TABLE t2 (a int, b int, PRIMARY KEY (a,b)) Engine=InnoDB;
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CREATE TABLE t3 (a int, b int, c int, PRIMARY KEY (a),
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UNIQUE KEY b (b,c), KEY a (a,b,c)) Engine=InnoDB;
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INSERT INTO t1 VALUES (1, 1);
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INSERT INTO t1 SELECT a + 1, b + 1 FROM t1;
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INSERT INTO t1 SELECT a + 2, b + 2 FROM t1;
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INSERT INTO t2 VALUES (1,1),(1,2),(1,3),(1,4),(1,5),(1,6),(1,7),(1,8);
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INSERT INTO t2 SELECT a + 1, b FROM t2;
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DELETE FROM t2 WHERE a = 1 AND b < 2;
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INSERT INTO t3 VALUES (1,1,1),(2,1,2);
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INSERT INTO t3 SELECT a + 2, a + 2, 3 FROM t3;
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INSERT INTO t3 SELECT a + 4, a + 4, 3 FROM t3;
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SELECT STRAIGHT_JOIN SQL_NO_CACHE t1.b, t1.a FROM t1, t3, t2 WHERE
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t3.a = t2.a AND t2.b = t1.a AND t3.b = 1 AND t3.c IN (1, 2)
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ORDER BY t1.b LIMIT 2;
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b a
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1 1
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2 2
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SELECT STRAIGHT_JOIN SQL_NO_CACHE t1.b, t1.a FROM t1, t3, t2 WHERE
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t3.a = t2.a AND t2.b = t1.a AND t3.b = 1 AND t3.c IN (1, 2)
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ORDER BY t1.b LIMIT 5;
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b a
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1 1
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2 2
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2 2
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3 3
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3 3
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DROP TABLE t1, t2, t3;
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