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c13144722a
The bug was as follows: When merge_key_fields() encounters "t.key=X OR t.key=Y" it will try to join them into ref_or_null access via "t.key=X OR NULL". In order to make this inference it checks if Y<=>NULL, ignoring the fact that value of Y may be not yet known. The fix is that the check if Y<=>NULL is made only if value of Y is known (i.e. it is a constant). TODO: When merging to 5.0, replace used_tables() with const_item() everywhere in merge_key_fields(). mysql-test/r/innodb_mysql.result: Testcase for BUG16798 mysql-test/t/innodb_mysql.test: Testcase for BUG16798 sql/sql_select.cc: BUG#16798: Inapplicable ref_or_null query plan and bad query result on random occasions In merge_key_fields() don't call val->is_null() if the value of val is not known.
57 lines
1.6 KiB
Plaintext
57 lines
1.6 KiB
Plaintext
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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