Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Won't Fix
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5.1.73, 5.2.15, 5.3.13
Description
Test case:
CREATE TABLE t1 (a INT) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (3),(6);
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CREATE TABLE t2 (b INT) ENGINE=MyISAM;
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INSERT INTO t2 VALUES (8),(9);
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SELECT * FROM t1 LEFT JOIN t2 ON ( a = b ) HAVING a NOT IN ( SELECT 6 ) ORDER BY a ;
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DROP TABLE t1, t2;
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On current MariaDB 5.1, 5.2, 5.3, MySQL 5.1, 5.5 it returns the wrong result (empty set):
a b
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On current MariaDB 5.5, 10.0, MySQL 5.6, 57 it returns the expected result (1 row):
a b
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3 NULL
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Story:
The bug was introduced in MySQL 5.1 (and merged up) by the following revision:
revno: 4005
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revision-id: sergey.glukhov@oracle.com-20130507091058-x4li5jat6pvhop96
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parent: annamalai.gurusami@oracle.com-20130506105856-d5il8vpqcovru47g
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committer: Sergey Glukhov <sergey.glukhov@oracle.com>
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branch nick: mysql-5.1
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timestamp: Tue 2013-05-07 13:10:58 +0400
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message:
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Bug#16095534 CRASH: PREPARED STATEMENT CRASHES IN ITEM_BOOL_FUNC2::FIX_LENGTH_AND_DEC
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The problem happened due to broken left expression in Item_in_optimizer object.
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In case of the bug left expression is runtime created Item_outer_ref item which
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is deleted at the end of the statement and one of Item_in_optimizer arguments
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becomes bad when re-executed. The fix is to use real_item() instead of original
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left expression. Note: It feels a bit weird that after preparing, the field is
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directly part of the generated Item_func_eq, whereas in execution it is replaced
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with an Item_outer_ref wrapper object.
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Later the bug was fixed in MySQL 5.6 and up by the following revision:
revno: 5849
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revision-id: chaithra.gopalareddy@oracle.com-20140228093141-v2sgort4nzof1ydg
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parent: georgi.kodinov@oracle.com-20140228084025-kijma5qd98ttna38
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committer: Chaithra Gopalareddy <chaithra.gopalareddy@oracle.com>
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branch nick: mysql-5.6
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timestamp: Fri 2014-02-28 15:01:41 +0530
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message:
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Bug#18014565: WRONG RESULT COMPUTATION USING ALL() AND GROUP BY
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The first change was merged into MySQL 5.5 and made it to MariaDB 5.5; but then the bug was fixed in MariaDB 5.5 by this revision:
revno: 3895
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revision-id: sergii@pisem.net-20130913214200-0b5q0uanbj6mtti7
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parent: bar@mnogosearch.org-20130913104740-3nvxlwt6h9pxatqz
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fixes bug: https://mariadb.atlassian.net/browse/MDEV-5012
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committer: Sergei Golubchik <sergii@pisem.net>
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branch nick: 5.5
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timestamp: Fri 2013-09-13 23:42:00 +0200
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message:
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MDEV-5012 Server crashes in Item_ref::real_item on EXPLAIN with select subqueries or views, constant table, derived_merge+derived_with_keys
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revert incorrect change, merged from mysql-5.5
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So, it's not reproducible on MariaDB 5.5 and 10.0.
Recently, MySQL 5.1 was merged into MariaDB 5.1/5.2/5.3. The faulty change was merged too, so the wrong result started appearing on these trees. But the fix for it only exists in MySQL 5.6 or MariaDB 5.5, so apparently the bug will stay in MySQL 5.1/5.5 forever, and in MariaDB 5.1-5.3 too unless we decide it's worth fixing.
Please decide.