unknown 072073c09e Backport of WL#5953 from MySQL 5.6 ... The patch differs from the original MySQL patch as follows: - All test case differences have been reviewed one by one, and care has been taken to restore the original plan so that each test case executes the code path it was designed for. - A bug was found and fixed in MariaDB 5.3 in Item_allany_subselect::cleanup(). - ORDER BY is not removed because we are unsure of all effects, and it would prevent enabling ORDER BY ... LIMIT subqueries. - ref_pointer_array.m_size is not adjusted because we don't do array bounds checking, and because it looks risky. Original comment by Jorgen Loland: ------------------------------------------------------------- WL#5953 - Optimize away useless subquery clauses For IN/ALL/ANY/SOME/EXISTS subqueries, the following clauses are meaningless: * ORDER BY (since we don't support LIMIT in these subqueries) * DISTINCT * GROUP BY if there is no HAVING clause and no aggregate functions This WL detects and optimizes away these useless parts of the query during JOIN::prepare()		2011-12-19 23:05:44 +02:00
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r	Backport of WL#5953 from MySQL 5.6	2011-12-19 23:05:44 +02:00
t	Merge with 5.2.	2011-12-11 11:34:44 +02:00