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MDEV-430: Server crashes in select_describe on EXPLAIN with materialization+semijoin, etc

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- Don't do early cleanup of uncorrelated subqueries if we're running an EXPLAIN.
This commit is contained in:
Sergey Petrunya
2012-08-28 15:15:05 +04:00
parent 0af0e7a70a
commit 2d99ea454f
7 changed files with 95 additions and 11 deletions
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14
mysql-test/t/subselect.test
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@@ -5721,5 +5721,19 @@ set global userstat=@tmp_mdev410;
DROP TABLE t1,t2,t3,t4;
--echo #
--echo # MDEV-430: Server crashes in select_describe on EXPLAIN with
--echo # materialization+semijoin, 2 nested subqueries, aggregate functions
--echo #
CREATE TABLE t1 (a INT, KEY(a));
INSERT INTO t1 VALUES (1),(8);
CREATE TABLE t2 (b INT, KEY(b));
INSERT INTO t2 VALUES (45),(17),(20);
EXPLAIN SELECT * FROM t1 WHERE EXISTS ( SELECT a FROM t1, t2 WHERE b = a GROUP BY a HAVING a <> 1 ) ;
DROP TABLE t1,t2;
--echo # return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;