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BUG#938131: Subquery materialization is not used in CREATE TABLE SELECT

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- Enable subquery materialization for CREATE TABLE ... SELECT.
This commit is contained in:
Sergey Petrunya 2012-02-24 22:42:37 +04:00
commit 8871806788
3 changed files with 37 additions and 3 deletions
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14
mysql-test/t/subselect_sj_mat.test
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@ -1559,6 +1559,20 @@ WHERE a IN (
DROP TABLE t1;
--echo #
--echo # BUG#938131: Subquery materialization is not used in CREATE TABLE SELECT
--echo #
CREATE TABLE t1(a int);
INSERT INTO t1 values(1),(2);
CREATE TABLE t2(a int);
INSERT INTO t2 values(1),(2);
--echo # Should use Materialization:
EXPLAIN SELECT * FROM t1 WHERE a IN (SELECT * FROM t2 GROUP BY a HAVING a > 1);
flush status;
CREATE TABLE t3 SELECT * FROM t1 WHERE a IN (SELECT * FROM t2 GROUP BY a HAVING a > 1);
SHOW STATUS LIKE 'Created_tmp_tables';
DROP TABLE t1,t2,t3;
--echo # This must be at the end:
set optimizer_switch=@subselect_sj_mat_tmp;
set join_cache_level=@save_join_cache_level;