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| author | Igor Babaev <igor@askmonty.org> | 2011-06-06 12:19:35 -0700 |
|---|---|---|
| committer | Igor Babaev <igor@askmonty.org> | 2011-06-06 12:19:35 -0700 |
| commit | db0c3406011d9a6d6fdb98c1c1f7925d243bd1f9 (patch) | |
| tree | 7288647c4e707fffc4362f4c71198c99be828231 /mysql-test/r/derived.result | |
| parent | 3bf08e549a78ad12191f6b1ca49719bc667664ef (diff) | |
| download | mariadb-git-db0c3406011d9a6d6fdb98c1c1f7925d243bd1f9.tar.gz | |
Fixed LP bug #793436.
When looking for the execution plan of a derived table to be materialized
JOIN::optimize finds out that all joined tables of the derived table
contain not more than one row then the derived table should be maretialized
at the optimization stage.
Added a test case for the bug.
Adjusted results in other test cases.
Diffstat (limited to 'mysql-test/r/derived.result')
| -rw-r--r-- | mysql-test/r/derived.result | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/mysql-test/r/derived.result b/mysql-test/r/derived.result index 7cc2af3616f..fe803ed37a5 100644 --- a/mysql-test/r/derived.result +++ b/mysql-test/r/derived.result @@ -407,3 +407,21 @@ MIN(i) 1 DROP TABLE t1; # End of 5.0 tests +# +# LP bug #793436: query with a derived table for which optimizer proves +# that it contains not more than 1 row +# +CREATE TABLE t1 (a int, KEY (a)) ; +INSERT INTO t1 VALUES (3), (1); +CREATE TABLE t2 (a int); +INSERT INTO t2 VALUES (3); +EXPLAIN +SELECT * FROM (SELECT DISTINCT * FROM t2) t, t1 WHERE t1.a = t.a; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY <derived2> system NULL NULL NULL NULL 1 +1 PRIMARY t1 ref a a 5 const 1 Using index +2 DERIVED t2 system NULL NULL NULL NULL 1 +SELECT * FROM (SELECT DISTINCT * FROM t2) t, t1 WHERE t1.a = t.a; +a a +3 3 +DROP TABLE t1,t2; |