2012-03-21 15:42:00.424495+00:00 https://api.launchpad.net/1.0/bugs/903169 https://api.launchpad.net/1.0/~sergefp https://api.launchpad.net/1.0/maria/+milestone/5.3 https://api.launchpad.net/1.0/bugs/903169/linked_branches https://api.launchpad.net/1.0/bugs/903169/activity https://bugs.launchpad.net/bugs/903169 Sergey Petrunia Michael Widenius Maria 5.3 New Low 2011-12-12 12:18:29.468799+00:00 | ALL | NULL | NULL | NULL | NULL | 100 | | | 2 | DERIVED | t1 | ALL | NULL | NULL | NULL | NULL | 10 | | | 2 | DERIVED | t2 | ALL | NULL | NULL | NULL | NULL | 10 | Using join buffer (flat, BNL join) | +----+-------------+------------+------+---------------+------+---------+------+------+------------------------------------+ 3 rows in set (0.01 sec) flush status; select * from (select t1.a, t2.b from t1, t2) T; show status like 'created%'; +-------------------------+-------+ | Variable_name | Value | +-------------------------+-------+ | Created_tmp_disk_tables | 0 | | Created_tmp_files | 0 | | Created_tmp_tables | 1 | +-------------------------+-------+ 3 rows in set (0.00 sec) set optimizer_switch='derived_merge=on'; explain select * from (select t1.a, t2.b from t1, t2) T; +----+-------------+-------+------+---------------+------+---------+------+------+------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+------+------------------------------------+ | 1 | SIMPLE | t1 | ALL | NULL | NULL | NULL | NULL | 10 | | | 1 | SIMPLE | t2 | ALL | NULL | NULL | NULL | NULL | 10 | Using join buffer (flat, BNL join) | +----+-------------+-------+------+---------------+------+---------+------+------+------------------------------------+ 2 rows in set (0.00 sec) flush status; select * from (select t1.a, t2.b from t1, t2) T; show status like 'created%'; +-------------------------+-------+ | Variable_name | Value | +-------------------------+-------+ | Created_tmp_disk_tables | 0 | | Created_tmp_files | 0 | | Created_tmp_tables | 1 | +-------------------------+-------+ 3 rows in set (0.00 sec)]]> bug Sergey Petrunia added bug maria: milestone Sergey Petrunia maria: milestone Sergey Petrunia maria: assignee Sergey Petrunia maria: importance Sergey Petrunia maria: assignee Michael Widenius Sergey Petrunia Sergey Petrunia