2012-05-21 21:08:20.591135+00:00 https://api.launchpad.net/1.0/bugs/1002508 https://api.launchpad.net/1.0/~igorb-seattle https://api.launchpad.net/1.0/maria/+milestone/5.5 https://api.launchpad.net/1.0/bugs/1002508/linked_branches https://api.launchpad.net/1.0/bugs/1002508/activity https://bugs.launchpad.net/bugs/1002508 Igor Babaev Igor Babaev Maria 5.5 Confirmed Medium 2012-05-21 20:56:52.985267+00:00 EXPLAIN -> SELECT t1.a FROM t1 LEFT JOIN t2 ON t1.a=t2.a ORDER BY t1.a; +------+-------------+-------+-------+---------------+---------+---------+-----------+------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +------+-------------+-------+-------+---------------+---------+---------+-----------+------+-------------+ | 1 | SIMPLE | t1 | index | NULL | PRIMARY | 4 | NULL | 4 | Using index | | 1 | SIMPLE | t2 | ref | i_a | i_a | 5 | test.t1.a | 2 | Using index | +------+-------------+-------+-------+---------------+---------+---------+-----------+------+-------------+ The expected number of the examined rows from t1 is 4 though it should be 8 as for the following query: MariaDB [test]> EXPLAIN -> SELECT t1.a FROM t1 LEFT JOIN t2 ON t1.a=t2.a ORDER BY t1.a; +------+-------------+-------+-------+---------------+---------+---------+-----------+------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +------+-------------+-------+-------+---------------+---------+---------+-----------+------+-------------+ | 1 | SIMPLE | t1 | index | NULL | PRIMARY | 4 | NULL | 4 | Using index | | 1 | SIMPLE | t2 | ref | i_a | i_a | 5 | test.t1.a | 2 | Using index | +------+-------------+-------+-------+---------------+---------+---------+-----------+------+-------------+]]> bug Igor Babaev added bug maria: status Igor Babaev maria: importance Igor Babaev maria: assignee Igor Babaev maria: milestone Igor Babaev Igor Babaev