Impossible WHERE noticed after reading const tables

source  [^capture.txt] 

source context1.txt

+------+-------------+-------+-------+---------------+---------+---------+-------+------+--------------------------------+

| id   | select_type | table | type  | possible_keys | key     | key_len | ref   | rows | Extra                          |

+------+-------------+-------+-------+---------------+---------+---------+-------+------+--------------------------------+

|    1 | PRIMARY     | OUTR1 | const | PRIMARY       | PRIMARY | 4       | const | 1    |                                |

|    1 | PRIMARY     | INNR1 | ALL   | NULL          | NULL    | NULL    | NULL  | 2    | Using where; FirstMatch(OUTR1) |

|    1 | PRIMARY     | OUTR2 | ALL   | NULL          | NULL    | NULL    | NULL  | 2    |                                |

+------+-------------+-------+-------+---------------+---------+---------+-------+------+--------------------------------+

[code}

h6.Replay:

{code:sql}

+------+-------------+-------+------+---------------+------+---------+------+------+-----------------------------------------------------+

| id   | select_type | table | type | possible_keys | key  | key_len | ref  | rows | Extra                                               |

+------+-------------+-------+------+---------------+------+---------+------+------+-----------------------------------------------------+

|    1 | PRIMARY     | NULL  | NULL | NULL          | NULL | NULL    | NULL | NULL | Impossible WHERE noticed after reading const tables |

+------+-------------+-------+------+---------------+------+---------+------+------+----------------------------------------------------