2 rows in set, 1 warning (0.00 sec)
mysql> show warnings;
/* select#1 */ select `xx`.`t5`.`id5` AS `id5`,`xx`.`t5`.`a5` AS `a5`,
`xx`.`t5`.`b5` AS `b5`,'1' AS `id1`,'1' AS `a1`,NULL AS `b1`
from `xx`.`t5` join `xx`.`t1`
where (`xx`.`t5`.`a5` = 1)
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