mysql run set_mode endless.

[pynixwang]

SET sql_mode=(SELECT CONCAT(@@sql_mode, ',PIPES_AS_CONCAT,NO_ENGINE_SUBSTITUTION')),time_zone='+00:00',NAMES utf8mb4 COLLATE utf8mb4_unicode_ci

what 's this?
it is bad for debug my app, why it run forever? run at connected?