https://blog.csdn.net/win7system/article/details/53333094
/*!mycat: sql=select id from t_contacts_timeline where main_user_id='60d5d3e6c8ab436ea9e3d358b09ebfb3' */
批量插入mycat无法确认数据具体插入到那个表，所以得先指定分表字段
