MariaDB 10.3.9 Spider Engine DB does not run when execute ther following query

• This is Problem Query
  SELECT `user_no`, LEFT(`push_id`, 256) FROM `test_db`.`tb_test` LIMIT 1000;

• This is No Problem Query
  SELECT `user_no`, LEFT(`push_id`, 256) as A FROM `test_db`.`tb_test` LIMIT 1000;

The difference between the above two queries is alias

but

It works well on the data node.