请问可以支持UNION ALL语句吗？ #127
Description
例如：
select * from user1 limit 1
UNION ALL
select * from user2 limit 1
UNION ALL
select * from user3 limit 1;
{{ message }}
例如：
select * from user1 limit 1
UNION ALL
select * from user2 limit 1
UNION ALL
select * from user3 limit 1;