expect return "syntax error" message when executing sql like 'select *,select ... from...'

[yexiaoli88]

• dble version：5.6.29-dble-9.9.9.9-c51d005-20180927104851

• steps：
  step1. query in dble

mysql> select *, select 3 from a_test order by id;
ERROR 1242 (HY000): Subquery returns more than 1 row

step2 query in mysql

mysql> select *, select 3 from a_test order by id;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'select 3 from a_test order by id' at line 1

• expect result：
  error message return from step1 should like the error message return from step 2 /label ~BUG

[irene-coming]

purpose: select *, （select 3） from a_test order by id;

[yanhuqing666]

the same reason with #718