SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function generateSerialID (children 1)
     ExpressionList (children 1)
      Function concat (children 1)
       ExpressionList (children 2)
        Function currentDatabase (children 1)
         ExpressionList
        Literal \'y\'
