SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function equals (alias left_empty_str_ok) (children 1)
     ExpressionList (children 2)
      Function trimLeft (children 1)
       ExpressionList (children 2)
        Literal \'\'
        Literal \'#@\'
      Literal \'\'
    Function equals (alias right_empty_str_ok) (children 1)
     ExpressionList (children 2)
      Function trimRight (children 1)
       ExpressionList (children 2)
        Literal \'\'
        Literal \'#@\'
      Literal \'\'
    Function equals (alias both_empty_str_ok) (children 1)
     ExpressionList (children 2)
      Function trimBoth (children 1)
       ExpressionList (children 2)
        Literal \'\'
        Literal \'#@\'
      Literal \'\'
