SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function equals (children 1)
     ExpressionList (children 2)
      Function base64Decode (children 1)
       ExpressionList (children 1)
        Function base64Encode (children 1)
         ExpressionList (children 1)
          Literal \'foo\'
      Literal \'foo\'
    Function equals (children 1)
     ExpressionList (children 2)
      Function base64Encode (children 1)
       ExpressionList (children 1)
        Function base64Decode (children 1)
         ExpressionList (children 1)
          Literal \'Zm9v\'
      Literal \'Zm9v\'