SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Literal \'(1, (2,\\\'foo\\\'))\'
      Literal \'Tuple(Int, Tuple(Int, String))\'
