SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Literal \'(1, \\\'Hello\\\')\'
      Literal \'Variant(Tuple(UInt32, String), Tuple(Int64, String))\'
