SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function isNotDistinctFrom (alias tuple_vs_null) (children 1)
     ExpressionList (children 2)
      Identifier c_tuple
      Literal NULL
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier 03611_nscmp_tbl
