message: Set approved_tuple_count for pushed IsNull/IsNotNull filter check
diff: @@ -271,6 +271,7 @@ static idx_t TemplatedNullSelection(SelectionVector &sel, idx_t &approved_tuple_
  if (mask.AllValid()) {
  // no NULL values
  if (IS_NULL) {
  + approved_tuple_count = 0;
  return 0;
  } else {
  return approved_tuple_count;
  