message: Fix - json serialization edge case
diff: @@ -1107,7 +1107,9 @@ class Superset(BaseSupersetView):
  if not self.datasource_access(datasource):
  return json_error_response(DATASOURCE_ACCESS_ERR)
  - payload = json.dumps(datasource.values_for_column(column))
  + payload = json.dumps(
  + datasource.values_for_column(column),
  + default=utils.json_int_dttm_ser)
  return json_success(payload)
  def save_or_overwrite_slice(
  