code: def to_table_data(self):
          
  
          self._validate_source_data()
  
          header_list = []
          for json_record in self._buffer:
              for key in json_record:
                  if key not in header_list:
                      header_list.append(key)
  
          self._loader.inc_table_count()
  
          yield TableData(
              self._make_table_name(),
              header_list,
              self._buffer,
              dp_extractor=self._loader.dp_extractor,
              type_hints=self._extract_type_hints(header_list),
          )
docs: :raises ValueError:
          :raises pytablereader.error.ValidationError: