code: def table_definitions(self):
          
          prop = self._get_sub_prop("tableDefinitions")
          if prop is not None:
              prop = _from_api_repr_table_defs(prop)
          return prop
docs: Dict[str, google.cloud.bigquery.external_config.ExternalConfig]:
          Definitions for external tables or :data:`None` if not set.
  
          See
          https://g.co/cloud/bigquery/docs/reference/rest/v2/jobs#configuration.query.tableDefinitions