def table_definitions(self):
        """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
        """
        prop = self._get_sub_prop("tableDefinitions")
        if prop is not None:
            prop = _from_api_repr_table_defs(prop)
        return prop
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