Download a partition from another server.
        :param zookeeper_path: Path in zookeeper to fetch from
        :param settings: Settings for executing request to ClickHouse over db.raw() method
        :return: SQL Query

def fetch(self, zookeeper_path, settings=None):
        """
        Download a partition from another server.
        :param zookeeper_path: Path in zookeeper to fetch from
        :param settings: Settings for executing request to ClickHouse over db.raw() method
        :return: SQL Query
        """
        return self._partition_operation_sql('FETCH', settings=settings, from_part=zookeeper_path)