'Makes a Next call that will modify the instance.
Args:
config: The datastore_rpc.Configuration to use for the call.
req: The request to send with the call.
Returns:
A UserRPC object that can be used to fetch the result of the RPC.'

def _make_next_rpc_call(self, config, req):

    return self._batch_shared.conn._make_rpc_call(config, 'Next', req, datastore_pb.QueryResult(), self.__query_result_hook)
