def row_processor(self, query, context, result):
    (procs, labels) = zip(*[ent.row_processor(query, context, result) for ent in self._entities])
    proc = self.bundle.create_row_processor(query, procs, labels)
    return (proc, self._label_name)
def row_processor(self, query, context, result):
    (procs, labels) = zip(*[ent.row_processor(query, context, result) for ent in self._entities])
    proc = self.bundle.create_row_processor(query, procs, labels)
    return (proc, self._label_name)