docs: def multiget_slice(self, keys, column_parent, predicate, consistency_level):
      """
      Performs a get_slice for column_parent and predicate for the given keys in parallel.
  
      Parameters:
       - keys
       - column_parent
       - predicate
       - consistency_level
      """
      self._seqid += 1
      d = self._reqs[self._seqid] = defer.Deferred()
      self.send_multiget_slice(keys, column_parent, predicate, consistency_level)
      return d