def _prune(self, key_value_map):
    raise NotImplementedError
Groupby iterator
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/datastore/datastore_query.py/FilterPredicate._prune--crossover with--dataset/ETHPy150Open pydata/pandas/pandas/core/groupby.py/_GroupBy.__iter__