def cas(self, key, value, time=0, min_compress_len=0, namespace=None):
    return self._set_with_policy(MemcacheSetRequest.CAS, key, value,
                                 time, namespace)
Like :func:`petl.util.materialise.columns` but stratified by values of the
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/memcache/__init__.py/Client.cas--crossover with--dataset/ETHPy150Open alimanfoo/petl/petl/util/materialise.py/facetcolumns