def __prepare_bloom(self):
self.__bloom = pybloom_live.ScalableBloomFilter()<EOL>columns = [getattr(self.__table.c, key) for key in self.__update_keys]<EOL>keys = select(columns).execution_options(stream_results=True).execute()<EOL>for key in keys:<EOL><INDENT>self.__bloom.add(tuple(key))<EOL><DEDENT>
Prepare bloom for existing checks