ReducePrePhase(Context &ctx, size_t dia_id, size_t num_partitions, KeyExtractor key_extractor, ReduceFunction reduce_function, std::vector< BlockWriter > &emit, const ReduceConfig &config=ReduceConfig(), const IndexFunction &index_function=IndexFunction(), const EqualToFunction &equal_to_function=EqualToFunction(), const HashFunction hash_function=HashFunction()) | ReducePrePhase< TableItem, Key, Value, KeyExtractor, ReduceFunction, VolatileKey, BlockWriter, ReduceConfig, IndexFunction, EqualToFunction, HashFunction, true > | inline |