@Override
    public KTable<K, V> reduce(final Reducer<V> adder,
                               final Reducer<V> subtractor,
                               final Materialized<K, V, KeyValueStore<Bytes, byte[]>> materialized) {
        return reduce(adder, subtractor, NamedInternal.empty(), materialized);
    }
The implementation class of {@link KGroupedTable}.

@param <K> the key type
@param <V> the value type
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KGroupedTableImpl.java