streams/src/main/java/org/apache/kafka/streams/kstream/internals/TimeWindowedCogroupedKStreamImpl.java [51:98]:
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                                     final InternalStreamsBuilder builder,
                                     final Set<String> subTopologySourceNodes,
                                     final String name,
                                     final CogroupedStreamAggregateBuilder<K, V> aggregateBuilder,
                                     final StreamsGraphNode streamsGraphNode,
                                     final Map<KGroupedStreamImpl<K, ?>, Aggregator<? super K, ? super Object, V>> groupPatterns) {
        super(name, null, null, subTopologySourceNodes, streamsGraphNode, builder);
        //keySerde and valueSerde are null because there are many different groupStreams that they could be from
        this.windows = windows;
        this.aggregateBuilder = aggregateBuilder;
        this.groupPatterns = groupPatterns;
    }


    @Override
    public KTable<Windowed<K>, V> aggregate(final Initializer<V> initializer) {
        return aggregate(initializer, Materialized.with(null, null));
    }

    @Override
    public KTable<Windowed<K>, V> aggregate(final Initializer<V> initializer,
                                            final Materialized<K, V, WindowStore<Bytes, byte[]>> materialized) {
        return aggregate(initializer, NamedInternal.empty(), materialized);
    }

    @Override
    public KTable<Windowed<K>, V> aggregate(final Initializer<V> initializer,
                                            final Named named) {
        return aggregate(initializer, named, Materialized.with(null, null));
    }

    @Override
    public KTable<Windowed<K>, V> aggregate(final Initializer<V> initializer,
                                            final Named named,
                                            final Materialized<K, V, WindowStore<Bytes, byte[]>> materialized) {
        Objects.requireNonNull(initializer, "initializer can't be null");
        Objects.requireNonNull(named, "named can't be null");
        Objects.requireNonNull(materialized, "materialized can't be null");
        final MaterializedInternal<K, V, WindowStore<Bytes, byte[]>> materializedInternal = new MaterializedInternal<>(
            materialized,
            builder,
            CogroupedKStreamImpl.AGGREGATE_NAME);
        return aggregateBuilder.build(
            groupPatterns,
            initializer,
            new NamedInternal(named),
            materialize(materializedInternal),
            materializedInternal.keySerde() != null ?
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streams/src/main/java/org/apache/kafka/streams/kstream/internals/SlidingWindowedCogroupedKStreamImpl.java [46:92]:
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                                        final InternalStreamsBuilder builder,
                                        final Set<String> subTopologySourceNodes,
                                        final String name,
                                        final CogroupedStreamAggregateBuilder<K, V> aggregateBuilder,
                                        final StreamsGraphNode streamsGraphNode,
                                        final Map<KGroupedStreamImpl<K, ?>, Aggregator<? super K, ? super Object, V>> groupPatterns) {
        super(name, null, null, subTopologySourceNodes, streamsGraphNode, builder);
        //keySerde and valueSerde are null because there are many different groupStreams that they could be from
        this.windows = windows;
        this.aggregateBuilder = aggregateBuilder;
        this.groupPatterns = groupPatterns;
    }

    @Override
    public KTable<Windowed<K>, V> aggregate(final Initializer<V> initializer) {
        return aggregate(initializer, Materialized.with(null, null));
    }

    @Override
    public KTable<Windowed<K>, V> aggregate(final Initializer<V> initializer,
                                            final Materialized<K, V, WindowStore<Bytes, byte[]>> materialized) {
        return aggregate(initializer, NamedInternal.empty(), materialized);
    }

    @Override
    public KTable<Windowed<K>, V> aggregate(final Initializer<V> initializer,
                                            final Named named) {
        return aggregate(initializer, named, Materialized.with(null, null));
    }

    @Override
    public KTable<Windowed<K>, V> aggregate(final Initializer<V> initializer,
                                            final Named named,
                                            final Materialized<K, V, WindowStore<Bytes, byte[]>> materialized) {
        Objects.requireNonNull(initializer, "initializer can't be null");
        Objects.requireNonNull(named, "named can't be null");
        Objects.requireNonNull(materialized, "materialized can't be null");
        final MaterializedInternal<K, V, WindowStore<Bytes, byte[]>> materializedInternal = new MaterializedInternal<>(
            materialized,
            builder,
            CogroupedKStreamImpl.AGGREGATE_NAME);
        return aggregateBuilder.build(
            groupPatterns,
            initializer,
            new NamedInternal(named),
            materialize(materializedInternal),
            materializedInternal.keySerde() != null ?
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