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KTable<K, Long> count(final String storeName);
KTable<K, V> reduce(final Reducer<V> adder, final Reducer<V> subtractor);
<VR> KTable<K, VR> aggregate(final Initializer<VR> initializer, final Aggregator<? super K, ? super V, VR> adder, final Aggregator<? super K, ? super V, VR> subtractor)
In KGroupedStream.java:
KTable<K, Long> count(final String storeName);
KTable<K, V> reduce(final Reducer<V> reducer);
<VR> KTable<K, VR> aggregate(final Initializer<VR> initializer, final Aggregator<? super K, ? super V, VR> aggregator, final Serde<VR> aggValueSerde);
Remove unnecessary methods
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