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A few APIs to support local aggregation need to be added to DataStream class, list below:

Code Block
languagejava
KeyedStream<TLocalKeyedStream<T, Tuple> localKeyBy(int… fields);
KeyedStream<TLocalKeyedStream<T, Tuple> localKeyBy(Keys<T> keys);
<K> KeyedStream<TLocalKeyedStream<T, K> localKeyBy(KeySelector<T, K> keySelector);
<K> KeyedStream<TLocalKeyedStream<T, K> localKeyBy(KeySelector<T, K> keySelector, TypeInformation<K> keyType);

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