wangpeibin713 commented on issue #7786: [FLINK-11706] Add the SumFunction to support KeyedStream.sum URL: https://github.com/apache/flink/pull/7786#issuecomment-465968792 ``` DataStream<Tuple2<Long, Integer[]>> src = env.fromCollection(Arrays.asList( new Tuple2<>(1L, new Integer[]{2, 4}), new Tuple2<>(1L, new Integer[]{3, 6}), new Tuple2<>(1L, new Integer[]{4, 8}) )); ``` with the flatmap function as your code, the output of the datastream is : ``` (1,2) (1,6) (1,9) (1,15) (1,19) (1,27) ``` my expected output is : ``` (1,[2, 4]) (1,[5, 10]) (1,[9, 18]) ``` > How about the below code > > ``` > src.flatMap(new FlatMapFunction<Tuple2<Long, Integer[]>, Tuple2<Long, Integer>>() { > @Override > public void flatMap(Tuple2<Long, Integer[]> value, Collector<Tuple2<Long, Integer>> out) throws Exception { > for (Integer v : value.f1) { > out.collect(new Tuple2<>(value.f0, v)); > } > } > }).keyBy(0) > .sum(1) > .print(); > ```
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