klion26 commented on issue #7786: [FLINK-11706] Add the SumFunction to support KeyedStream.sum URL: https://github.com/apache/flink/pull/7786#issuecomment-465961173 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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