klion26 edited a comment on issue #7786: [FLINK-11706] Add the SumFunction to support KeyedStream.sum URL: https://github.com/apache/flink/pull/7786#issuecomment-465976553 how about some code like below ``` int index = 0 for (Integer v : value.f1) { out.collect(new Tuple2<>(String.format("%d_%d", value.f0, index++), v)); } ```
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