wangpeibin713 edited a comment on issue #7786: [FLINK-11706] Add the SumFunction to support KeyedStream.sum URL: https://github.com/apache/flink/pull/7786#issuecomment-465985556 After this transform function done， some function（maybe flatmap + keyBy + reduce ） should be called to combine the result value into Integer[]. It's not inconvenient for the developer. so I want to introduce this feature. It's transparent to developer. > 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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