dawidwys commented on issue #7786: [FLINK-11706] Add the SumFunction to support KeyedStream.sum URL: https://github.com/apache/flink/pull/7786#issuecomment-465993329 Personally I don't like that semantic. Sum operation on array is not well defined. Some users could expect that result of plus on arrays should be concatenation of those. Therefore I am personally against introducing this feature.
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