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-465961883 by the way, Sum Aggregator with multi fields with KeyedStream is also not supported now . I have another pr for this feature. https://github.com/apache/flink/pull/7638
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