Github user fhueske commented on the pull request: https://github.com/apache/flink/pull/1255#issuecomment-165404528 Thanks @uce! I extended the `RangePartitionRewriter` to cover that case and will include the changes when I merge the PR. I also found that no combiners are inserted if the input of a reduce or combinable groupreduce is explicitly partitioned (FLINK-3179). This is not directly related to this PR (because it also affects `partitionByHash` and `partitionCustom`), but should be fixed soon. I am trying the PR right now on a cluster setup. Thanks @ChengXiangLi for your patience with this one!
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