Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1553#issuecomment-182969700
Might be a stupid question, but what if the partitioner depends on the
number of elements. E.g. if you use `partitionCustom` with `Partitioner` which
counts internally the elements and assigns the output channel number with
respect to this count. In such a case, a combiner would change the result.
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