Github user fhueske commented on the pull request:
https://github.com/apache/incubator-flink/pull/78#issuecomment-50073451
Nice one!
I'd prefer to use a ReduceFunction instead of a GroupReduceFunction because
it is automatically combinable (which is usually important if you do a Reduce
without groupBy) and shorter.
However, you would need to add another MapFunction for the final division.
You could also replace the first MapFunction by a FilterFunction and emit
only a record if the test is passed. This would mean that no records with
0-valued ints are emitted and therefore the summing becomes cheaper.
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