Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1553#issuecomment-190124885
I do not have a concrete use case in mind, but it is certainly possible to
implement such a job in the DataSet API. Hence, it should be correctly
translated.
You can do this for example like this:
```
DataSet<Tuple2<String, Long>> data = ...
DataSet<Tuple2<String, Long>> pData = data.partitionByHash(0);
pData.map(new SomeMapFunc())
.output(new DiscardingOutputFormat<Tuple2<String, Integer>>());
pData.groupReduce(new SomeCombinableGReduceFunc())
.output(new DiscardingOutputFormat<Tuple2<String, Integer>>());
```
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