Github user fhueske commented on the pull request:
https://github.com/apache/incubator-flink/pull/37#issuecomment-51531949
Looks good to me.
Note, I only browsed the code and did not run it.
I'll add a comment to JIRA as well. I have a working prototype for full
support of custom partitioner, sorter, and groupers (combine is not supported
yet, though). However, the solution goes through the full program compilation
stack and I'd like to get some feedback before I continue...
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