Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/4350
Hi @greghogan, the changes look good and the PR is ready to be merged.
If you like, you can simplify the test before merging by using field
position keys (as in `testGroupedReduceWithFieldPositionKey()`) instead of a
`KeySelector`. That would remove the key extractor and projector map operators
and make the plan a bit easier to verify.
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