Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3471
Thanks for the review @KurtYoung. I think we should be fine regarding the
tests. `DistinctReduce` is called in 2 tests in `AggregationsITCase`
(`testDistinct()` and `testDistinctAfterAggregate`) and in the union tests in
the Table API and SQL `SetOperatorsITCase`. That are 5 tests. What do you think?
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