Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3783
Hi @huawei-flink ,
I'll close this PR later today when merging #5555.
#5555 adds runtime support for distinct aggregation and follows a similar
approach as this PR. However, it leverages the `MapView` feature and is
therefore a bit more generic.
Thanks for working on this. This PR led us in the right direction.
Best, Fabian---
