Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3370
Thanks @haohui! The only thing missing would in fact be a test. IMO,
extending `WindowAggregateTest` by copying the methods and adapting them to
`proctime` would be sufficient.
Let's see if #3302 is continued or not. If not, I'd like to add this PR.
Thanks, Fabian
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