Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3470
Thanks for the PR @shaoxuan-wang. I haven't had a detailed look yet. I
think we also need non-retract versions of `MIN` and `MAX`. The retracted
version cannot be used to compute unbounded OVER windows and will be less
efficient for batch queries (which do not need retraction).
Thanks, Fabian
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