Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/4266
Thanks for the update @hongyuhong!
I will take this PR from here. The logic looks very good but I would like
to refactor some parts (mainly the `WindowJoinUtil`).
I will open a new PR with your work and my commit on top, probably later
today.
It would be great if you could review and check my PR.
@wuchong your review is of course also highly welcome :-)
Thank you, Fabian
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