Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/4530
You're right @xccui, this is a trade off.
I thought about this again and agree with @aljoscha that it would be better
to avoid the additional method call. The `processWatermark()` method is called
many times in every DataStream program and the duplicated code are less than 10
lines of code in 4 classes.
I will do the refactoring and merge this PR.
Thanks, Fabian
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