Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/4447
Final key-words on non-static methods should always be an exception, no
matter whether checkstyle marks them as a violation.
Talking to @NicoK offline, he mentioned that there have been commits with
such changes merged. What do we do about these now? Are we sure we did not void
a statement that the authors put in place to the code to be future proof`?
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