Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3639
Windows are immutable and must be, as they are keys in hash tables.
I am also not sure how this code can possibly compile, as it tries to
update a final field.
For changes to the implementation of the windowing logic, please post on
the mailing list or in JIRA what you want to solve and how you want to solve
it. Because the logic is complex, we cannot simply merge changes without a good
design discussion first.
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