Github user nragon commented on the issue:
https://github.com/apache/flink/pull/3639
Closing due to #3642
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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 impl
