[GitHub] flink issue #5680: [FLINK-8919] Add KeyedProcessFunctionWithCleanupState.

[liurenjie1024]

Github user liurenjie1024 commented on the issue:

    https://github.com/apache/flink/pull/5680
  
    @bowenli86 This is a trivial change and most the code is copied from the 
non keyed counterpart, so I don't think we need a test.


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