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https://issues.apache.org/jira/browse/FLINK-7025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16066101#comment-16066101
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Fabian Hueske commented on FLINK-7025:
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I agree. IMO, we should go for the keyed state (NullByteKeySelector) approach.
This will also be more consistent with the other Over window operators.
> Using NullByteKeySelector for Unbounded ProcTime NonPartitioned Over
> --------------------------------------------------------------------
>
> Key: FLINK-7025
> URL: https://issues.apache.org/jira/browse/FLINK-7025
> Project: Flink
> Issue Type: Bug
> Reporter: sunjincheng
> Assignee: sunjincheng
>
> Currently we added `Cleanup State` feature. But It not work well if we
> enabled the stateCleaning on Unbounded ProcTime NonPartitioned Over window,
> Because in `ProcessFunctionWithCleanupState` we has using the keyed state.
> So, In this JIRA. I'll change the `Unbounded ProcTime NonPartitioned Over`
> to `partitioned Over` by using NullByteKeySelector. OR created a
> `NonKeyedProcessFunctionWithCleanupState`. But I think the first way is
> simpler. What do you think? [~fhueske]
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