ASF GitHub Bot commented on FLINK-8919:

Github user fhueske commented on the issue:

    Taking a step back. What's the purpose of this change? It adds a class to 
the `flink-table` module that is not used anywhere and not part of the public 
API of the Table API or SQL.
    Why do we need it?

> Add KeyedProcessFunctionWIthCleanupState
> ----------------------------------------
>                 Key: FLINK-8919
>                 URL: https://issues.apache.org/jira/browse/FLINK-8919
>             Project: Flink
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.6.0
>            Reporter: Renjie Liu
>            Assignee: Renjie Liu
>            Priority: Minor
>             Fix For: 1.6.0
> ProcessFunctionWithCleanupState is a useful tool and I think we also need one 
> for the new KeyedProcessFunction api.

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