Github user liurenjie1024 commented on the issue:
    @bowenli86 @fhueske UT added.
    This class is a utility class which can be the base class of many process 
function implementations in flink table. Its counterpart for the legacy 
`ProcessFunction `interface, `ProcessFunctionWithCleanupState`, has been 
inherited by many implementations. In fact, my other 
[PR]( depends on this.


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