[jira] [Created] (FLINK-5335) Allow ListCheckpointed user functions to return null

[Shang Yuanchun (Jira)]

Stefan Richter created FLINK-5335:
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             Summary: Allow ListCheckpointed user functions to return null
                 Key: FLINK-5335
                 URL: https://issues.apache.org/jira/browse/FLINK-5335
             Project: Flink
          Issue Type: Improvement
          Components: State Backends, Checkpointing
            Reporter: Stefan Richter
            Assignee: Stefan Richter


Currently, it is not allowed to return null as result for the methods in {{ListCheckpointed}}. From a usability perspective, I think it is nicer to allow this.



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