[jira] [Created] (FLINK-9958) Fix potential NPE for delta iteration of DataSet

[Shang Yuanchun (Jira)]

Ruidong Li created FLINK-9958:
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             Summary: Fix potential NPE for delta iteration of DataSet
                 Key: FLINK-9958
                 URL: https://issues.apache.org/jira/browse/FLINK-9958
             Project: Flink
          Issue Type: Bug
          Components: DataSet API
            Reporter: Ruidong Li
            Assignee: Ruidong Li






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