[jira] [Created] (FLINK-1210) Improve Error Message in Delta Iteratione when Next Workset does not Depend on Workset.

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-1210:
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             Summary: Improve Error Message in Delta Iteratione when Next Workset does not Depend on Workset.
                 Key: FLINK-1210
                 URL: https://issues.apache.org/jira/browse/FLINK-1210
             Project: Flink
          Issue Type: Bug
          Components: Optimizer
    Affects Versions: 0.7.0-incubating, 0.8-incubating
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 0.8-incubating, 0.7.1-incubating


Currently, the job fails with a NullPointerException in the NepheleJobGraphGenerator



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