Ted Yu created FLINK-9185:

             Summary: Potential null dereference in 
                 Key: FLINK-9185
                 URL: https://issues.apache.org/jira/browse/FLINK-9185
             Project: Flink
          Issue Type: Bug
            Reporter: Ted Yu

        if (alternative != null
          && alternative.hasState()
          && alternative.size() == 1
          && approveFun.apply(reference, alternative.iterator().next())) {
The return value from approveFun.apply would be unboxed.
We should check that the return value is not null.

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