[jira] [Created] (FLINK-4374) GroupReduce Broken for null Date

[Shang Yuanchun (Jira)]

Stefan Richter created FLINK-4374:
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             Summary: GroupReduce Broken for null Date
                 Key: FLINK-4374
                 URL: https://issues.apache.org/jira/browse/FLINK-4374
             Project: Flink
          Issue Type: Bug
          Components: DataSet API
            Reporter: Stefan Richter


The GroupReduceITCase has an error that allows a problem with {{nul}}l Dates to go uncovered:
 If I set the parallelism to 1 in {{testDateNullException()}} and all keys actually end up on the same operator, then there is a problem in the de/serialization.

It seems that {{null}} values are somehow skipped by the serialization process (e.g. maybe no {{null}} indicator is written), which leads to wrong deserializations.



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