[jira] [Created] (FLINK-5883) Re-adding the Exception-thrown code for ListKeyGroupedIterator when the iterator is requested the second time

[Shang Yuanchun (Jira)]

lincoln.lee created FLINK-5883:
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             Summary: Re-adding the Exception-thrown code for ListKeyGroupedIterator when the iterator is requested the second time
                 Key: FLINK-5883
                 URL: https://issues.apache.org/jira/browse/FLINK-5883
             Project: Flink
          Issue Type: Improvement
            Reporter: lincoln.lee
            Assignee: lincoln.lee


Originally, ListKeyGroupedIterator ensured that a TraversableOnceException was thrown when the iterator is requested the second time within FLINK-1023, it was lost from FLINK-1110 unexpectedly, so add it back.



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