Ted Yu created FLINK-9736:
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Summary: Potential null reference in
KeyGroupPartitionedPriorityQueue#poll()
Key: FLINK-9736
URL: https://issues.apache.org/jira/browse/FLINK-9736
Project: Flink
Issue Type: Bug
Reporter: Ted Yu
{code}
final PQ headList = heapOfkeyGroupedHeaps.peek();
final T head = headList.poll();
{code}
{{peek}} call may return null.
The return value should be checked before de-referencing.
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