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https://issues.apache.org/jira/browse/FLINK-9736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16532726#comment-16532726
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Sihua Zhou commented on FLINK-9736:
-----------------------------------
Hi [~yuzhih...@gmail.com] I think this might look like a non issue, because
`heapOfKeyGroupHeaps` is a heap-of-heap that created on the constructer of
{{KeyGroupPartitionedPriorityQueue}} to maintain the timer structure base on
the heap of each key group, and we never call `poll()` on it.
> 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
> Assignee: vinoyang
> Priority: Minor
>
> {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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