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https://issues.apache.org/jira/browse/IMPALA-15376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on IMPALA-15376 started by Michael Smith.
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> Undefined AnalyticEvalNode::GetNext on empty window_tuples_
> -----------------------------------------------------------
>
> Key: IMPALA-15376
> URL: https://issues.apache.org/jira/browse/IMPALA-15376
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Michael Smith
> Assignee: Michael Smith
> Priority: Major
>
> AnalyticEvalNode::GetNext() unconditionally called window_tuples_.front()
> when deciding whether to transfer the prev tuple pool to the output batch.
> window_tuples_ can legitimately be empty at that point (e.g. right after all
> window tuples have been popped, or when prev_pool_last_window_idx_ was
> recorded as the -1 sentinel), so calling front() on the empty deque is
> undefined behavior.
> Newer Clang versions identify this as undefined in UBSAN builds.
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