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https://issues.apache.org/jira/browse/IMPALA-11365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17555125#comment-17555125
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Daniel Becker commented on IMPALA-11365:
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https://gerrit.cloudera.org/#/c/18629/
> Dereferencing null pointer in TopNNode
> --------------------------------------
>
> Key: IMPALA-11365
> URL: https://issues.apache.org/jira/browse/IMPALA-11365
> Project: IMPALA
> Issue Type: Bug
> Reporter: Daniel Becker
> Assignee: Daniel Becker
> Priority: Major
>
> In the constructor of TopNNode, if {{pnode.partition_comparator_config_}} is
> NULL, we initialise {{partition_cmp_}} with a NULL pointer. However, when
> initialising {{{}partition_heaps_{}}}, we dereference {{partition_cmp_}}
> because {{ComparatorWrapper}} expects a reference.
> This has so far not lead to a crash because in this case the comparator of
> {{partition_heaps_}} is not used, but assigning a NULL pointer to a reference
> is undefined behaviour.
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