Daniel Becker created IMPALA-11365:
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Summary: 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
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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