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https://issues.apache.org/jira/browse/IMPALA-11477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Noemi Pap-Takacs resolved IMPALA-11477.
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Resolution: Fixed
> Codegen Heapify in SortedRunMerger
> ----------------------------------
>
> Key: IMPALA-11477
> URL: https://issues.apache.org/jira/browse/IMPALA-11477
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Noemi Pap-Takacs
> Assignee: Noemi Pap-Takacs
> Priority: Minor
>
> SortedRunMerger is used to merge multiple, already sorted runs. It is used
> for external merge in the sorter (SortNode, PartialSortNode and TopNNode),
> and in KRPC data stream receiver (ExchangeNode).
> SortedRunMerger builds and maintains a min heap of the sorted input runs.
> Codegening this Heapify function and the comparator could improve the
> performance of the merger.
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