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https://issues.apache.org/jira/browse/HIVE-22726?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Magyar updated HIVE-22726:
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Attachment: HIVE-22726.2.patch
> TopN Key optimizer should use array instead of priority queue
> -------------------------------------------------------------
>
> Key: HIVE-22726
> URL: https://issues.apache.org/jira/browse/HIVE-22726
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Attila Magyar
> Assignee: Attila Magyar
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-22726.1.patch, HIVE-22726.2.patch
>
>
> The TopN key optimizer currently uses a priority queue for keeping track of
> the largest/smallest rows. Its max size is the same as the user specified
> limit. This should be replaced a more cache line friendly array with a small
> (128) maximum size and see how much performance is gained.
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