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https://issues.apache.org/jira/browse/HIVE-22925?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Magyar updated HIVE-22925:
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Status: Patch Available (was: Open)
> Implement TopNKeyFilter efficiency check
> ----------------------------------------
>
> Key: HIVE-22925
> URL: https://issues.apache.org/jira/browse/HIVE-22925
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Attila Magyar
> Assignee: Attila Magyar
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-22925.1.patch, HIVE-22925.2.patch,
> HIVE-22925.3.patch
>
>
> In certain cases the TopNKey filter might work in an inefficient way and adds
> extra CPU overhead. For example if the rows are coming in an descending order
> but the filter wants the top N smallest elements the filter will forward
> everything.
> Inefficient should be detected in runtime so that the filter can be disabled
> of the ration between forwarder_rows/total_rows is too high.
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