Details
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Bug
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Status: Closed
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Major
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Resolution: Fixed
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None
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None
Description
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.
Attachments
Attachments
Issue Links
- relates to
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HIVE-17896 TopNKey: Create a standalone vectorizable TopNKey operator
- Closed
- links to