Attila Magyar created HIVE-22925:
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Summary: 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
Fix For: 4.0.0
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 ascending 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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