[
https://issues.apache.org/jira/browse/HIVE-22925?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Attila Magyar reassigned HIVE-22925:
------------------------------------
> 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
>
>
> 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.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
