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https://issues.apache.org/jira/browse/HIVE-22925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17047880#comment-17047880
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Hive QA commented on HIVE-22925:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12994864/HIVE-22925.3.patch
{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.
{color:green}SUCCESS:{color} +1 due to 18076 tests passed
Test results:
https://builds.apache.org/job/PreCommit-HIVE-Build/20873/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/20873/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-20873/
Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.YetusPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12994864 - PreCommit-HIVE-Build
> 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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