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https://issues.apache.org/jira/browse/KYLIN-4180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16938404#comment-16938404
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ASF GitHub Bot commented on KYLIN-4180:
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TempleZhou commented on pull request #861: KYLIN-4180 Prevent abnormal CPU
usage by limiting flat filters length
URL: https://github.com/apache/kylin/pull/861
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> Prevent abnormal CPU usage by limiting flat filters length
> ----------------------------------------------------------
>
> Key: KYLIN-4180
> URL: https://issues.apache.org/jira/browse/KYLIN-4180
> Project: Kylin
> Issue Type: Improvement
> Components: Metadata
> Affects Versions: v2.4.0, v2.5.0, v2.6.0
> Reporter: Temple Zhou
> Assignee: Temple Zhou
> Priority: Major
>
> The following SQL will lead to the list returned by
> org.apache.kylin.metadata.filter.TupleFilter#cartesianProduct become very
> large, and the process to producing the List will use lots of CPU.
> {code:sql}
> select * from temp.test_filter
> where ((a >= 0 and a <= 1)
> or (a >= 1 and a <= 2)
> or (a >= 2 and a <= 3)
> ...
> or (a >= 300 and a <= 301)
> ) and ((b >= 0 and b <= 1)
> or (b >= 1 and b <= 2)
> or (b >= 2 and b <= 3)
> ...
> or (b >= 300 and b <= 301)
> )
> {code}
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