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https://issues.apache.org/jira/browse/KYLIN-5787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17835448#comment-17835448
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ASF subversion and git services commented on KYLIN-5787:
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Commit dd16079c42e4f6eb446945ec42980891934a20c6 in kylin's branch
refs/heads/kylin5 from Zhiting Guo
[ https://gitbox.apache.org/repos/asf?p=kylin.git;h=dd16079c42 ]
KYLIN-5787 Use t-digest as spark percentile_approx function
> Use t-digest as spark percentile_approx function
> ------------------------------------------------
>
> Key: KYLIN-5787
> URL: https://issues.apache.org/jira/browse/KYLIN-5787
> Project: Kylin
> Issue Type: Improvement
> Components: Job Engine, Query Engine
> Affects Versions: 5.0-beta
> Reporter: pengfei.zhan
> Assignee: pengfei.zhan
> Priority: Critical
> Fix For: 5.0-beta
>
>
> The underlying implementation of the percentile_approx function in KYLIN is
> the open-source t-digest.
> The underlying implementation of the percentile_approx function in spark is
> spark's own PercentileDigest (based on QuantileSummaries).
> Different implementations lead to different results.
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