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https://issues.apache.org/jira/browse/SPARK-22179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16194680#comment-16194680
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Zhenhua Wang commented on SPARK-22179:
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[~srowen] Yes, I planned to close this after the new issue is resolved :)
> percentile_approx should choose the first element if it already reaches the
> percentage
> --------------------------------------------------------------------------------------
>
> Key: SPARK-22179
> URL: https://issues.apache.org/jira/browse/SPARK-22179
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Zhenhua Wang
>
> percentile_approx should choose the first element if it already reaches the
> percentage.
> For example, given input data 1 to 10, if a user queries 10% (or even less)
> percentile, it should return 1 (instead of 2), because the first value 1
> already reaches 10%. Currently it returns a wrong answer: 2.
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