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https://issues.apache.org/jira/browse/HIVE-8613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Navis reassigned HIVE-8613:
---------------------------

    Assignee: Navis  (was: Nicolas Lalevée)

> percentile_approx raise a comparator error
> ------------------------------------------
>
>                 Key: HIVE-8613
>                 URL: https://issues.apache.org/jira/browse/HIVE-8613
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.12.0
>            Reporter: Nicolas Lalevée
>            Assignee: Navis
>         Attachments: HIVE-8613.1.patch.txt, HIVE-8613.2.patch.txt
>
>
> I have implemented an UADF which wrap around percentile_approx, and I have 
> been hit by the following stack trace:
> {noformat}
> Caused by: java.lang.IllegalArgumentException: Comparison method violates its 
> general contract!
>       at java.util.ComparableTimSort.mergeLo(ComparableTimSort.java:714)
>       at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:451)
>       at java.util.ComparableTimSort.mergeCollapse(ComparableTimSort.java:376)
>       at java.util.ComparableTimSort.sort(ComparableTimSort.java:182)
>       at java.util.ComparableTimSort.sort(ComparableTimSort.java:146)
>       at java.util.Arrays.sort(Arrays.java:472)
>       at java.util.Collections.sort(Collections.java:155)
>       at 
> org.apache.hadoop.hive.ql.udf.generic.NumericHistogram.merge(NumericHistogram.java:161)
> {noformat}
> In my use case, with my special UADF, there were Double.NaN
> Implementing a proper double comparaison with Double.compare in 
> com.goojet.mapred.hive.udf.NumericHistogram.Coord.compareTo(Object) fixes it.



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