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https://issues.apache.org/jira/browse/HIVE-8613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14255985#comment-14255985
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Ashutosh Chauhan commented on HIVE-8613:
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No strong technical reason, just that we haven't done enough testing on
cluster-by / distribute-by / sort-by. So, we have disabled it until we are
confident that CBO can handle those features well. We do want to enable cbo on
those queries eventually.
> 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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