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Navis commented on HIVE-8613: ----------------------------- Ok, I got it. Instead of disabling CBO on all group-bys, I've disabled CBO on the test. Reattaching patch for test. > 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, > HIVE-8613.3.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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)