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From Nicolas Lalevée (JIRA) <j...@apache.org>
Subject [jira] [Created] (HIVE-8613) percentile_approx raise a comparator error
Date Mon, 27 Oct 2014 17:33:34 GMT
Nicolas Lalevée created HIVE-8613:
-------------------------------------

             Summary: 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


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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