Nicolas Lalevée created HIVE-8613:
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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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