Hive UDF Unknown exception:

[tom kersnick]

Gents,

Any ideas why this happens? Im using hive 0.50 with hadoop 20.2.

This is a super simple UDF.....

Im just taking the length of the values and then dividing by pi.  It keeps
popping up with this error:

FAILED: Unknown exception: [D cannot be cast to [Ljava.lang.Object;

Here is my approach:


package com.xyz.udf;

import org.apache.hadoop.hive.ql.exec.UDF;
import java.util.Collections;


public final class test extends UDF {
    public double evaluate(double[] values) {
    final Integer len = values.length;
    final Integer pi = len / 3.14159265;
        return values[pi];
}
}


hive> list
jars;
hive> add jar /tmp/hive_aux/x-y-z-udf-1.0-SNAPSHOT.jar;
Added /tmp/hive_aux/x-y-z-udf-1.0-SNAPSHOT.jar to class path
hive> create temporary function my_test as 'com.xyz.udf.test';
OK
Time taken: 0.41 seconds
hive> show
tables;
OK
userpool
test
Time taken: 3.167 seconds
hive> describe userpool;
OK
word    string
amount    int
Time taken: 0.098 seconds
hive> select my_test(amount) from
userpool;
FAILED: Unknown exception: [D cannot be cast to [Ljava.lang.Object;
hive> describe test;
OK
word    string
amount    string
Time taken: 0.134 seconds
hive> select my_test(amount) from
test;
FAILED: Unknown exception: [D cannot be cast to [Ljava.lang.Object;


Thanks in advance!

/tom