Tried this:
package com.eharmony.pipeline.analytics.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 half = len / 2;
return values[half];
}
}
Now it will not compile using Maven:
test.java:[8,27] illegal start of type
test.java:[8,37] ')' expected
test.java:[8,44] ';' expected
Thanks in advance.
/tom
On Wed, Mar 10, 2010 at 5:06 PM, Zheng Shao <[email protected]> wrote:
> Try "Double[]". Primitive arrays (like double[], int[]) are not
> supported yet, because that needs special handling for each of the
> primitive type.
>
> Zheng
>
> On Wed, Mar 10, 2010 at 4:55 PM, tom kersnick <[email protected]> wrote:
> > 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
> >
>
>
>
> --
> Yours,
> Zheng
>
