hive Hive User Defined Functions (UDF's) Hive UDF creation
Example
To create a UDF, we need to extend UDF (org.apache.hadoop.hive.ql.exec.UDF) class and implement evaluate method.
Once UDF is complied and JAR is build, we need to add jar to hive context to create a temporary/permanent function.
import org.apache.hadoop.hive.ql.exec.UDF;
class UDFExample extends UDF {
public String evaluate(String input) {
return new String("Hello " + input);
}
}
hive> ADD JAR <JAR NAME>.jar;
hive> CREATE TEMPORARY FUNCTION helloworld as 'package.name.UDFExample';
hive> select helloworld(name) from test;
