GenericUDFDateSub udf = new GenericUDFDateSub();
ObjectInspector valueOI1 = PrimitiveObjectInspectorFactory.writableTimestampObjectInspector;
ObjectInspector valueOI2 = PrimitiveObjectInspectorFactory.javaIntObjectInspector;
ObjectInspector[] arguments = {valueOI1, valueOI2};
udf.initialize(arguments);
DeferredObject valueObj1 = new DeferredJavaObject(new TimestampWritable(new Timestamp(109, 06,
20, 4, 17, 52, 0)));
DeferredObject valueObj2 = new DeferredJavaObject(new Integer("3"));
DeferredObject[] args = {valueObj1, valueObj2};
Text output = (Text) udf.evaluate(args);