总之，找到了解决方案。
package hive;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.Text;
public class UAStructUDF extends GenericUDF {
private Object[] result;
@Override
public String getDisplayString(String[] arg0) {
return "My display string";
public static void main(String... args) {
UAStructUDF ua = new UAStructUDF();
ua.parseUAString("");
@Override
public ObjectInspector initialize(ObjectInspector[] arg0) throws UDFArgumentException {
// Define the field names for the struct<> and their types
ArrayList<String> structFieldNames = new ArrayList<String>();
ArrayList<ObjectInspector> structFieldObjectInspectors = new ArrayList<ObjectInspector>();
// fill struct field names
// segmentname
structFieldNames.add("idlpsegmentname");
structFieldObjectInspectors.add(PrimitiveObjectInspectorFactory.writableStringObjectInspector);
// segmentvalue
structFieldNames.add("idlpsegmentvalue");
structFieldObjectInspectors.add(PrimitiveObjectInspectorFactory.writableStringObjectInspector);
StructObjectInspector si = ObjectInspectorFactory.getStandardStructObjectInspector(structFieldNames,
structFieldObjectInspectors);
return ObjectInspectorFactory.getStandardListObjectInspector(si);
// return si;
@Override
public Object evaluate(DeferredObject[] args) throws HiveException {
if (args == null || args.length < 1) {
throw new HiveException("args is empty");
if (args[0].get() == null) {
throw new HiveException("args contains null instead of object");
Object argObj = args[0].get();
// get argument
String argument = null;
if (argObj instanceof Text) {
argument = ((Text) argObj).toString();
} else if (argObj instanceof String) {
argument = (String) argObj;
} else {
throw new HiveException(
"Argument is neither a Text nor String, it is a " + argObj.getClass().getCanonicalName());
// parse UA string and return struct, which is just an array of objects:
// Object[]
return parseUAString(argument);
private Object parseUAString(String argument) {
String test = "acxiom_cluster,03|aff_celeb_ent,Y";
List<Object[]> ret = new ArrayList<Object[]>();
for (String s : test.split("\\|")) {
String arr[] = s.split(",");
Object[] o = new Object[2];
o[0] = new Text(arr[0]);
o[1] = new Text(arr[1]);
ret.add(o);