/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright 2011 Think Big Analytics.
 */

package thinkbig.hive.udf;

import java.util.*;

import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.io.Text;

/**
 * UDFArraySum
 *
 * UDF to sum an array of elements
 */
@Description(name = "array_offset",
         value = "_FUNC_(array<text>, double) - return the sum of the array elements")
public class UDFArraySum extends UDF {

    private Text result = new Text();

    public Text evaluate(List<String> array, int pos) {
    result.set(array.get(pos));
    return result;
    }
}

Add array sum UDF