/*
* 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.
*/
package hivemall.tools.array;
import java.util.List;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.hive.ql.udf.UDFType;
import org.apache.hadoop.io.IntWritable;
@Description(name = "subarray", value = "_FUNC_(array<int> orignal, int fromIndex, int toIndex)"
+ " - Returns a slice of the original array"
+ " between the inclusive fromIndex and the exclusive toIndex")
@UDFType(deterministic = true, stateful = false)
public class SubarrayUDF extends UDF {
public List<IntWritable> evaluate(List<IntWritable> array, int fromIndex, int toIndex) {
if (array == null) {
return null;
}
final int arraylength = array.size();
if (fromIndex < 0) {
fromIndex = 0;
}
if (toIndex > arraylength) {
toIndex = arraylength;
}
return array.subList(fromIndex, toIndex);
}
}