/**
* 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 org.apache.hadoop.hive.contrib.udf.example;
import java.util.List;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
/**
* UDFExampleStructPrint.
*
*/
@Description(name = "example_structprint",
value = "_FUNC_(obj) - Example UDAF that returns contents of an object")
public class UDFExampleStructPrint extends UDF {
public String evaluate(Object a) {
if (a == null) {
return null;
}
List<Object> s = (List<Object>) a;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.size(); i++) {
sb.append("(" + i + ":" + s.get(i) + ")");
}
return sb.toString();
}
}