/**
* 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.udtf.example;
import java.util.ArrayList;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDTF;
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;
/**
* GenericUDTFCount2 outputs the number of rows seen, twice. It's output twice
* to test outputting of rows on close with lateral view.
*
*/
@Description(name = "udtfCount2",
value = "_FUNC_(col) - UDF outputs the number of rows seen, twice.")
public class GenericUDTFCount2 extends GenericUDTF {
private transient Integer count = Integer.valueOf(0);
private transient Object forwardObj[] = new Object[1];
@Override
public void close() throws HiveException {
forwardObj[0] = count;
forward(forwardObj);
forward(forwardObj);
}
@Override
public StructObjectInspector initialize(ObjectInspector[] argOIs) throws UDFArgumentException {
ArrayList<String> fieldNames = new ArrayList<String>();
ArrayList<ObjectInspector> fieldOIs = new ArrayList<ObjectInspector>();
fieldNames.add("col1");
fieldOIs.add(PrimitiveObjectInspectorFactory.javaIntObjectInspector);
return ObjectInspectorFactory.getStandardStructObjectInspector(fieldNames,
fieldOIs);
}
@Override
public void process(Object[] args) throws HiveException {
count = Integer.valueOf(count.intValue() + 1);
}
}