sql/hive/src/test/resources/hive-test-udfs/GenericUDTFCount2.java

/*
 * 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.spark.sql.hive.execution;

import java.util.ArrayList;

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;

public class GenericUDTFCount2 extends GenericUDTF
    implements java.io.Serializable {

  Integer count = 0;
  Object[] forwardObj = new Object[1];

  @Override
  public StructObjectInspector initialize(ObjectInspector[] args)
      throws UDFArgumentException {
    ArrayList<String> fieldNames = new ArrayList<>();
    ArrayList<ObjectInspector> fieldOIs = new ArrayList<>();
    fieldNames.add("col1");
    fieldOIs.add(PrimitiveObjectInspectorFactory.javaIntObjectInspector);
    return ObjectInspectorFactory.getStandardStructObjectInspector(
        fieldNames, fieldOIs);
  }

  @Override
  public void process(Object[] args) throws HiveException {
    count = count + 1;
  }

  @Override
  public void close() throws HiveException {
    forwardObj[0] = count;
    forward(forwardObj);
    forward(forwardObj);
  }
}