/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/plan/UnionDesc.java

 1/**
 2 * Licensed to the Apache Software Foundation (ASF) under one
 3 * or more contributor license agreements.  See the NOTICE file
 4 * distributed with this work for additional information
 5 * regarding copyright ownership.  The ASF licenses this file
 6 * to you under the Apache License, Version 2.0 (the
 7 * "License"); you may not use this file except in compliance
 8 * with the License.  You may obtain a copy of the License at
 9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19package org.apache.hadoop.hive.ql.plan;
20
21import java.io.Serializable;
22
23/**
24 * unionDesc is a empty class currently. However, union has more than one input
25 * (as compared with forward), and therefore, we need a separate class.
26 **/
27@Explain(displayName = "Union")
28public class UnionDesc implements Serializable {
29  private static final long serialVersionUID = 1L;
30
31  private transient int numInputs;
32
33  @SuppressWarnings("nls")
34  public UnionDesc() {
35    numInputs = 2;
36  }
37
38  /**
39   * @return the numInputs
40   */
41  public int getNumInputs() {
42    return numInputs;
43  }
44
45  /**
46   * @param numInputs
47   *          the numInputs to set
48   */
49  public void setNumInputs(int numInputs) {
50    this.numInputs = numInputs;
51  }
52}