org.apache.hadoop.hive.ql.plan.DummyStoreDesc Maven / Gradle / Ivy

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/**
 * 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.ql.plan;
import org.apache.hadoop.hive.ql.plan.Explain.Level;



/**
 * Dummy Store Desc. This is only used by sort-merge joins to store the
 * result for the small table (sub-query) being scanned.
 */
@Explain(displayName = "Dummy Store", explainLevels = { Level.USER, Level.DEFAULT, Level.EXTENDED })
public class DummyStoreDesc extends AbstractOperatorDesc {
  private static final long serialVersionUID = 1L;

  public DummyStoreDesc() {
  }

  @Override
  public DummyStoreDesc clone() {
    return new DummyStoreDesc();
  }
}