ql/src/java/org/apache/hadoop/hive/ql/HashTableLoaderFactory.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.hadoop.hive.ql;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.conf.HiveConf.ConfVars;
import org.apache.hadoop.hive.ql.exec.HashTableLoader;

/**
 * HashTableLoaderFactory is used to determine the strategy
 * of loading the hashtables for the MapJoinOperator
 */
public class HashTableLoaderFactory {

  private HashTableLoaderFactory() {
  }

  public static HashTableLoader getLoader(Configuration hconf) {
    if (HiveConf.getVar(hconf, ConfVars.HIVE_EXECUTION_ENGINE).equals("tez")) {
      return new org.apache.hadoop.hive.ql.exec.tez.HashTableLoader();
    } else if (HiveConf.getVar(hconf, ConfVars.HIVE_EXECUTION_ENGINE).equals("spark")) {
      return new org.apache.hadoop.hive.ql.exec.spark.HashTableLoader();
    } else {
      return new org.apache.hadoop.hive.ql.exec.mr.HashTableLoader();
    }
  }

}