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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 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.optimizer.physical;
A hierarchy physical optimizer, which contains a list of PhysicalPlanResolver. Each resolver has its own set of optimization rule.
public class PhysicalOptimizer {
  private PhysicalContext pctx;
  public PhysicalOptimizer(PhysicalContext pctxHiveConf hiveConf) {
    this. = pctx;

create the list of physical plan resolvers.

  private void initialize(HiveConf hiveConf) {
    if (hiveConf.getBoolVar(..)) {
      .add(new SkewJoinResolver());
    if (hiveConf.getBoolVar(..)) {
      .add(new CommonJoinResolver());

invoke all the resolvers one-by-one, and alter the physical plan.

  public PhysicalContext optimize() throws SemanticException {
    for (PhysicalPlanResolver r : ) {
       = r.resolve();
    return ;
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