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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.optimizer.physical;

import java.util.ArrayList;

import org.apache.hadoop.hive.ql.lib.DefaultGraphWalker;
import org.apache.hadoop.hive.ql.lib.Dispatcher;
import org.apache.hadoop.hive.ql.lib.GraphWalker;
import org.apache.hadoop.hive.ql.lib.Node;
import org.apache.hadoop.hive.ql.optimizer.physical.index.IndexWhereTaskDispatcher;
import org.apache.hadoop.hive.ql.parse.SemanticException;

public class IndexWhereResolver implements PhysicalPlanResolver {

  @Override
  public PhysicalContext resolve(PhysicalContext physicalContext) throws SemanticException {
    Dispatcher dispatcher = new IndexWhereTaskDispatcher(physicalContext);
    GraphWalker opGraphWalker = new DefaultGraphWalker(dispatcher);
    ArrayList topNodes = new ArrayList();
    topNodes.addAll(physicalContext.getRootTasks());
    opGraphWalker.startWalking(topNodes, null);

    return physicalContext;
  }
}