/**
* 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.optiq.cost;
import org.eigenbase.rel.RelCollationTraitDef;
import org.eigenbase.relopt.ConventionTraitDef;
import org.eigenbase.relopt.RelOptPlanner;
import org.eigenbase.relopt.volcano.VolcanoPlanner;
/**
* Refinement of {@link org.eigenbase.relopt.volcano.VolcanoPlanner} for Hive.
*
* <p>
* It uses {@link org.apache.hadoop.hive.ql.optimizer.optiq.cost.HiveCost} as
* its cost model.
*/
public class HiveVolcanoPlanner extends VolcanoPlanner {
private static final boolean ENABLE_COLLATION_TRAIT = true;
/** Creates a HiveVolcanoPlanner. */
public HiveVolcanoPlanner() {
super(HiveCost.FACTORY, null);
}
public static RelOptPlanner createPlanner() {
final VolcanoPlanner planner = new HiveVolcanoPlanner();
planner.addRelTraitDef(ConventionTraitDef.INSTANCE);
if (ENABLE_COLLATION_TRAIT) {
planner.addRelTraitDef(RelCollationTraitDef.INSTANCE);
}
return planner;
}
}