/**
* 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.drill.exec.planner.physical;
import org.apache.drill.exec.planner.common.DrillScreenRelBase;
import org.apache.drill.exec.planner.logical.DrillRel;
import org.apache.drill.exec.planner.logical.DrillScreenRel;
import org.apache.drill.exec.planner.logical.RelOptHelper;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.plan.RelOptRule;
import org.apache.calcite.plan.RelOptRuleCall;
import org.apache.calcite.plan.RelTraitSet;
public class ScreenPrule extends Prule{
public static final RelOptRule INSTANCE = new ScreenPrule();
public ScreenPrule() {
super(RelOptHelper.some(DrillScreenRel.class, DrillRel.DRILL_LOGICAL, RelOptHelper.any(RelNode.class)), "Prel.ScreenPrule");
}
@Override
public void onMatch(RelOptRuleCall call) {
final DrillScreenRelBase screen = (DrillScreenRelBase) call.rel(0);
final RelNode input = call.rel(1);
final RelTraitSet traits = input.getTraitSet().plus(Prel.DRILL_PHYSICAL).plus(DrillDistributionTrait.SINGLETON);
final RelNode convertedInput = convert(input, traits);
DrillScreenRelBase newScreen = new ScreenPrel(screen.getCluster(), screen.getTraitSet().plus(Prel.DRILL_PHYSICAL).plus(DrillDistributionTrait.SINGLETON), convertedInput);
call.transformTo(newScreen);
}
}