/**
* 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.logical.DrillFilterRel;
import org.apache.drill.exec.planner.logical.RelOptHelper;
import org.eigenbase.rel.RelNode;
import org.eigenbase.relopt.RelOptRule;
import org.eigenbase.relopt.RelOptRuleCall;
import org.eigenbase.relopt.RelTraitSet;
public class FilterPrule extends Prule {
public static final RelOptRule INSTANCE = new FilterPrule();
private FilterPrule() {
super(RelOptHelper.some(DrillFilterRel.class, RelOptHelper.any(RelNode.class)), "FilterPrule");
}
@Override
public void onMatch(RelOptRuleCall call) {
final DrillFilterRel filter = (DrillFilterRel) call.rel(0);
final RelNode input = filter.getChild();
RelTraitSet traits = input.getTraitSet().plus(Prel.DRILL_PHYSICAL);
RelNode convertedInput = convert(input, traits);
boolean transform = new Subset(call).go(filter, convertedInput);
if (!transform) {
call.transformTo(new FilterPrel(filter.getCluster(), convertedInput.getTraitSet(), convertedInput, filter.getCondition()));
}
}
private class Subset extends SubsetTransformer<DrillFilterRel, RuntimeException> {
public Subset(RelOptRuleCall call) {
super(call);
}
@Override
public RelNode convertChild(DrillFilterRel filter, RelNode rel) {
return new FilterPrel(filter.getCluster(), rel.getTraitSet(), rel, filter.getCondition());
}
}
}