/**
* 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.logical;
import org.eigenbase.rel.ProjectRel;
import org.eigenbase.rel.RelNode;
import org.eigenbase.relopt.Convention;
import org.eigenbase.relopt.RelOptRule;
import org.eigenbase.relopt.RelOptRuleCall;
import org.eigenbase.relopt.RelTraitSet;
/**
* Rule that converts a {@link org.eigenbase.rel.ProjectRel} to a Drill "project" operation.
*/
public class DrillProjectRule extends RelOptRule {
public static final RelOptRule INSTANCE = new DrillProjectRule();
private DrillProjectRule() {
super(RelOptHelper.any(ProjectRel.class, Convention.NONE), "DrillProjectRule");
}
@Override
public void onMatch(RelOptRuleCall call) {
final ProjectRel project = (ProjectRel) call.rel(0);
final RelNode input = project.getChild();
final RelTraitSet traits = project.getTraitSet().plus(DrillRel.DRILL_LOGICAL);
final RelNode convertedInput = convert(input, input.getTraitSet().plus(DrillRel.DRILL_LOGICAL));
call.transformTo(new DrillProjectRel(project.getCluster(), traits, convertedInput, project.getProjects(), project
.getRowType()));
}
}