/**
* 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.optiq;
import org.eigenbase.rel.InvalidRelException;
import org.eigenbase.rel.JoinRel;
import org.eigenbase.rel.RelNode;
import org.eigenbase.relopt.*;
import org.eigenbase.trace.EigenbaseTrace;
import java.util.logging.Logger;
/**
* Rule that converts a {@link JoinRel} to a {@link DrillJoinRel}, which is implemented by Drill "join" operation.
*/
public class DrillJoinRule extends RelOptRule {
public static final RelOptRule INSTANCE = new DrillJoinRule();
protected static final Logger tracer = EigenbaseTrace.getPlannerTracer();
private DrillJoinRule() {
super(
RelOptRule.some(JoinRel.class, Convention.NONE, RelOptRule.any(RelNode.class), RelOptRule.any(RelNode.class)),
"DrillJoinRule");
}
@Override
public void onMatch(RelOptRuleCall call) {
final JoinRel join = (JoinRel) call.rel(0);
final RelNode left = call.rel(1);
final RelNode right = call.rel(2);
final RelTraitSet traits = join.getTraitSet().plus(DrillRel.CONVENTION);
final RelNode convertedLeft = convert(left, traits);
final RelNode convertedRight = convert(right, traits);
try {
call.transformTo(new DrillJoinRel(join.getCluster(), traits, convertedLeft, convertedRight, join.getCondition(),
join.getJoinType()));
} catch (InvalidRelException e) {
tracer.warning(e.toString());
}
}
}