/**
* 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.DrillWriterRelBase;
import org.apache.drill.exec.planner.logical.DrillRel;
import org.apache.drill.exec.planner.logical.DrillWriterRel;
import org.apache.drill.exec.planner.logical.RelOptHelper;
import org.eigenbase.rel.RelCollation;
import org.eigenbase.rel.RelCollationTraitDef;
import org.eigenbase.rel.RelNode;
import org.eigenbase.relopt.RelOptRule;
import org.eigenbase.relopt.RelOptRuleCall;
import org.eigenbase.relopt.RelTraitSet;
import org.eigenbase.relopt.volcano.RelSubset;
public class WriterPrule extends Prule{
public static final RelOptRule INSTANCE = new WriterPrule();
public WriterPrule() {
super(RelOptHelper.some(DrillWriterRel.class, DrillRel.DRILL_LOGICAL, RelOptHelper.any(RelNode.class)),
"Prel.WriterPrule");
}
@Override
public void onMatch(RelOptRuleCall call) {
final DrillWriterRelBase writer = call.rel(0);
final RelNode input = call.rel(1);
final RelTraitSet traits = input.getTraitSet().plus(Prel.DRILL_PHYSICAL);
final RelNode convertedInput = convert(input, traits);
if (!new WriteTraitPull(call).go(writer, convertedInput)) {
DrillWriterRelBase newWriter = new WriterPrel(writer.getCluster(), convertedInput.getTraitSet(),
convertedInput, writer.getCreateTableEntry());
call.transformTo(newWriter);
}
}
private class WriteTraitPull extends SubsetTransformer<DrillWriterRelBase, RuntimeException> {
public WriteTraitPull(RelOptRuleCall call) {
super(call);
}
@Override
public RelNode convertChild(DrillWriterRelBase writer, RelNode rel) throws RuntimeException {
DrillDistributionTrait childDist = rel.getTraitSet().getTrait(DrillDistributionTraitDef.INSTANCE);
RelCollation childCollation = rel.getTraitSet().getTrait(RelCollationTraitDef.INSTANCE);
return new WriterPrel(writer.getCluster(),
writer.getTraitSet().plus(childDist).plus(childCollation).plus(Prel.DRILL_PHYSICAL),
rel, writer.getCreateTableEntry());
}
}
}