/**
* 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.calcite.plan.RelOptRule;
import org.apache.calcite.plan.RelOptRuleCall;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.drill.exec.planner.logical.DrillDirectScanRel;
import org.apache.drill.exec.planner.logical.RelOptHelper;
public class DirectScanPrule extends Prule {
public static final RelOptRule INSTANCE = new DirectScanPrule();
public DirectScanPrule() {
super(RelOptHelper.any(DrillDirectScanRel.class), "Prel.DirectScanPrule");
}
@Override
public void onMatch(RelOptRuleCall call) {
final DrillDirectScanRel scan = call.rel(0);
final RelTraitSet traits = scan.getTraitSet().plus(Prel.DRILL_PHYSICAL);
final ScanPrel newScan = new ScanPrel(scan.getCluster(), traits, scan.getGroupScan(), scan.getRowType()) {
// direct scan (no execution) => no accidental column shuffling => no reordering
@Override
public boolean needsFinalColumnReordering() {
return false;
}
};
call.transformTo(newScan);
}
}