/**
* 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 java.io.IOException;
import java.util.Iterator;
import org.apache.drill.exec.ExecConstants;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.config.ExternalSort;
import org.apache.drill.exec.physical.config.Sort;
import org.apache.drill.exec.planner.cost.DrillCostBase;
import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory;
import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
import org.eigenbase.rel.RelCollation;
import org.eigenbase.rel.RelNode;
import org.eigenbase.rel.SortRel;
import org.eigenbase.rel.metadata.RelMetadataQuery;
import org.eigenbase.relopt.RelOptCluster;
import org.eigenbase.relopt.RelOptCost;
import org.eigenbase.relopt.RelOptPlanner;
import org.eigenbase.relopt.RelTraitSet;
import org.eigenbase.rex.RexNode;
public class SortPrel extends SortRel implements Prel {
/** Creates a DrillSortRel. */
public SortPrel(RelOptCluster cluster, RelTraitSet traits, RelNode input, RelCollation collation) {
super(cluster, traits, input, collation);
}
/** Creates a DrillSortRel with offset and fetch. */
public SortPrel(RelOptCluster cluster, RelTraitSet traits, RelNode input, RelCollation collation, RexNode offset, RexNode fetch) {
super(cluster, traits, input, collation, offset, fetch);
}
@Override
public RelOptCost computeSelfCost(RelOptPlanner planner) {
if(PrelUtil.getSettings(getCluster()).useDefaultCosting()) {
//We use multiplier 0.05 for TopN operator, and 0.1 for Sort, to make TopN a preferred choice.
return super.computeSelfCost(planner).multiplyBy(.1);
}
RelNode child = this.getChild();
double inputRows = RelMetadataQuery.getRowCount(child);
// int rowWidth = child.getRowType().getPrecision();
int numSortFields = this.collation.getFieldCollations().size();
double cpuCost = DrillCostBase.COMPARE_CPU_COST * numSortFields * inputRows * (Math.log(inputRows)/Math.log(2));
double diskIOCost = 0; // assume in-memory for now until we enforce operator-level memory constraints
// TODO: use rowWidth instead of avgFieldWidth * numFields
// avgFieldWidth * numFields * inputRows
double numFields = this.getRowType().getFieldCount();
long fieldWidth = PrelUtil.getPlannerSettings(planner).getOptions()
.getOption(ExecConstants.AVERAGE_FIELD_WIDTH_KEY).num_val;
double memCost = fieldWidth * numFields * inputRows;
DrillCostFactory costFactory = (DrillCostFactory) planner.getCostFactory();
return costFactory.makeCost(inputRows, cpuCost, diskIOCost, 0, memCost);
}
@Override
public PhysicalOperator getPhysicalOperator(PhysicalPlanCreator creator) throws IOException {
Prel child = (Prel) this.getChild();
PhysicalOperator childPOP = child.getPhysicalOperator(creator);
Sort g = new ExternalSort(childPOP, PrelUtil.getOrdering(this.collation, getChild().getRowType()), false);
return creator.addMetadata(this, g);
}
@Override
public SortPrel copy(
RelTraitSet traitSet,
RelNode newInput,
RelCollation newCollation,
RexNode offset,
RexNode fetch) {
return new SortPrel(getCluster(), traitSet, newInput, newCollation);
}
@Override
public Iterator<Prel> iterator() {
return PrelUtil.iter(getChild());
}
@Override
public <T, X, E extends Throwable> T accept(PrelVisitor<T, X, E> logicalVisitor, X value) throws E {
return logicalVisitor.visitPrel(this, value);
}
@Override
public SelectionVectorMode[] getSupportedEncodings() {
return SelectionVectorMode.NONE_AND_TWO;
}
@Override
public SelectionVectorMode getEncoding() {
return SelectionVectorMode.FOUR_BYTE;
}
@Override
public boolean needsFinalColumnReordering() {
return true;
}
}