/**
* 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.common.logical.data.NamedExpression;
import org.apache.drill.exec.ExecConstants;
import org.apache.drill.exec.expr.holders.IntHolder;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.config.HashAggregate;
import org.apache.drill.exec.planner.cost.DrillCostBase;
import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory;
import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
import org.eigenbase.rel.AggregateCall;
import org.eigenbase.rel.AggregateRelBase;
import org.eigenbase.rel.InvalidRelException;
import org.eigenbase.rel.RelNode;
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 java.io.IOException;
import java.util.BitSet;
import java.util.List;
public class HashAggPrel extends AggPrelBase implements Prel{
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(HashAggPrel.class);
public HashAggPrel(RelOptCluster cluster, RelTraitSet traits, RelNode child, BitSet groupSet,
List<AggregateCall> aggCalls, OperatorPhase phase) throws InvalidRelException {
super(cluster, traits, child, groupSet, aggCalls, phase);
}
public AggregateRelBase copy(RelTraitSet traitSet, RelNode input, BitSet groupSet, List<AggregateCall> aggCalls) {
try {
return new HashAggPrel(getCluster(), traitSet, input, getGroupSet(), aggCalls,
this.getOperatorPhase());
} catch (InvalidRelException e) {
throw new AssertionError(e);
}
}
@Override
public RelOptCost computeSelfCost(RelOptPlanner planner) {
if(PrelUtil.getSettings(getCluster()).useDefaultCosting()) {
return super.computeSelfCost(planner).multiplyBy(.1);
}
RelNode child = this.getChild();
double inputRows = RelMetadataQuery.getRowCount(child);
int numGroupByFields = this.getGroupCount();
int numAggrFields = this.aggCalls.size();
// cpu cost of hashing each grouping key
double cpuCost = DrillCostBase.HASH_CPU_COST * numGroupByFields * inputRows;
// add cpu cost for computing the aggregate functions
cpuCost += DrillCostBase.FUNC_CPU_COST * numAggrFields * inputRows;
double diskIOCost = 0; // assume in-memory for now until we enforce operator-level memory constraints
// TODO: use distinct row count
// + hash table template stuff
double factor = PrelUtil.getPlannerSettings(planner).getOptions()
.getOption(ExecConstants.HASH_AGG_TABLE_FACTOR_KEY).float_val;
long fieldWidth = PrelUtil.getPlannerSettings(planner).getOptions()
.getOption(ExecConstants.AVERAGE_FIELD_WIDTH_KEY).num_val;
// table + hashValues + links
double memCost =
(
(fieldWidth * numGroupByFields) +
IntHolder.WIDTH +
IntHolder.WIDTH
) * inputRows * factor;
DrillCostFactory costFactory = (DrillCostFactory) planner.getCostFactory();
return costFactory.makeCost(inputRows, cpuCost, diskIOCost, 0 /* network cost */, memCost);
}
@Override
public PhysicalOperator getPhysicalOperator(PhysicalPlanCreator creator) throws IOException {
Prel child = (Prel) this.getChild();
HashAggregate g = new HashAggregate(child.getPhysicalOperator(creator),
keys.toArray(new NamedExpression[keys.size()]),
aggExprs.toArray(new NamedExpression[aggExprs.size()]),
1.0f);
return creator.addMetadata(this, g);
}
@Override
public SelectionVectorMode[] getSupportedEncodings() {
return SelectionVectorMode.DEFAULT;
}
@Override
public SelectionVectorMode getEncoding() {
return SelectionVectorMode.NONE;
}
}