/**
* 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.List;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.config.Screen;
import org.apache.drill.exec.physical.config.SelectionVectorRemover;
import org.apache.drill.exec.physical.config.UnionExchange;
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.RelNode;
import org.eigenbase.rel.SingleRel;
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;
public class UnionExchangePrel extends ExchangePrel {
public UnionExchangePrel(RelOptCluster cluster, RelTraitSet traitSet, RelNode input) {
super(cluster, traitSet, input);
assert input.getConvention() == Prel.DRILL_PHYSICAL;
}
/**
* A UnionExchange processes a total of M rows coming from N senders and
* combines them into a single output stream. Note that there is
* no sort or merge operation going on. For costing purposes, we can
* assume each sender is sending M/N rows to a single receiver.
* (See DrillCostBase for symbol notations)
* C = CPU cost of SV remover for M/N rows
* + Network cost of sending M/N rows to 1 destination.
* So, C = (s * M/N) + (w * M/N)
* Total cost = N * C
*/
@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 rowWidth = child.getRowType().getFieldCount() * DrillCostBase.AVG_FIELD_WIDTH;
double svrCpuCost = DrillCostBase.SVR_CPU_COST * inputRows;
double networkCost = DrillCostBase.BYTE_NETWORK_COST * inputRows * rowWidth;
DrillCostFactory costFactory = (DrillCostFactory)planner.getCostFactory();
return costFactory.makeCost(inputRows, svrCpuCost, 0, networkCost);
}
@Override
public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {
return new UnionExchangePrel(getCluster(), traitSet, sole(inputs));
}
public PhysicalOperator getPhysicalOperator(PhysicalPlanCreator creator) throws IOException {
Prel child = (Prel) this.getChild();
PhysicalOperator childPOP = child.getPhysicalOperator(creator);
if(PrelUtil.getSettings(getCluster()).isSingleMode()) return childPOP;
UnionExchange g = new UnionExchange(childPOP);
return creator.addMetadata(this, g);
}
@Override
public SelectionVectorMode getEncoding() {
return SelectionVectorMode.NONE;
}
}