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/**
* 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.visitor;
import com.google.common.collect.Lists;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.exec.planner.physical.ExchangePrel;
import org.apache.drill.exec.planner.physical.HashToRandomExchangePrel;
import org.apache.drill.exec.planner.physical.PlannerSettings;
import org.apache.drill.exec.planner.physical.Prel;
import org.apache.drill.exec.planner.physical.PrelUtil;
import org.apache.drill.exec.planner.physical.ProjectPrel;
import org.apache.drill.exec.planner.physical.DrillDistributionTrait.DistributionField;
import org.apache.drill.exec.planner.physical.UnorderedDeMuxExchangePrel;
import org.apache.drill.exec.planner.physical.UnorderedMuxExchangePrel;
import org.apache.drill.exec.planner.sql.DrillSqlOperator;
import org.apache.drill.exec.server.options.OptionManager;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rel.type.RelDataTypeField;
import org.apache.calcite.rex.RexBuilder;
import org.apache.calcite.rex.RexNode;
import org.apache.calcite.rex.RexUtil;
import java.util.Collections;
import java.util.List;
public class InsertLocalExchangeVisitor extends BasePrelVisitor<Prel, Void, RuntimeException> {
private static final DrillSqlOperator SQL_OP_HASH64_WITH_NO_SEED = new DrillSqlOperator("hash64", 1, MajorType.getDefaultInstance(), true);
private static final DrillSqlOperator SQL_OP_HASH64_WITH_SEED = new DrillSqlOperator("hash64", 2, MajorType.getDefaultInstance(), true);
private static final DrillSqlOperator SQL_OP_CAST_INT = new DrillSqlOperator("castINT", 1, MajorType.getDefaultInstance(), true);
private final boolean isMuxEnabled;
private final boolean isDeMuxEnabled;
public static Prel insertLocalExchanges(Prel prel, OptionManager options) {
boolean isMuxEnabled = options.getOption(PlannerSettings.MUX_EXCHANGE.getOptionName()).bool_val;
boolean isDeMuxEnabled = options.getOption(PlannerSettings.DEMUX_EXCHANGE.getOptionName()).bool_val;
if (isMuxEnabled || isDeMuxEnabled) {
return prel.accept(new InsertLocalExchangeVisitor(isMuxEnabled, isDeMuxEnabled), null);
}
return prel;
}
public InsertLocalExchangeVisitor(boolean isMuxEnabled, boolean isDeMuxEnabled) {
this.isMuxEnabled = isMuxEnabled;
this.isDeMuxEnabled = isDeMuxEnabled;
}
@Override
public Prel visitExchange(ExchangePrel prel, Void value) throws RuntimeException {
Prel child = ((Prel)prel.getInput()).accept(this, null);
// Whenever we encounter a HashToRandomExchangePrel
// If MuxExchange is enabled, insert a UnorderedMuxExchangePrel before HashToRandomExchangePrel.
// If DeMuxExchange is enabled, insert a UnorderedDeMuxExchangePrel after HashToRandomExchangePrel.
if (!(prel instanceof HashToRandomExchangePrel)) {
return (Prel)prel.copy(prel.getTraitSet(), Collections.singletonList(((RelNode)child)));
}
Prel newPrel = child;
HashToRandomExchangePrel hashPrel = (HashToRandomExchangePrel) prel;
final List<String> childFields = child.getRowType().getFieldNames();
List <RexNode> removeUpdatedExpr = Lists.newArrayList();
if ( isMuxEnabled ) {
// Insert Project Operator with new column that will be a hash for HashToRandomExchange fields
List<DistributionField> fields = hashPrel.getFields();
List<String> outputFieldNames = Lists.newArrayList(childFields);
final RexBuilder rexBuilder = prel.getCluster().getRexBuilder();
final List<RelDataTypeField> childRowTypeFields = child.getRowType().getFieldList();
// First field has no seed argument for hash64 function.
final int firstFieldId = fields.get(0).getFieldId();
RexNode firstFieldInputRef = rexBuilder.makeInputRef(childRowTypeFields.get(firstFieldId).getType(), firstFieldId);
RexNode hashExpr = rexBuilder.makeCall(SQL_OP_HASH64_WITH_NO_SEED, firstFieldInputRef);
for (int i=1; i<fields.size(); i++) {
final int fieldId = fields.get(i).getFieldId();
RexNode inputRef = rexBuilder.makeInputRef(childRowTypeFields.get(fieldId).getType(), fieldId);
hashExpr = rexBuilder.makeCall(SQL_OP_HASH64_WITH_SEED, inputRef, hashExpr);
}
hashExpr = rexBuilder.makeCall(SQL_OP_CAST_INT, hashExpr);
List <RexNode> updatedExpr = Lists.newArrayList();
for ( RelDataTypeField field : childRowTypeFields) {
RexNode rex = rexBuilder.makeInputRef(field.getType(), field.getIndex());
updatedExpr.add(rex);
removeUpdatedExpr.add(rex);
}
outputFieldNames.add(PrelUtil.HASH_EXPR_NAME);
updatedExpr.add(hashExpr);
RelDataType rowType = RexUtil.createStructType(prel.getCluster().getTypeFactory(), updatedExpr, outputFieldNames);
ProjectPrel addColumnprojectPrel = new ProjectPrel(child.getCluster(), child.getTraitSet(), child, updatedExpr, rowType);
newPrel = new UnorderedMuxExchangePrel(addColumnprojectPrel.getCluster(), addColumnprojectPrel.getTraitSet(),
addColumnprojectPrel);
}
newPrel = new HashToRandomExchangePrel(prel.getCluster(),
prel.getTraitSet(), newPrel, ((HashToRandomExchangePrel) prel).getFields());
if (isDeMuxEnabled) {
HashToRandomExchangePrel hashExchangePrel = (HashToRandomExchangePrel) newPrel;
// Insert a DeMuxExchange to narrow down the number of receivers
newPrel = new UnorderedDeMuxExchangePrel(prel.getCluster(), prel.getTraitSet(), hashExchangePrel,
hashExchangePrel.getFields());
}
if ( isMuxEnabled ) {
// remove earlier inserted Project Operator - since it creates issues down the road in HashJoin
RelDataType removeRowType = RexUtil.createStructType(newPrel.getCluster().getTypeFactory(), removeUpdatedExpr, childFields);
ProjectPrel removeColumnProjectPrel = new ProjectPrel(newPrel.getCluster(), newPrel.getTraitSet(), newPrel, removeUpdatedExpr, removeRowType);
return removeColumnProjectPrel;
}
return newPrel;
}
@Override
public Prel visitPrel(Prel prel, Void value) throws RuntimeException {
List<RelNode> children = Lists.newArrayList();
for(Prel child : prel){
children.add(child.accept(this, null));
}
return (Prel) prel.copy(prel.getTraitSet(), children);
}
}
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