/*
* 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.pig.newplan.logical.optimizer;
import java.util.Collection;
import java.util.List;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.impl.util.MultiMap;
import org.apache.pig.newplan.DependencyOrderWalker;
import org.apache.pig.newplan.OperatorPlan;
import org.apache.pig.newplan.PlanWalker;
import org.apache.pig.newplan.ReverseDependencyOrderWalker;
import org.apache.pig.newplan.logical.expression.AllSameExpressionVisitor;
import org.apache.pig.newplan.logical.expression.LogicalExpression;
import org.apache.pig.newplan.logical.expression.LogicalExpressionPlan;
import org.apache.pig.newplan.logical.relational.LOCogroup;
import org.apache.pig.newplan.logical.relational.LOCross;
import org.apache.pig.newplan.logical.relational.LODistinct;
import org.apache.pig.newplan.logical.relational.LOFilter;
import org.apache.pig.newplan.logical.relational.LOForEach;
import org.apache.pig.newplan.logical.relational.LOGenerate;
import org.apache.pig.newplan.logical.relational.LOInnerLoad;
import org.apache.pig.newplan.logical.relational.LOJoin;
import org.apache.pig.newplan.logical.relational.LOLimit;
import org.apache.pig.newplan.logical.relational.LOLoad;
import org.apache.pig.newplan.logical.relational.LORank;
import org.apache.pig.newplan.logical.relational.LOSort;
import org.apache.pig.newplan.logical.relational.LOSplit;
import org.apache.pig.newplan.logical.relational.LOSplitOutput;
import org.apache.pig.newplan.logical.relational.LOStore;
import org.apache.pig.newplan.logical.relational.LOStream;
import org.apache.pig.newplan.logical.relational.LOUnion;
import org.apache.pig.newplan.logical.relational.LogicalRelationalNodesVisitor;
public class UidResetter extends LogicalRelationalNodesVisitor {
public UidResetter(OperatorPlan plan) throws FrontendException {
super(plan, new DependencyOrderWalker(plan));
}
@Override
public void visit(LOLoad load) throws FrontendException {
load.resetUid();
}
@Override
public void visit(LOFilter filter) throws FrontendException {
filter.resetUid();
ExpressionUidResetter uidResetter = new ExpressionUidResetter(filter.getFilterPlan());
uidResetter.visit();
}
@Override
public void visit(LOStore store) throws FrontendException {
store.resetUid();
}
@Override
public void visit(LOJoin join) throws FrontendException {
join.resetUid();
Collection<LogicalExpressionPlan> joinPlans = join.getExpressionPlanValues();
for (LogicalExpressionPlan joinPlan : joinPlans) {
ExpressionUidResetter fsResetter = new ExpressionUidResetter(joinPlan);
fsResetter.visit();
}
}
@Override
public void visit(LOForEach foreach) throws FrontendException {
foreach.resetUid();
OperatorPlan innerPlan = foreach.getInnerPlan();
PlanWalker newWalker = currentWalker.spawnChildWalker(innerPlan);
pushWalker(newWalker);
currentWalker.walk(this);
popWalker();
}
@Override
public void visit(LOGenerate gen) throws FrontendException {
gen.resetUid();
List<LogicalExpressionPlan> genPlans = gen.getOutputPlans();
for (LogicalExpressionPlan genPlan : genPlans) {
ExpressionUidResetter fsResetter = new ExpressionUidResetter(genPlan);
fsResetter.visit();
}
}
@Override
public void visit(LOInnerLoad load) throws FrontendException {
load.resetUid();
load.getProjection().resetUid();
}
@Override
public void visit(LOCogroup loCogroup) throws FrontendException {
loCogroup.resetUid();
MultiMap<Integer, LogicalExpressionPlan> expPlans = loCogroup.getExpressionPlans();
for (LogicalExpressionPlan expPlan : expPlans.values()) {
ExpressionUidResetter uidResetter = new ExpressionUidResetter(expPlan);
uidResetter.visit();
}
}
@Override
public void visit(LOSplit loSplit) throws FrontendException {
loSplit.resetUid();
}
@Override
public void visit(LOSplitOutput loSplitOutput) throws FrontendException {
loSplitOutput.resetUid();
ExpressionUidResetter uidResetter = new ExpressionUidResetter(loSplitOutput.getFilterPlan());
uidResetter.visit();
}
@Override
public void visit(LOUnion loUnion) throws FrontendException {
loUnion.resetUid();
}
@Override
public void visit(LOSort loSort) throws FrontendException {
loSort.resetUid();
List<LogicalExpressionPlan> sortPlans = loSort.getSortColPlans();
for (LogicalExpressionPlan sortPlan : sortPlans) {
ExpressionUidResetter uidResetter = new ExpressionUidResetter(sortPlan);
uidResetter.visit();
}
}
@Override
public void visit(LORank loRank) throws FrontendException {
loRank.resetUid();
List<LogicalExpressionPlan> rankPlans = loRank.getRankColPlans();
for (LogicalExpressionPlan rankPlan : rankPlans) {
ExpressionUidResetter uidResetter = new ExpressionUidResetter(rankPlan);
uidResetter.visit();
}
}
@Override
public void visit(LODistinct loDistinct) throws FrontendException {
loDistinct.resetUid();
}
@Override
public void visit(LOLimit loLimit) throws FrontendException {
loLimit.resetUid();
if (loLimit.getLimitPlan() != null) {
ExpressionUidResetter uidResetter = new ExpressionUidResetter(
loLimit.getLimitPlan());
uidResetter.visit();
}
}
@Override
public void visit(LOCross loCross) throws FrontendException {
loCross.resetUid();
}
@Override
public void visit(LOStream loStream) throws FrontendException {
loStream.resetUid();
}
}
class ExpressionUidResetter extends AllSameExpressionVisitor {
protected ExpressionUidResetter(OperatorPlan p) throws FrontendException {
super(p, new ReverseDependencyOrderWalker(p));
}
@Override
protected void execute(LogicalExpression op) throws FrontendException {
op.resetUid();
}
}