| /* |
| * 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.rules; |
| |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.newplan.Operator; |
| import org.apache.pig.newplan.OperatorPlan; |
| import org.apache.pig.newplan.logical.Util; |
| import org.apache.pig.newplan.logical.relational.LOFilter; |
| import org.apache.pig.newplan.logical.relational.LOForEach; |
| import org.apache.pig.newplan.logical.relational.LOJoin; |
| import org.apache.pig.newplan.logical.relational.LOSort; |
| import org.apache.pig.newplan.logical.relational.LOSplitOutput; |
| import org.apache.pig.newplan.logical.relational.LogicalPlan; |
| import org.apache.pig.newplan.logical.relational.LogicalRelationalOperator; |
| import org.apache.pig.newplan.logical.relational.LogicalSchema; |
| import org.apache.pig.newplan.optimizer.Transformer; |
| |
| public class AddForEach extends WholePlanRule { |
| |
| public AddForEach(String n) { |
| super(n, false); |
| } |
| |
| @Override |
| public Transformer getNewTransformer() { |
| return new AddForEachTransformer(); |
| } |
| |
| public class AddForEachTransformer extends Transformer { |
| LogicalRelationalOperator opForAdd; |
| |
| @Override |
| public boolean check(OperatorPlan matched) throws FrontendException { |
| Iterator<Operator> iter = matched.getOperators(); |
| while(iter.hasNext()) { |
| LogicalRelationalOperator op = (LogicalRelationalOperator)iter.next(); |
| if ((op instanceof LOFilter||op instanceof LOSort||op instanceof LOJoin|| |
| op instanceof LOSplitOutput) && shouldAdd(op)) { |
| opForAdd = op; |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| @Override |
| public OperatorPlan reportChanges() { |
| return currentPlan; |
| } |
| |
| private void addSuccessors(Operator op) throws FrontendException { |
| List<Operator> ll = op.getPlan().getSuccessors(op); |
| if (ll != null) { |
| for(Operator suc: ll) { |
| addSuccessors(suc); |
| } |
| } |
| } |
| |
| @Override |
| public void transform(OperatorPlan matched) throws FrontendException { |
| addForeach(opForAdd); |
| |
| addSuccessors(opForAdd); |
| } |
| |
| @SuppressWarnings("unchecked") |
| // check if an LOForEach should be added after the logical operator |
| private boolean shouldAdd(LogicalRelationalOperator op) throws FrontendException { |
| if (op instanceof LOForEach) { |
| return false; |
| } |
| |
| Set<Long> outputUids = (Set<Long>)op.getAnnotation(ColumnPruneHelper.OUTPUTUIDS); |
| if (outputUids==null || outputUids.size() == 0 ) |
| return false; |
| |
| LogicalSchema schema = op.getSchema(); |
| if (schema==null) |
| return false; |
| |
| // check if there is already a foreach |
| List<Operator> ll = op.getPlan().getSuccessors(op); |
| if (ll != null && ll.get(0) instanceof LOForEach) { |
| return false; |
| } |
| |
| Set<Integer> columnsToDrop = new HashSet<Integer>(); |
| |
| for (int i=0;i<schema.size();i++) { |
| if (!outputUids.contains(schema.getField(i).uid)) |
| columnsToDrop.add(i); |
| } |
| |
| if (!columnsToDrop.isEmpty()) return true; |
| |
| return false; |
| } |
| |
| @SuppressWarnings("unchecked") |
| private void addForeach(LogicalRelationalOperator op) throws FrontendException { |
| Set<Long> outputUids = (Set<Long>)op.getAnnotation(ColumnPruneHelper.OUTPUTUIDS); |
| LogicalSchema schema = op.getSchema(); |
| Set<Integer> columnsToDrop = new HashSet<Integer>(); |
| |
| for (int i=0;i<schema.size();i++) { |
| if (!outputUids.contains(schema.getField(i).uid)) |
| columnsToDrop.add(i); |
| } |
| |
| if (!columnsToDrop.isEmpty()) { |
| Util.addForEachAfter((LogicalPlan)op.getPlan(), op, 0, columnsToDrop); |
| } |
| } |
| } |
| } |