/*
* 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.backend.hadoop.executionengine.physicalLayer.relationalOperators;
import java.util.Iterator;
import java.util.List;
import org.apache.pig.PigException;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.POStatus;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.Result;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhyPlanVisitor;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.DataType;
import org.apache.pig.data.ReadOnceBag;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.io.NullableTuple;
import org.apache.pig.impl.plan.NodeIdGenerator;
import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.impl.plan.VisitorException;
/**
* This package operator is a specialization
* of POPackage operator used for the specific
* case of the order by query. See JIRA 802
* for more details.
*/
public class POPackageLite extends POPackage {
/**
*
*/
private static final long serialVersionUID = 1L;
public POPackageLite(OperatorKey k) {
super(k, -1, null);
}
public POPackageLite(OperatorKey k, int rp) {
super(k, rp, null);
}
public POPackageLite(OperatorKey k, List<PhysicalOperator> inp) {
super(k, -1, inp);
}
public POPackageLite(OperatorKey k, int rp, List<PhysicalOperator> inp) {
super(k, rp, inp);
}
/* (non-Javadoc)
* @see org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPackage#setNumInps(int)
*/
@Override
public void setNumInps(int numInps) {
if(numInps != 1)
{
throw new RuntimeException("POPackageLite can only take 1 input");
}
this.numInputs = numInps;
}
public boolean[] getInner() {
throw new RuntimeException("POPackageLite does not support getInner operation");
}
public void setInner(boolean[] inner) {
throw new RuntimeException("POPackageLite does not support setInner operation");
}
/**
* Make a deep copy of this operator.
* @throws CloneNotSupportedException
*/
@Override
public POPackageLite clone() throws CloneNotSupportedException {
POPackageLite clone = (POPackageLite)super.clone();
clone.inner = null;
return clone;
}
/**
* @return the distinct
*/
@Override
public boolean isDistinct() {
throw new RuntimeException("POPackageLite does not support isDistinct operation");
}
/**
* @param distinct the distinct to set
*/
@Override
public void setDistinct(boolean distinct) {
throw new RuntimeException("POPackageLite does not support setDistinct operation");
}
/**
* @return the isKeyTuple
*/
public boolean getKeyTuple() {
return isKeyTuple;
}
/**
* @return the keyAsTuple
*/
public Tuple getKeyAsTuple() {
return keyAsTuple;
}
/**
* @return the tupIter
*/
public Iterator<NullableTuple> getTupIter() {
return tupIter;
}
/**
* @return the key
*/
public Object getKey() {
return key;
}
/**
* Similar to POPackage.getNext except that
* only one input is expected with index 0
* and ReadOnceBag is used instead of
* DefaultDataBag.
*/
@Override
public Result getNext(Tuple t) throws ExecException {
Tuple res;
//Create numInputs bags
ReadOnceBag db = null;
db = new ReadOnceBag(this, tupIter, key);
if(reporter!=null) reporter.progress();
//Construct the output tuple by appending
//the key and all the above constructed bags
//and return it.
res = mTupleFactory.newTuple(numInputs+1);
res.set(0,key);
res.set(1,db);
detachInput();
Result r = new Result();
r.result = res;
r.returnStatus = POStatus.STATUS_OK;
return r;
}
/**
* Makes use of the superclass method, but this requires
* an additional parameter key passed by ReadOnceBag.
* key of this instance will be set to null in detachInput
* call, but an instance of ReadOnceBag may have the original
* key that it uses. Therefore this extra argument is taken
* to temporarily set it before the call to the superclass method
* and then restore it.
*/
public Tuple getValueTuple(NullableTuple ntup, int index, Object key) throws ExecException {
Object origKey = this.key;
this.key = key;
Tuple retTuple = super.getValueTuple(ntup, index);
this.key = origKey;
return retTuple;
}
}