/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* Licensed 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 eu.stratosphere.compiler.dag;
import java.util.ArrayList;
import java.util.List;
import eu.stratosphere.api.common.operators.Ordering;
import eu.stratosphere.api.common.operators.base.CoGroupOperatorBase;
import eu.stratosphere.compiler.DataStatistics;
import eu.stratosphere.compiler.operators.CoGroupDescriptor;
import eu.stratosphere.compiler.operators.CoGroupWithSolutionSetFirstDescriptor;
import eu.stratosphere.compiler.operators.CoGroupWithSolutionSetSecondDescriptor;
import eu.stratosphere.compiler.operators.OperatorDescriptorDual;
/**
* The Optimizer representation of a <i>CoGroup</i> operator.
*/
public class CoGroupNode extends TwoInputNode {
public CoGroupNode(CoGroupOperatorBase<?, ?, ?, ?> pactContract) {
super(pactContract);
}
// --------------------------------------------------------------------------------------------
/**
* Gets the operator for this CoGroup node.
*
* @return The CoGroup operator.
*/
@Override
public CoGroupOperatorBase<?, ?, ?, ?> getPactContract() {
return (CoGroupOperatorBase<?, ?, ?, ?>) super.getPactContract();
}
@Override
public String getName() {
return "CoGroup";
}
@Override
protected List<OperatorDescriptorDual> getPossibleProperties() {
Ordering groupOrder1 = null;
Ordering groupOrder2 = null;
CoGroupOperatorBase<?, ?, ?, ?> cgc = getPactContract();
groupOrder1 = cgc.getGroupOrderForInputOne();
groupOrder2 = cgc.getGroupOrderForInputTwo();
if (groupOrder1 != null && groupOrder1.getNumberOfFields() == 0) {
groupOrder1 = null;
}
if (groupOrder2 != null && groupOrder2.getNumberOfFields() == 0) {
groupOrder2 = null;
}
List<OperatorDescriptorDual> l = new ArrayList<OperatorDescriptorDual>(1);
l.add(new CoGroupDescriptor(this.keys1, this.keys2, groupOrder1, groupOrder2));
return l;
}
public void makeCoGroupWithSolutionSet(int solutionsetInputIndex) {
OperatorDescriptorDual op;
if (solutionsetInputIndex == 0) {
op = new CoGroupWithSolutionSetFirstDescriptor(keys1, keys2);
} else if (solutionsetInputIndex == 1) {
op = new CoGroupWithSolutionSetSecondDescriptor(keys1, keys2);
} else {
throw new IllegalArgumentException();
}
this.possibleProperties.clear();
this.possibleProperties.add(op);
}
@Override
protected void computeOperatorSpecificDefaultEstimates(DataStatistics statistics) {
// for CoGroup, we currently make no reasonable default estimates
}
}