/***********************************************************************************************************************
* 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.operators;
import java.util.ArrayList;
import java.util.List;
import eu.stratosphere.api.common.operators.util.FieldList;
import eu.stratosphere.compiler.dataproperties.GlobalProperties;
import eu.stratosphere.compiler.dataproperties.PartitioningProperty;
import eu.stratosphere.compiler.dataproperties.RequestedGlobalProperties;
public abstract class AbstractJoinDescriptor extends OperatorDescriptorDual {
protected AbstractJoinDescriptor(FieldList keys1, FieldList keys2) {
super(keys1, keys2);
}
@Override
protected List<GlobalPropertiesPair> createPossibleGlobalProperties() {
ArrayList<GlobalPropertiesPair> pairs = new ArrayList<GlobalPropertiesPair>();
{ // partition both (hash)
RequestedGlobalProperties partitioned1 = new RequestedGlobalProperties();
partitioned1.setHashPartitioned(this.keys1);
RequestedGlobalProperties partitioned2 = new RequestedGlobalProperties();
partitioned2.setHashPartitioned(this.keys2);
pairs.add(new GlobalPropertiesPair(partitioned1, partitioned2));
}
{ // replicate second
RequestedGlobalProperties any1 = new RequestedGlobalProperties();
RequestedGlobalProperties replicated2 = new RequestedGlobalProperties();
replicated2.setFullyReplicated();
pairs.add(new GlobalPropertiesPair(any1, replicated2));
}
{ // replicate first
RequestedGlobalProperties replicated1 = new RequestedGlobalProperties();
replicated1.setFullyReplicated();
RequestedGlobalProperties any2 = new RequestedGlobalProperties();
pairs.add(new GlobalPropertiesPair(replicated1, any2));
}
return pairs;
}
@Override
public GlobalProperties computeGlobalProperties(GlobalProperties in1, GlobalProperties in2) {
GlobalProperties gp = GlobalProperties.combine(in1, in2);
if (gp.getUniqueFieldCombination() != null && gp.getUniqueFieldCombination().size() > 0 &&
gp.getPartitioning() == PartitioningProperty.RANDOM)
{
gp.setAnyPartitioning(gp.getUniqueFieldCombination().iterator().next().toFieldList());
}
gp.clearUniqueFieldCombinations();
return gp;
}
}