/***********************************************************************************************************************
* 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 eu.stratosphere.compiler.dataproperties.LocalProperties;
import eu.stratosphere.pact.runtime.task.DriverStrategy;
/**
*
*/
public class CrossStreamOuterSecondDescriptor extends CartesianProductDescriptor {
public CrossStreamOuterSecondDescriptor() {
this(true, true);
}
public CrossStreamOuterSecondDescriptor(boolean allowBroadcastFirst, boolean allowBroadcastSecond) {
super(allowBroadcastFirst, allowBroadcastSecond);
}
@Override
public DriverStrategy getStrategy() {
return DriverStrategy.NESTEDLOOP_STREAMED_OUTER_SECOND;
}
@Override
public LocalProperties computeLocalProperties(LocalProperties in1, LocalProperties in2) {
// uniqueness becomes grouping with streamed nested loops
if ((in2.getGroupedFields() == null || in2.getGroupedFields().size() == 0) &&
in2.getUniqueFields() != null && in2.getUniqueFields().size() > 0)
{
in2.setGroupedFields(in2.getUniqueFields().iterator().next().toFieldList());
}
in2.clearUniqueFieldSets();
return in2;
}
}