/*
* 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.flink.optimizer.operators;
import org.apache.flink.optimizer.dataproperties.LocalProperties;
import org.apache.flink.runtime.operators.DriverStrategy;
public class CrossStreamOuterFirstDescriptor extends CartesianProductDescriptor {
public CrossStreamOuterFirstDescriptor() {
this(true, true);
}
public CrossStreamOuterFirstDescriptor(boolean allowBroadcastFirst, boolean allowBroadcastSecond) {
super(allowBroadcastFirst, allowBroadcastSecond);
}
@Override
public DriverStrategy getStrategy() {
return DriverStrategy.NESTEDLOOP_STREAMED_OUTER_FIRST;
}
@Override
public LocalProperties computeLocalProperties(LocalProperties in1, LocalProperties in2) {
// uniqueness becomes grouping with streamed nested loops
if ((in1.getGroupedFields() == null || in1.getGroupedFields().size() == 0) &&
in1.getUniqueFields() != null && in1.getUniqueFields().size() > 0)
{
return LocalProperties.forGrouping(in1.getUniqueFields().iterator().next().toFieldList());
} else {
return in1.clearUniqueFieldSets();
}
}
}