/*
* 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.compiler.dag;
import java.util.Collections;
import java.util.List;
import org.apache.flink.api.common.operators.Ordering;
import org.apache.flink.api.common.operators.base.CoGroupOperatorBase;
import org.apache.flink.compiler.DataStatistics;
import org.apache.flink.compiler.operators.CoGroupDescriptor;
import org.apache.flink.compiler.operators.CoGroupWithSolutionSetFirstDescriptor;
import org.apache.flink.compiler.operators.CoGroupWithSolutionSetSecondDescriptor;
import org.apache.flink.compiler.operators.OperatorDescriptorDual;
/**
* The Optimizer representation of a <i>CoGroup</i> operator.
*/
public class CoGroupNode extends TwoInputNode {
private List<OperatorDescriptorDual> dataProperties;
public CoGroupNode(CoGroupOperatorBase<?, ?, ?, ?> pactContract) {
super(pactContract);
this.dataProperties = initializeDataProperties();
}
// --------------------------------------------------------------------------------------------
/**
* 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() {
return this.dataProperties;
}
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.dataProperties = Collections.<OperatorDescriptorDual>singletonList(op);
}
@Override
protected void computeOperatorSpecificDefaultEstimates(DataStatistics statistics) {
// for CoGroup, we currently make no reasonable default estimates
}
private List<OperatorDescriptorDual> initializeDataProperties() {
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;
}
return Collections.<OperatorDescriptorDual>singletonList(new CoGroupDescriptor(this.keys1, this.keys2, groupOrder1, groupOrder2));
}
}