/***********************************************************************************************************************
* 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 eu.stratosphere.api.common.operators.util.FieldSet;
import eu.stratosphere.compiler.DataStatistics;
import eu.stratosphere.compiler.operators.NoOpDescriptor;
/**
* The optimizer's internal representation of a <i>No Operation</i> node.
*/
public class NoOpNode extends UnaryOperatorNode {
public NoOpNode() {
super("No Op", new FieldSet(), new NoOpDescriptor());
}
public NoOpNode(String name) {
super(name, new FieldSet(), new NoOpDescriptor());
}
@Override
protected void computeOperatorSpecificDefaultEstimates(DataStatistics statistics) {
this.estimatedNumRecords = getPredecessorNode().getEstimatedNumRecords();
this.estimatedOutputSize = getPredecessorNode().getEstimatedOutputSize();
}
}