/*
* 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.dag;
import org.apache.flink.api.common.operators.util.FieldSet;
import org.apache.flink.optimizer.DataStatistics;
import org.apache.flink.optimizer.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();
}
}