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/*
 * 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 No Operation 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();
    }
}