/**
* 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.drill.exec.planner.physical.visitor;
import java.util.Collections;
import org.apache.drill.exec.planner.physical.ComplexToJsonPrel;
import org.apache.drill.exec.planner.physical.Prel;
import org.apache.drill.exec.planner.physical.ScreenPrel;
import org.apache.calcite.rel.RelNode;
public class ComplexToJsonPrelVisitor extends BasePrelVisitor<Prel, Void, RuntimeException> {
private static final ComplexToJsonPrelVisitor INSTANCE = new ComplexToJsonPrelVisitor();
public static Prel addComplexToJsonPrel(Prel prel) {
return prel.accept(INSTANCE, null);
}
@Override
public Prel visitScreen(ScreenPrel prel, Void value) throws RuntimeException {
return prel.copy(prel.getTraitSet(), Collections.singletonList((RelNode)new ComplexToJsonPrel((Prel)prel.getInput())));
}
}