/*
* 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 com.facebook.presto.sql.planner.iterative;
import com.facebook.presto.sql.planner.plan.PlanNode;
public interface Lookup
{
/**
* Resolves a node by materializing GroupReference nodes
* representing symbolic references to other nodes.
*
* If the node is not a GroupReference, it returns the
* argument as is.
*/
PlanNode resolve(PlanNode node);
}