com.facebook.presto.spi.ConnectorPlanOptimizer Maven / Gradle / Ivy
/*
* 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.spi;
import com.facebook.presto.spi.plan.PlanNode;
import com.facebook.presto.spi.plan.PlanNodeIdAllocator;
/**
* Given a PlanNode, return a transformed PlanNode.
*
* The given {@param maxSubplan} is a highest PlanNode in the query plan, such that
* (1) it is a PlanNode implementation in SPI (i.e., not an internal PlanNode), and
* (2) all the TableScanNodes that are reachable from {@param maxSubplan} are from the current connector.
*
* There could be multiple PlanNodes satisfying the above conditions.
* All of them will be processed with the given implementation of ConnectorPlanOptimizer.
* Each optimization is processed exactly once at the end of logical planning (i.e. right before AddExchanges).
*/
public interface ConnectorPlanOptimizer
{
PlanNode optimize(
PlanNode maxSubplan,
ConnectorSession session,
VariableAllocator variableAllocator,
PlanNodeIdAllocator idAllocator);
}