io.trino.sql.planner.SchedulingOrderVisitor 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 io.trino.sql.planner;
import com.google.common.collect.ImmutableList;
import io.trino.sql.planner.plan.PlanNode;
import io.trino.sql.planner.plan.PlanNodeId;
import io.trino.sql.planner.plan.TableFunctionProcessorNode;
import io.trino.sql.planner.plan.TableScanNode;
import java.util.List;
import java.util.function.Consumer;
import static java.util.Objects.requireNonNull;
public final class SchedulingOrderVisitor
{
public static List scheduleOrder(PlanNode root)
{
ImmutableList.Builder schedulingOrder = ImmutableList.builder();
root.accept(new Visitor(schedulingOrder::add), null);
return schedulingOrder.build();
}
private SchedulingOrderVisitor() {}
private static class Visitor
extends BuildSideJoinPlanVisitor
{
private final Consumer schedulingOrder;
public Visitor(Consumer schedulingOrder)
{
this.schedulingOrder = requireNonNull(schedulingOrder, "schedulingOrder is null");
}
@Override
public Void visitTableScan(TableScanNode node, Void context)
{
schedulingOrder.accept(node.getId());
return null;
}
@Override
public Void visitTableFunctionProcessor(TableFunctionProcessorNode node, Void context)
{
if (node.getSource().isEmpty()) {
schedulingOrder.accept(node.getId());
}
else {
node.getSource().orElseThrow().accept(this, context);
}
return null;
}
}
}