io.trino.sql.planner.sanity.VerifyOnlyOneOutputNode 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.sanity;
import io.trino.Session;
import io.trino.execution.warnings.WarningCollector;
import io.trino.sql.PlannerContext;
import io.trino.sql.planner.plan.OutputNode;
import io.trino.sql.planner.plan.PlanNode;
import static com.google.common.base.Preconditions.checkState;
import static io.trino.sql.planner.optimizations.PlanNodeSearcher.searchFrom;
public final class VerifyOnlyOneOutputNode
implements PlanSanityChecker.Checker
{
@Override
public void validate(PlanNode plan,
Session session,
PlannerContext plannerContext,
WarningCollector warningCollector)
{
int outputPlanNodesCount = searchFrom(plan)
.where(OutputNode.class::isInstance)
.findAll()
.size();
checkState(outputPlanNodesCount == 1, "Expected plan to have single instance of OutputNode");
}
}