io.trino.cost.StatsCalculator 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.cost;
import io.trino.Session;
import io.trino.sql.planner.TypeProvider;
import io.trino.sql.planner.iterative.IterativeOptimizer;
import io.trino.sql.planner.iterative.Lookup;
import io.trino.sql.planner.plan.PlanNode;
public interface StatsCalculator
{
/**
* Calculate stats for the {@code node}.
*
* @param node The node to compute stats for.
* @param sourceStats The stats provider for any child nodes' stats, if needed to compute stats for the {@code node}
* @param lookup Lookup to be used when resolving source nodes, allowing stats calculation to work within {@link IterativeOptimizer}
* @param types The type provider for all symbols in the scope.
* @param tableStatsProvider The table stats provider.
*/
PlanNodeStatsEstimate calculateStats(
PlanNode node,
StatsProvider sourceStats,
Lookup lookup,
Session session,
TypeProvider types,
TableStatsProvider tableStatsProvider);
static StatsCalculator noopStatsCalculator()
{
return (node, sourceStats, lookup, ignore, types, tableStatsProvider) -> PlanNodeStatsEstimate.unknown();
}
}