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.iterative.Lookup;
import io.trino.sql.planner.plan.PlanNode;
import static java.util.Objects.requireNonNull;
public interface StatsCalculator
{
/**
* Calculate stats for the {@code node}.
*
* @param node The node to compute stats for.
* @param context The context required to calculate stats.
*/
PlanNodeStatsEstimate calculateStats(PlanNode node, Context context);
static StatsCalculator noopStatsCalculator()
{
return (node, context) -> PlanNodeStatsEstimate.unknown();
}
record Context(
StatsProvider statsProvider,
Lookup lookup,
Session session,
TableStatsProvider tableStatsProvider,
RuntimeInfoProvider runtimeInfoProvider)
{
public Context
{
requireNonNull(statsProvider, "statsProvider is null");
requireNonNull(lookup, "lookup is null");
requireNonNull(session, "session is null");
requireNonNull(tableStatsProvider, "tableStatsProvider is null");
requireNonNull(runtimeInfoProvider, "runtimeInfoProvider is null");
}
}
}