io.trino.sql.planner.iterative.rule.Rules 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.iterative.rule;
import io.trino.Session;
import io.trino.cost.PlanNodeStatsEstimate;
import io.trino.cost.StatsProvider;
import io.trino.sql.planner.plan.PlanNode;
import java.util.Optional;
import static io.trino.SystemSessionProperties.isStatisticsPrecalculationForPushdownEnabled;
public final class Rules
{
private Rules() {}
public static Optional deriveTableStatisticsForPushdown(
StatsProvider statsProvider,
Session session,
boolean precalculateStatistics,
PlanNode oldTableScanParent)
{
if (!precalculateStatistics || !isStatisticsPrecalculationForPushdownEnabled(session)) {
return Optional.empty();
}
PlanNodeStatsEstimate statistics = statsProvider.getStats(oldTableScanParent);
return Optional.of(statistics);
}
}