io.trino.cost.SemiJoinStatsRule 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.cost.ComposableStatsCalculator.Rule;
import io.trino.matching.Pattern;
import io.trino.sql.planner.TypeProvider;
import io.trino.sql.planner.iterative.Lookup;
import io.trino.sql.planner.plan.SemiJoinNode;
import java.util.Optional;
import static io.trino.sql.planner.plan.Patterns.semiJoin;
public class SemiJoinStatsRule
implements Rule
{
private static final Pattern PATTERN = semiJoin();
@Override
public Pattern getPattern()
{
return PATTERN;
}
@Override
public Optional calculate(SemiJoinNode node, StatsProvider statsProvider, Lookup lookup, Session session, TypeProvider types, TableStatsProvider tableStatsProvider)
{
PlanNodeStatsEstimate sourceStats = statsProvider.getStats(node.getSource());
// For now we just propagate statistics for source symbols.
// Handling semiJoinOutput symbols requires support for correlation for boolean columns.
return Optional.of(sourceStats);
}
}