io.trino.sql.planner.iterative.rule.PruneJoinColumns 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.sql.planner.Symbol;
import io.trino.sql.planner.plan.JoinNode;
import io.trino.sql.planner.plan.PlanNode;
import java.util.Optional;
import java.util.Set;
import static io.trino.sql.planner.plan.Patterns.join;
import static io.trino.util.MoreLists.filteredCopy;
/**
* Joins support output symbol selection, so absorb any project-off into the node.
*/
public class PruneJoinColumns
extends ProjectOffPushDownRule
{
public PruneJoinColumns()
{
super(join());
}
@Override
protected Optional pushDownProjectOff(Context context, JoinNode joinNode, Set referencedOutputs)
{
return Optional.of(
new JoinNode(
joinNode.getId(),
joinNode.getType(),
joinNode.getLeft(),
joinNode.getRight(),
joinNode.getCriteria(),
filteredCopy(joinNode.getLeftOutputSymbols(), referencedOutputs::contains),
filteredCopy(joinNode.getRightOutputSymbols(), referencedOutputs::contains),
joinNode.isMaySkipOutputDuplicates(),
joinNode.getFilter(),
joinNode.getLeftHashSymbol(),
joinNode.getRightHashSymbol(),
joinNode.getDistributionType(),
joinNode.isSpillable(),
joinNode.getDynamicFilters(),
joinNode.getReorderJoinStatsAndCost()));
}
}