io.trino.sql.planner.iterative.rule.PruneIntersectSourceColumns 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 com.google.common.collect.ImmutableSet;
import io.trino.matching.Captures;
import io.trino.matching.Pattern;
import io.trino.sql.planner.Symbol;
import io.trino.sql.planner.iterative.Rule;
import io.trino.sql.planner.plan.IntersectNode;
import java.util.Set;
import static io.trino.sql.planner.iterative.rule.Util.restrictChildOutputs;
import static io.trino.sql.planner.plan.Patterns.intersect;
public class PruneIntersectSourceColumns
implements Rule
{
@Override
public Pattern getPattern()
{
return intersect();
}
@Override
public Result apply(IntersectNode node, Captures captures, Context context)
{
@SuppressWarnings("unchecked")
Set[] referencedInputs = new Set[node.getSources().size()];
for (int i = 0; i < node.getSources().size(); i++) {
referencedInputs[i] = ImmutableSet.copyOf(node.sourceOutputLayout(i));
}
return restrictChildOutputs(context.getIdAllocator(), node, referencedInputs)
.map(Rule.Result::ofPlanNode)
.orElse(Rule.Result.empty());
}
}