io.trino.sql.planner.iterative.rule.RemoveAggregationInSemiJoin 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.ImmutableList;
import io.trino.matching.Capture;
import io.trino.matching.Captures;
import io.trino.matching.Pattern;
import io.trino.sql.planner.iterative.Rule;
import io.trino.sql.planner.plan.AggregationNode;
import io.trino.sql.planner.plan.SemiJoinNode;
import static com.google.common.collect.Iterables.getOnlyElement;
import static io.trino.matching.Capture.newCapture;
import static io.trino.sql.planner.plan.Patterns.SemiJoin.getFilteringSource;
import static io.trino.sql.planner.plan.Patterns.aggregation;
import static io.trino.sql.planner.plan.Patterns.semiJoin;
/**
* Remove the aggregation node that produces distinct rows from the Filtering source of a Semi join.
*/
public class RemoveAggregationInSemiJoin
implements Rule
{
private static final Capture CHILD = newCapture();
private static final Pattern PATTERN = semiJoin()
.with(getFilteringSource()
.matching(aggregation()
.capturedAs(CHILD).matching(AggregationNode::producesDistinctRows)));
@Override
public Pattern getPattern()
{
return PATTERN;
}
@Override
public Result apply(SemiJoinNode semiJoinNode, Captures captures, Context context)
{
AggregationNode filteringSource = captures.get(CHILD);
return Result.ofPlanNode(semiJoinNode
.replaceChildren(ImmutableList.of(semiJoinNode.getSource(), getOnlyElement(filteringSource.getSources()))));
}
}