io.trino.sql.planner.iterative.rule.OptimizeRowPattern 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.matching.Captures;
import io.trino.matching.Pattern;
import io.trino.sql.planner.iterative.Rule;
import io.trino.sql.planner.plan.PatternRecognitionNode;
import io.trino.sql.planner.rowpattern.IrPatternAlternationOptimizer;
import io.trino.sql.planner.rowpattern.IrRowPatternFlattener;
import io.trino.sql.planner.rowpattern.ir.IrRowPattern;
import static io.trino.sql.planner.plan.Patterns.patternRecognition;
public class OptimizeRowPattern
implements Rule
{
private static final Pattern PATTERN = patternRecognition();
@Override
public Pattern getPattern()
{
return PATTERN;
}
@Override
public Result apply(PatternRecognitionNode node, Captures captures, Context context)
{
IrRowPattern optimizedPattern = IrPatternAlternationOptimizer.optimize(IrRowPatternFlattener.optimize(node.getPattern()));
if (optimizedPattern.equals(node.getPattern())) {
return Result.empty();
}
return Result.ofPlanNode(new PatternRecognitionNode(
node.getId(),
node.getSource(),
node.getSpecification(),
node.getHashSymbol(),
node.getPrePartitionedInputs(),
node.getPreSortedOrderPrefix(),
node.getWindowFunctions(),
node.getMeasures(),
node.getCommonBaseFrame(),
node.getRowsPerMatch(),
node.getSkipToLabels(),
node.getSkipToPosition(),
node.isInitial(),
optimizedPattern,
node.getVariableDefinitions()));
}
}