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Rule.java
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Rule.java
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/*
* 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;
import io.trino.Session;
import io.trino.cost.CostProvider;
import io.trino.cost.StatsProvider;
import io.trino.execution.warnings.WarningCollector;
import io.trino.matching.Captures;
import io.trino.matching.Pattern;
import io.trino.sql.planner.PlanNodeIdAllocator;
import io.trino.sql.planner.SymbolAllocator;
import io.trino.sql.planner.plan.PlanNode;
import java.util.Optional;
import static java.util.Objects.requireNonNull;
public interface Rule<T>
{
/**
* Returns a pattern to which plan nodes this rule applies.
*/
Pattern<T> getPattern();
default boolean isEnabled(Session session)
{
return true;
}
Result apply(T node, Captures captures, Context context);
interface Context
{
Lookup getLookup();
PlanNodeIdAllocator getIdAllocator();
SymbolAllocator getSymbolAllocator();
Session getSession();
StatsProvider getStatsProvider();
CostProvider getCostProvider();
void checkTimeoutNotExhausted();
WarningCollector getWarningCollector();
}
final class Result
{
public static Result empty()
{
return new Result(Optional.empty());
}
public static Result ofPlanNode(PlanNode transformedPlan)
{
return new Result(Optional.of(transformedPlan));
}
private final Optional<PlanNode> transformedPlan;
private Result(Optional<PlanNode> transformedPlan)
{
this.transformedPlan = requireNonNull(transformedPlan, "transformedPlan is null");
}
public Optional<PlanNode> getTransformedPlan()
{
return transformedPlan;
}
public boolean isEmpty()
{
return transformedPlan.isEmpty();
}
}
}