com.hazelcast.org.apache.calcite.rel.rules.SubstitutionRule Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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 com.hazelcast.org.apache.calcite.rel.rules;
/**
* A rule that implements this interface indicates that the new RelNode
* is typically better than the old one. All the substitution rules will
* be executed first until they are done. The execution order of
* substitution rules depends on the match order.
*/
public interface SubstitutionRule extends TransformationRule {
/**
* Whether the planner should automatically prune old node when
* there is at least 1 equivalent rel generated by the rule.
*
* Default is false, the user needs to prune the old node
* manually in the rule.
*/
default boolean autoPruneOld() {
return false;
}
}
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