com.hazelcast.org.apache.calcite.rel.rules.TransformationRule 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 com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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;
import com.hazelcast.org.apache.calcite.plan.hep.HepPlanner;
import com.hazelcast.org.apache.calcite.plan.volcano.VolcanoPlanner;
import com.hazelcast.org.apache.calcite.rel.PhysicalNode;
/**
* Logical transformation rule, only logical operator can be rule operand,
* and only generate logical alternatives. It is only visible to
* {@link VolcanoPlanner}, {@link HepPlanner} will ignore this interface.
* That means, in {@link HepPlanner}, the rule that implements
* {@link TransformationRule} can still match with physical operator of
* {@link PhysicalNode} and generate physical alternatives.
*
* But in {@link VolcanoPlanner}, {@link TransformationRule} doesn't match
* with physical operator that implements {@link PhysicalNode}. It is not
* allowed to generate physical operators in {@link TransformationRule},
* unless you are using it in {@link HepPlanner}.
*
* @see VolcanoPlanner
* @see SubstitutionRule
*/
public interface TransformationRule {
}