com.hazelcast.org.apache.calcite.plan.hep.HepRuleCall Maven / Gradle / Ivy
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* 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.plan.hep;
import com.hazelcast.org.apache.calcite.plan.RelHintsPropagator;
import com.hazelcast.org.apache.calcite.plan.RelOptPlanner;
import com.hazelcast.org.apache.calcite.plan.RelOptRuleCall;
import com.hazelcast.org.apache.calcite.plan.RelOptRuleOperand;
import com.hazelcast.org.apache.calcite.plan.RelOptUtil;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* HepRuleCall implements {@link RelOptRuleCall} for a {@link HepPlanner}. It
* remembers transformation results so that the planner can choose which one (if
* any) should replace the original expression.
*/
public class HepRuleCall extends RelOptRuleCall {
//~ Instance fields --------------------------------------------------------
private List results;
//~ Constructors -----------------------------------------------------------
HepRuleCall(
RelOptPlanner planner,
RelOptRuleOperand operand,
RelNode[] rels,
Map> nodeChildren,
@Nullable List parents) {
super(planner, operand, rels, nodeChildren, parents);
results = new ArrayList<>();
}
//~ Methods ----------------------------------------------------------------
@Override public void transformTo(RelNode rel, Map equiv,
RelHintsPropagator handler) {
final RelNode rel0 = rels[0];
RelOptUtil.verifyTypeEquivalence(rel0, rel, rel0);
rel = handler.propagate(rel0, rel);
results.add(rel);
rel0.getCluster().invalidateMetadataQuery();
}
List getResults() {
return results;
}
}
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