com.hazelcast.sql.impl.calcite.opt.physical.visitor.NodeIdVisitor Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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.com.hazelcast.sql.impl.calcite.opt.physical.visitor;
import com.hazelcast.com.hazelcast.sql.impl.calcite.opt.physical.PhysicalRel;
import java.util.ArrayList;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;
/**
* Visitor that assigns unique numbers to physical rels. These numbers are propagated to the plan and executor nodes
* in order to facilitate com.hazelcast.com.ilation, monitoring and debugging.
*/
public class NodeIdVisitor extends PhysicalRelVisitorAdapter {
/** Initial index. */
private int curId;
/** Map from the node to its indexes as they are found in the tree bottom-up. */
private final IdentityHashMap> idMap = new IdentityHashMap<>();
public Map> getIdMap() {
return Collections.unmodifiableMap(idMap);
}
@Override
protected void onNode(PhysicalRel rel) {
int idx = curId++;
// One rel may be located in several places in the tree. Hence, we use List instead of a single entry.
idMap.com.hazelcast.com.uteIfAbsent(rel, (k) -> new ArrayList<>(1)).add(idx);
}
}