| /* |
| * 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 org.apache.drill.exec.planner.physical.explain; |
| |
| import java.io.PrintWriter; |
| import java.io.StringWriter; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Queue; |
| |
| import org.apache.drill.exec.planner.physical.ExchangePrel; |
| import org.apache.drill.exec.planner.physical.Prel; |
| import org.apache.drill.exec.planner.physical.visitor.BasePrelVisitor; |
| import org.apache.calcite.rel.RelWriter; |
| import org.apache.calcite.sql.SqlExplainLevel; |
| |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Maps; |
| |
| public class PrelSequencer extends BasePrelVisitor<Void, PrelSequencer.Frag, RuntimeException> { |
| |
| private List<Frag> frags = Lists.newLinkedList(); |
| |
| public static String printWithIds(final Prel rel, SqlExplainLevel explainlevel) { |
| if (rel == null) { |
| return null; |
| } |
| final StringWriter sw = new StringWriter(); |
| final RelWriter planWriter = new NumberingRelWriter(getIdMap(rel), new PrintWriter(sw), explainlevel); |
| rel.explain(planWriter); |
| return sw.toString(); |
| |
| } |
| |
| public static Map<Prel, OpId> getIdMap(Prel rel) { |
| PrelSequencer s = new PrelSequencer(); |
| return s.go(rel); |
| } |
| |
| static class Frag implements Iterable<Frag> { |
| Prel root; |
| int majorFragmentId; |
| final List<Frag> children = Lists.newArrayList(); |
| public Frag(Prel root) { |
| super(); |
| this.root = root; |
| } |
| |
| @Override |
| public Iterator<Frag> iterator() { |
| return children.iterator(); |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + ((children == null) ? 0 : children.hashCode()); |
| result = prime * result + majorFragmentId; |
| result = prime * result + ((root == null) ? 0 : root.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null) { |
| return false; |
| } |
| if (getClass() != obj.getClass()) { |
| return false; |
| } |
| Frag other = (Frag) obj; |
| if (children == null) { |
| if (other.children != null) { |
| return false; |
| } |
| } else if (!children.equals(other.children)) { |
| return false; |
| } |
| if (majorFragmentId != other.majorFragmentId) { |
| return false; |
| } |
| if (root == null) { |
| if (other.root != null) { |
| return false; |
| } |
| } else if (!root.equals(other.root)) { |
| return false; |
| } |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| final int maxLen = 10; |
| return "Frag [root=" + root + ", majorFragmentId=" + majorFragmentId + ", children=" |
| + (children != null ? children.subList(0, Math.min(children.size(), maxLen)) : null) + "]"; |
| } |
| |
| } |
| |
| public static class OpId{ |
| int fragmentId; |
| int opId; |
| public OpId(int fragmentId, int opId) { |
| super(); |
| this.fragmentId = fragmentId; |
| this.opId = opId; |
| } |
| |
| public int getFragmentId() { |
| return fragmentId; |
| } |
| |
| |
| public int getOpId() { |
| return opId; |
| } |
| |
| public int getAsSingleInt() { |
| return (fragmentId << 16) + opId; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + fragmentId; |
| result = prime * result + opId; |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null) { |
| return false; |
| } |
| if (getClass() != obj.getClass()) { |
| return false; |
| } |
| OpId other = (OpId) obj; |
| if (fragmentId != other.fragmentId) { |
| return false; |
| } |
| if (opId != other.opId) { |
| return false; |
| } |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return fragmentId + ":*:" + opId; |
| } |
| |
| } |
| |
| public Map<Prel, OpId> go(Prel root) { |
| |
| // get fragments. |
| Frag rootFrag = new Frag(root); |
| frags.add(rootFrag); |
| root.accept(this, rootFrag); |
| |
| // do depth first traversal of fragments to assign major fragment ids. |
| Queue<Frag> q = Lists.newLinkedList(); |
| |
| q.add(rootFrag); |
| int majorFragmentId = 0; |
| while (!q.isEmpty()) { |
| Frag frag = q.remove(); |
| |
| frag.majorFragmentId = majorFragmentId++; |
| |
| for (Frag child : frag) { |
| q.add(child); |
| } |
| } |
| |
| // for each fragment, do a dfs of operators to assign operator ids. |
| Map<Prel, OpId> ids = Maps.newIdentityHashMap(); |
| |
| ids.put(rootFrag.root, new OpId(0, 0)); |
| for (Frag f : frags) { |
| int id = 1; |
| Queue<Prel> ops = Lists.newLinkedList(); |
| ops.add(f.root); |
| while (!ops.isEmpty()) { |
| Prel p = ops.remove(); |
| boolean isExchange = p instanceof ExchangePrel; |
| |
| if (p != f.root) { // we account for exchanges as receviers to guarantee unique identifiers. |
| ids.put(p, new OpId(f.majorFragmentId, id++) ); |
| } |
| |
| if (!isExchange || p == f.root) { |
| List<Prel> children = Lists.reverse(Lists.newArrayList(p.iterator())); |
| for (Prel child : children) { |
| ops.add(child); |
| } |
| } |
| } |
| } |
| |
| |
| return ids; |
| } |
| |
| @Override |
| public Void visitExchange(ExchangePrel prel, Frag value) throws RuntimeException { |
| Frag newFrag = new Frag(prel); |
| frags.add(newFrag); |
| value.children.add(newFrag); |
| for (Prel child : prel) { |
| child.accept(this, newFrag); |
| } |
| |
| return null; |
| } |
| |
| @Override |
| public Void visitPrel(Prel prel, Frag value) throws RuntimeException { |
| for (Prel children : prel) { |
| children.accept(this, value); |
| } |
| return null; |
| } |
| |
| } |