| /* |
| * 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.iotdb.db.queryengine.plan.planner.plan.node.process.join; |
| |
| import org.apache.iotdb.db.queryengine.plan.planner.plan.node.PlanNode; |
| import org.apache.iotdb.db.queryengine.plan.planner.plan.node.PlanNodeId; |
| import org.apache.iotdb.db.queryengine.plan.planner.plan.node.PlanNodeType; |
| import org.apache.iotdb.db.queryengine.plan.planner.plan.node.PlanVisitor; |
| import org.apache.iotdb.db.queryengine.plan.planner.plan.node.process.TwoChildProcessNode; |
| import org.apache.iotdb.db.queryengine.plan.statement.component.Ordering; |
| |
| import org.apache.tsfile.utils.ReadWriteIOUtils; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Objects; |
| |
| /** |
| * This node is responsible for joining two TsBlock. |
| * |
| * <p>The join algorithm is <b>left join</b> on timestamp column —— take the time column of the |
| * <b>left child</b> as the time column of the result. If a timestamp does not exist in the right |
| * child, it will be null in the corresponding row of the result. The output result is sorted by |
| * timestamp. |
| * |
| * <p>e.g. |
| * |
| * <pre> |
| * [series1] [series2] [series1 join series2] |
| * time, s1 time, s2 time, s1, s2 |
| * 1, 1 1, 1, null |
| * 2, 2 2, 2 2, 2, 2 |
| * 3, 3 |
| * </pre> |
| */ |
| public class LeftOuterTimeJoinNode extends TwoChildProcessNode { |
| |
| // This parameter indicates the order when executing multiway merge sort. |
| private final Ordering mergeOrder; |
| |
| public LeftOuterTimeJoinNode(PlanNodeId id, Ordering mergeOrder) { |
| super(id); |
| this.mergeOrder = mergeOrder; |
| } |
| |
| public LeftOuterTimeJoinNode( |
| PlanNodeId id, Ordering mergeOrder, PlanNode leftChild, PlanNode rightChild) { |
| super(id, leftChild, rightChild); |
| this.mergeOrder = mergeOrder; |
| } |
| |
| public Ordering getMergeOrder() { |
| return mergeOrder; |
| } |
| |
| @Override |
| public PlanNode clone() { |
| return new LeftOuterTimeJoinNode(getPlanNodeId(), getMergeOrder()); |
| } |
| |
| @Override |
| public List<String> getOutputColumnNames() { |
| List<String> outputColumnNames = new ArrayList<>(); |
| outputColumnNames.addAll(leftChild.getOutputColumnNames()); |
| outputColumnNames.addAll(rightChild.getOutputColumnNames()); |
| return outputColumnNames; |
| } |
| |
| @Override |
| public <R, C> R accept(PlanVisitor<R, C> visitor, C context) { |
| return visitor.visitLeftOuterTimeJoin(this, context); |
| } |
| |
| @Override |
| protected void serializeAttributes(ByteBuffer byteBuffer) { |
| PlanNodeType.LEFT_OUTER_TIME_JOIN.serialize(byteBuffer); |
| ReadWriteIOUtils.write(mergeOrder.ordinal(), byteBuffer); |
| } |
| |
| @Override |
| protected void serializeAttributes(DataOutputStream stream) throws IOException { |
| PlanNodeType.LEFT_OUTER_TIME_JOIN.serialize(stream); |
| ReadWriteIOUtils.write(mergeOrder.ordinal(), stream); |
| } |
| |
| public static LeftOuterTimeJoinNode deserialize(ByteBuffer byteBuffer) { |
| Ordering mergeOrder = Ordering.values()[ReadWriteIOUtils.readInt(byteBuffer)]; |
| PlanNodeId planNodeId = PlanNodeId.deserialize(byteBuffer); |
| return new LeftOuterTimeJoinNode(planNodeId, mergeOrder); |
| } |
| |
| @Override |
| public String toString() { |
| return "LeftOuterTimeJoinNode-" + this.getPlanNodeId(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| if (!super.equals(o)) { |
| return false; |
| } |
| LeftOuterTimeJoinNode that = (LeftOuterTimeJoinNode) o; |
| return mergeOrder == that.mergeOrder; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(super.hashCode(), mergeOrder); |
| } |
| } |