| /* |
| * 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.MultiChildProcessNode; |
| 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; |
| import java.util.Optional; |
| import java.util.stream.Collectors; |
| |
| /** |
| * This node is responsible for joining two or more TsBlock. |
| * |
| * <p>The join algorithm is <b>inner join</b> on timestamp column —— take the <b>intersection</b> of |
| * all child timestamps as the time column 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 |
| * 2, 2 2, 2 2, 2, 2 |
| * 3, 3 |
| * </pre> |
| */ |
| public class InnerTimeJoinNode extends MultiChildProcessNode { |
| |
| // This parameter indicates the order when executing multiway merge sort. |
| private final Ordering mergeOrder; |
| |
| // null for all time partitions |
| // empty for zero time partitions |
| private List<Long> timePartitions; |
| |
| // in most cases, it will be null, if we've got more than one root InnerTimeJoinNode, and these |
| // InnerTimeJoinNodes' result will be merged by MergeSortNode |
| // we will make sure that all these InnerTimeJoinNodes output same column names; |
| // for logical planner, it will also be null |
| private List<String> outputColumnNames; |
| |
| public InnerTimeJoinNode(PlanNodeId id, List<PlanNode> children, Ordering mergeOrder) { |
| this(id, children, mergeOrder, null, null); |
| } |
| |
| public InnerTimeJoinNode( |
| PlanNodeId id, |
| Ordering mergeOrder, |
| List<Long> timePartitions, |
| List<String> outputColumnNames) { |
| super(id); |
| this.mergeOrder = mergeOrder; |
| this.timePartitions = timePartitions; |
| this.outputColumnNames = outputColumnNames; |
| } |
| |
| public InnerTimeJoinNode( |
| PlanNodeId id, |
| List<PlanNode> children, |
| Ordering mergeOrder, |
| List<Long> timePartitions, |
| List<String> outputColumnNames) { |
| super(id, children); |
| this.mergeOrder = mergeOrder; |
| this.timePartitions = timePartitions; |
| this.outputColumnNames = outputColumnNames; |
| } |
| |
| public Ordering getMergeOrder() { |
| return mergeOrder; |
| } |
| |
| @Override |
| public PlanNodeType getType() { |
| return PlanNodeType.INNER_TIME_JOIN; |
| } |
| |
| @Override |
| public PlanNode clone() { |
| return new InnerTimeJoinNode( |
| getPlanNodeId(), getMergeOrder(), timePartitions, outputColumnNames); |
| } |
| |
| @Override |
| public PlanNode createSubNode(int subNodeId, int startIndex, int endIndex) { |
| return new InnerTimeJoinNode( |
| new PlanNodeId(String.format("%s-%s", getPlanNodeId(), subNodeId)), |
| new ArrayList<>(children.subList(startIndex, endIndex)), |
| getMergeOrder(), |
| timePartitions, |
| null); |
| } |
| |
| @Override |
| public List<String> getOutputColumnNames() { |
| return outputColumnNames != null |
| ? outputColumnNames |
| : children.stream() |
| .map(PlanNode::getOutputColumnNames) |
| .flatMap(List::stream) |
| .collect(Collectors.toList()); |
| } |
| |
| @Override |
| public <R, C> R accept(PlanVisitor<R, C> visitor, C context) { |
| return visitor.visitInnerTimeJoin(this, context); |
| } |
| |
| @Override |
| protected void serializeAttributes(ByteBuffer byteBuffer) { |
| PlanNodeType.INNER_TIME_JOIN.serialize(byteBuffer); |
| ReadWriteIOUtils.write(mergeOrder.ordinal(), byteBuffer); |
| if (timePartitions == null) { |
| ReadWriteIOUtils.write(false, byteBuffer); |
| } else { |
| ReadWriteIOUtils.write(true, byteBuffer); |
| ReadWriteIOUtils.write(timePartitions.size(), byteBuffer); |
| for (Long timePartitionId : timePartitions) { |
| ReadWriteIOUtils.write(timePartitionId, byteBuffer); |
| } |
| } |
| if (outputColumnNames == null) { |
| ReadWriteIOUtils.write(false, byteBuffer); |
| } else { |
| ReadWriteIOUtils.write(true, byteBuffer); |
| ReadWriteIOUtils.write(outputColumnNames.size(), byteBuffer); |
| for (String outputColumnName : outputColumnNames) { |
| ReadWriteIOUtils.write(outputColumnName, byteBuffer); |
| } |
| } |
| } |
| |
| @Override |
| protected void serializeAttributes(DataOutputStream stream) throws IOException { |
| PlanNodeType.INNER_TIME_JOIN.serialize(stream); |
| ReadWriteIOUtils.write(mergeOrder.ordinal(), stream); |
| if (timePartitions == null) { |
| ReadWriteIOUtils.write(false, stream); |
| } else { |
| ReadWriteIOUtils.write(true, stream); |
| ReadWriteIOUtils.write(timePartitions.size(), stream); |
| for (Long timePartitionId : timePartitions) { |
| ReadWriteIOUtils.write(timePartitionId, stream); |
| } |
| } |
| if (outputColumnNames == null) { |
| ReadWriteIOUtils.write(false, stream); |
| } else { |
| ReadWriteIOUtils.write(true, stream); |
| ReadWriteIOUtils.write(outputColumnNames.size(), stream); |
| for (String outputColumnName : outputColumnNames) { |
| ReadWriteIOUtils.write(outputColumnName, stream); |
| } |
| } |
| } |
| |
| public static InnerTimeJoinNode deserialize(ByteBuffer byteBuffer) { |
| Ordering mergeOrder = Ordering.values()[ReadWriteIOUtils.readInt(byteBuffer)]; |
| List<Long> timePartitionIds = null; |
| boolean hasTimePartitionIds = ReadWriteIOUtils.readBool(byteBuffer); |
| if (hasTimePartitionIds) { |
| int size = ReadWriteIOUtils.readInt(byteBuffer); |
| timePartitionIds = new ArrayList<>(size); |
| for (int i = 0; i < size; i++) { |
| timePartitionIds.add(ReadWriteIOUtils.readLong(byteBuffer)); |
| } |
| } |
| List<String> outputColumnNames = null; |
| boolean hasOutputColumnNames = ReadWriteIOUtils.readBool(byteBuffer); |
| if (hasOutputColumnNames) { |
| int size = ReadWriteIOUtils.readInt(byteBuffer); |
| outputColumnNames = new ArrayList<>(size); |
| for (int i = 0; i < size; i++) { |
| outputColumnNames.add(ReadWriteIOUtils.readString(byteBuffer)); |
| } |
| } |
| PlanNodeId planNodeId = PlanNodeId.deserialize(byteBuffer); |
| return new InnerTimeJoinNode( |
| planNodeId, new ArrayList<>(), mergeOrder, timePartitionIds, outputColumnNames); |
| } |
| |
| @Override |
| public String toString() { |
| return "InnerTimeJoinNode-" + 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; |
| } |
| InnerTimeJoinNode that = (InnerTimeJoinNode) o; |
| return mergeOrder == that.mergeOrder; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(super.hashCode(), mergeOrder); |
| } |
| |
| public void setTimePartitions(List<Long> timePartitions) { |
| this.timePartitions = timePartitions; |
| } |
| |
| // null for all time partitions |
| // empty for zero time partitions |
| public Optional<List<Long>> getTimePartitions() { |
| return Optional.ofNullable(timePartitions); |
| } |
| |
| public void setOutputColumnNames(List<String> outputColumnNames) { |
| this.outputColumnNames = outputColumnNames; |
| } |
| |
| public boolean outputColumnNamesIsNull() { |
| return outputColumnNames == null; |
| } |
| } |