| /* |
| * 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; |
| |
| 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.parameter.OrderByParameter; |
| |
| 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.stream.Collectors; |
| |
| public class DeviceMergeNode extends MultiChildProcessNode { |
| |
| // The result output order, which could sort by device and time. |
| // The size of this list is 2 and the first SortItem in this list has higher priority. |
| private final OrderByParameter mergeOrderParameter; |
| |
| // the list of selected devices |
| private final List<String> devices; |
| |
| public DeviceMergeNode( |
| PlanNodeId id, OrderByParameter mergeOrderParameter, List<String> devices) { |
| super(id); |
| this.mergeOrderParameter = mergeOrderParameter; |
| this.devices = devices; |
| } |
| |
| public OrderByParameter getMergeOrderParameter() { |
| return mergeOrderParameter; |
| } |
| |
| public List<String> getDevices() { |
| return devices; |
| } |
| |
| @Override |
| public PlanNodeType getType() { |
| return PlanNodeType.DEVICE_MERGE; |
| } |
| |
| @Override |
| public PlanNode clone() { |
| return new DeviceMergeNode(getPlanNodeId(), getMergeOrderParameter(), getDevices()); |
| } |
| |
| @Override |
| public PlanNode createSubNode(int subNodeId, int startIndex, int endIndex) { |
| throw new UnsupportedOperationException( |
| "DeviceMergeNode should have only one local child in single data region."); |
| } |
| |
| @Override |
| public List<String> getOutputColumnNames() { |
| return children.stream() |
| .map(PlanNode::getOutputColumnNames) |
| .flatMap(List::stream) |
| .distinct() |
| .collect(Collectors.toList()); |
| } |
| |
| @Override |
| public <R, C> R accept(PlanVisitor<R, C> visitor, C context) { |
| return visitor.visitDeviceMerge(this, context); |
| } |
| |
| @Override |
| protected void serializeAttributes(ByteBuffer byteBuffer) { |
| PlanNodeType.DEVICE_MERGE.serialize(byteBuffer); |
| mergeOrderParameter.serializeAttributes(byteBuffer); |
| ReadWriteIOUtils.write(devices.size(), byteBuffer); |
| for (String deviceName : devices) { |
| ReadWriteIOUtils.write(deviceName, byteBuffer); |
| } |
| } |
| |
| @Override |
| protected void serializeAttributes(DataOutputStream stream) throws IOException { |
| PlanNodeType.DEVICE_MERGE.serialize(stream); |
| mergeOrderParameter.serializeAttributes(stream); |
| ReadWriteIOUtils.write(devices.size(), stream); |
| for (String deviceName : devices) { |
| ReadWriteIOUtils.write(deviceName, stream); |
| } |
| } |
| |
| public static DeviceMergeNode deserialize(ByteBuffer byteBuffer) { |
| OrderByParameter mergeOrderParameter = OrderByParameter.deserialize(byteBuffer); |
| int devicesSize = ReadWriteIOUtils.readInt(byteBuffer); |
| List<String> devices = new ArrayList<>(); |
| while (devicesSize > 0) { |
| devices.add(ReadWriteIOUtils.readString(byteBuffer)); |
| devicesSize--; |
| } |
| PlanNodeId planNodeId = PlanNodeId.deserialize(byteBuffer); |
| return new DeviceMergeNode(planNodeId, mergeOrderParameter, devices); |
| } |
| |
| @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; |
| } |
| DeviceMergeNode that = (DeviceMergeNode) o; |
| return Objects.equals(mergeOrderParameter, that.mergeOrderParameter) |
| && Objects.equals(devices, that.devices); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(super.hashCode(), mergeOrderParameter, devices); |
| } |
| |
| @Override |
| public String toString() { |
| return "DeviceMerge-" + this.getPlanNodeId(); |
| } |
| } |