| /* |
| * 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.last; |
| |
| 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.iotdb.tsfile.utils.ReadWriteIOUtils; |
| |
| import javax.annotation.Nullable; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| import java.util.Objects; |
| |
| import static org.apache.iotdb.db.queryengine.plan.planner.plan.node.source.LastQueryScanNode.LAST_QUERY_HEADER_COLUMNS; |
| |
| public class LastQueryNode extends MultiChildProcessNode { |
| |
| // the ordering of timeseries in the result of last query |
| // which is set to null if there is no need to sort |
| private Ordering timeseriesOrdering; |
| |
| // if children contains LastTransformNode, this variable is only used in distribute plan |
| private boolean containsLastTransformNode; |
| |
| public LastQueryNode( |
| PlanNodeId id, @Nullable Ordering timeseriesOrdering, boolean containsLastTransformNode) { |
| super(id); |
| this.timeseriesOrdering = timeseriesOrdering; |
| this.containsLastTransformNode = containsLastTransformNode; |
| } |
| |
| public LastQueryNode( |
| PlanNodeId id, |
| List<PlanNode> children, |
| @Nullable Ordering timeseriesOrdering, |
| boolean containsLastTransformNode) { |
| super(id, children); |
| this.timeseriesOrdering = timeseriesOrdering; |
| this.containsLastTransformNode = containsLastTransformNode; |
| } |
| |
| @Override |
| public List<PlanNode> getChildren() { |
| return children; |
| } |
| |
| @Override |
| public void addChild(PlanNode child) { |
| children.add(child); |
| } |
| |
| @Override |
| public PlanNodeType getType() { |
| return PlanNodeType.LAST_QUERY; |
| } |
| |
| @Override |
| public PlanNode clone() { |
| return new LastQueryNode(getPlanNodeId(), timeseriesOrdering, containsLastTransformNode); |
| } |
| |
| @Override |
| public int allowedChildCount() { |
| return CHILD_COUNT_NO_LIMIT; |
| } |
| |
| @Override |
| public List<String> getOutputColumnNames() { |
| return LAST_QUERY_HEADER_COLUMNS; |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("LastQueryNode-%s", 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; |
| } |
| LastQueryNode that = (LastQueryNode) o; |
| return timeseriesOrdering.equals(that.timeseriesOrdering); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(super.hashCode(), timeseriesOrdering); |
| } |
| |
| @Override |
| public <R, C> R accept(PlanVisitor<R, C> visitor, C context) { |
| return visitor.visitLastQuery(this, context); |
| } |
| |
| @Override |
| protected void serializeAttributes(ByteBuffer byteBuffer) { |
| PlanNodeType.LAST_QUERY.serialize(byteBuffer); |
| if (timeseriesOrdering == null) { |
| ReadWriteIOUtils.write((byte) 0, byteBuffer); |
| } else { |
| ReadWriteIOUtils.write((byte) 1, byteBuffer); |
| ReadWriteIOUtils.write(timeseriesOrdering.ordinal(), byteBuffer); |
| } |
| } |
| |
| @Override |
| protected void serializeAttributes(DataOutputStream stream) throws IOException { |
| PlanNodeType.LAST_QUERY.serialize(stream); |
| if (timeseriesOrdering == null) { |
| ReadWriteIOUtils.write((byte) 0, stream); |
| } else { |
| ReadWriteIOUtils.write((byte) 1, stream); |
| ReadWriteIOUtils.write(timeseriesOrdering.ordinal(), stream); |
| } |
| } |
| |
| public static LastQueryNode deserialize(ByteBuffer byteBuffer) { |
| byte needOrderByTimeseries = ReadWriteIOUtils.readByte(byteBuffer); |
| Ordering timeseriesOrdering = null; |
| if (needOrderByTimeseries == 1) { |
| timeseriesOrdering = Ordering.values()[ReadWriteIOUtils.readInt(byteBuffer)]; |
| } |
| PlanNodeId planNodeId = PlanNodeId.deserialize(byteBuffer); |
| return new LastQueryNode(planNodeId, timeseriesOrdering, false); |
| } |
| |
| @Override |
| public void setChildren(List<PlanNode> children) { |
| this.children = children; |
| } |
| |
| public Ordering getTimeseriesOrdering() { |
| return timeseriesOrdering; |
| } |
| |
| public void setTimeseriesOrdering(Ordering timeseriesOrdering) { |
| this.timeseriesOrdering = timeseriesOrdering; |
| } |
| |
| public boolean isContainsLastTransformNode() { |
| return this.containsLastTransformNode; |
| } |
| |
| public void setContainsLastTransformNode() { |
| this.containsLastTransformNode = true; |
| } |
| |
| public boolean needOrderByTimeseries() { |
| return timeseriesOrdering != null; |
| } |
| } |