| /* |
| * 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.execution.operator.process.last; |
| |
| import org.apache.iotdb.db.queryengine.execution.operator.Operator; |
| import org.apache.iotdb.db.queryengine.execution.operator.OperatorContext; |
| import org.apache.iotdb.db.queryengine.execution.operator.process.ProcessOperator; |
| import org.apache.iotdb.tsfile.read.common.block.TsBlock; |
| import org.apache.iotdb.tsfile.read.common.block.TsBlockBuilder; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| |
| public class LastQueryTransformOperator implements ProcessOperator { |
| |
| private String viewPath; |
| |
| private String dataType; |
| |
| private final OperatorContext operatorContext; |
| |
| // the child of LastQueryTransformOperator will always be AggOperator |
| private final Operator child; |
| |
| private TsBlockBuilder tsBlockBuilder; |
| |
| public LastQueryTransformOperator( |
| String viewPath, String dataType, OperatorContext operatorContext, Operator child) { |
| this.viewPath = viewPath; |
| this.dataType = dataType; |
| this.operatorContext = operatorContext; |
| this.child = child; |
| this.tsBlockBuilder = LastQueryUtil.createTsBlockBuilder(1); |
| } |
| |
| @Override |
| public OperatorContext getOperatorContext() { |
| return this.operatorContext; |
| } |
| |
| @Override |
| public ListenableFuture<?> isBlocked() { |
| return child.isBlocked(); |
| } |
| |
| @Override |
| public TsBlock next() throws Exception { |
| if (!tsBlockBuilder.isFull()) { |
| TsBlock tsBlock = child.nextWithTimer(); |
| if (tsBlock == null) { |
| return null; |
| } else if (!tsBlock.isEmpty()) { |
| if (tsBlock.getColumn(1).isNull(0)) { |
| return null; |
| } |
| LastQueryUtil.appendLastValue( |
| tsBlockBuilder, |
| tsBlock.getColumn(0).getLong(0), |
| viewPath, |
| tsBlock.getColumn(1).getTsPrimitiveType(0).getStringValue(), |
| dataType); |
| } |
| } else { |
| child.close(); |
| } |
| |
| TsBlock res = tsBlockBuilder.build(); |
| tsBlockBuilder.reset(); |
| return res; |
| } |
| |
| @Override |
| public boolean hasNext() throws Exception { |
| return child.hasNext(); |
| } |
| |
| @Override |
| public boolean isFinished() throws Exception { |
| return !hasNextWithTimer(); |
| } |
| |
| @Override |
| public long calculateMaxPeekMemory() { |
| return Math.max(child.calculateMaxPeekMemory(), child.calculateRetainedSizeAfterCallingNext()); |
| } |
| |
| @Override |
| public long calculateMaxReturnSize() { |
| return child.calculateMaxReturnSize(); |
| } |
| |
| @Override |
| public long calculateRetainedSizeAfterCallingNext() { |
| return child.calculateRetainedSizeAfterCallingNext(); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| if (child != null) { |
| child.close(); |
| } |
| tsBlockBuilder = null; |
| } |
| } |