| /* |
| * 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.source; |
| |
| import org.apache.iotdb.commons.path.PartialPath; |
| import org.apache.iotdb.db.queryengine.execution.operator.OperatorContext; |
| import org.apache.iotdb.db.queryengine.plan.planner.plan.node.PlanNodeId; |
| import org.apache.iotdb.db.queryengine.plan.planner.plan.parameter.SeriesScanOptions; |
| import org.apache.iotdb.db.queryengine.plan.statement.component.Ordering; |
| import org.apache.iotdb.tsfile.common.conf.TSFileDescriptor; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.read.common.block.TsBlock; |
| import org.apache.iotdb.tsfile.read.common.block.column.Column; |
| import org.apache.iotdb.tsfile.read.common.block.column.ColumnBuilder; |
| import org.apache.iotdb.tsfile.read.common.block.column.TimeColumn; |
| import org.apache.iotdb.tsfile.read.common.block.column.TimeColumnBuilder; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| |
| public class SeriesScanOperator extends AbstractDataSourceOperator { |
| |
| private boolean finished = false; |
| |
| public SeriesScanOperator( |
| OperatorContext context, |
| PlanNodeId sourceId, |
| PartialPath seriesPath, |
| Ordering scanOrder, |
| SeriesScanOptions seriesScanOptions) { |
| this.sourceId = sourceId; |
| this.operatorContext = context; |
| this.seriesScanUtil = |
| new SeriesScanUtil(seriesPath, scanOrder, seriesScanOptions, context.getInstanceContext()); |
| this.maxReturnSize = |
| Math.min(maxReturnSize, TSFileDescriptor.getInstance().getConfig().getPageSizeInByte()); |
| } |
| |
| @Override |
| public TsBlock next() throws Exception { |
| if (retainedTsBlock != null) { |
| return getResultFromRetainedTsBlock(); |
| } |
| resultTsBlock = resultTsBlockBuilder.build(); |
| resultTsBlockBuilder.reset(); |
| return checkTsBlockSizeAndGetResult(); |
| } |
| |
| @SuppressWarnings("squid:S112") |
| @Override |
| public boolean hasNext() throws Exception { |
| if (retainedTsBlock != null) { |
| return true; |
| } |
| try { |
| |
| // start stopwatch |
| long maxRuntime = operatorContext.getMaxRunTime().roundTo(TimeUnit.NANOSECONDS); |
| long start = System.nanoTime(); |
| |
| // here use do-while to promise doing this at least once |
| do { |
| /* |
| * 1. consume page data firstly |
| * 2. consume chunk data secondly |
| * 3. consume next file finally |
| */ |
| if (!readPageData() && !readChunkData() && !readFileData()) { |
| break; |
| } |
| } while (System.nanoTime() - start < maxRuntime && !resultTsBlockBuilder.isFull()); |
| |
| finished = resultTsBlockBuilder.isEmpty(); |
| |
| return !finished; |
| } catch (IOException e) { |
| throw new RuntimeException("Error happened while scanning the file", e); |
| } |
| } |
| |
| @Override |
| public boolean isFinished() throws Exception { |
| return finished; |
| } |
| |
| @Override |
| public long calculateMaxPeekMemory() { |
| return Math.max( |
| maxReturnSize, TSFileDescriptor.getInstance().getConfig().getPageSizeInByte() * 3L); |
| } |
| |
| @Override |
| public long calculateMaxReturnSize() { |
| return maxReturnSize; |
| } |
| |
| @Override |
| public long calculateRetainedSizeAfterCallingNext() { |
| return calculateMaxPeekMemoryWithCounter() - calculateMaxReturnSize(); |
| } |
| |
| private boolean readFileData() throws IOException { |
| while (seriesScanUtil.hasNextFile()) { |
| if (readChunkData()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean readChunkData() throws IOException { |
| while (seriesScanUtil.hasNextChunk()) { |
| if (readPageData()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean readPageData() throws IOException { |
| while (seriesScanUtil.hasNextPage()) { |
| TsBlock tsBlock = seriesScanUtil.nextPage(); |
| |
| if (!isEmpty(tsBlock)) { |
| appendToBuilder(tsBlock); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private void appendToBuilder(TsBlock tsBlock) { |
| TimeColumnBuilder timeColumnBuilder = resultTsBlockBuilder.getTimeColumnBuilder(); |
| TimeColumn timeColumn = tsBlock.getTimeColumn(); |
| ColumnBuilder columnBuilder = resultTsBlockBuilder.getColumnBuilder(0); |
| Column column = tsBlock.getColumn(0); |
| |
| if (column.mayHaveNull()) { |
| for (int i = 0, size = tsBlock.getPositionCount(); i < size; i++) { |
| timeColumnBuilder.writeLong(timeColumn.getLong(i)); |
| if (column.isNull(i)) { |
| columnBuilder.appendNull(); |
| } else { |
| columnBuilder.write(column, i); |
| } |
| resultTsBlockBuilder.declarePosition(); |
| } |
| } else { |
| for (int i = 0, size = tsBlock.getPositionCount(); i < size; i++) { |
| timeColumnBuilder.writeLong(timeColumn.getLong(i)); |
| columnBuilder.write(column, i); |
| resultTsBlockBuilder.declarePosition(); |
| } |
| } |
| } |
| |
| private boolean isEmpty(TsBlock tsBlock) { |
| return tsBlock == null || tsBlock.isEmpty(); |
| } |
| |
| @Override |
| protected List<TSDataType> getResultDataTypes() { |
| return seriesScanUtil.getTsDataTypeList(); |
| } |
| } |