| /* |
| * 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.tsfile.read.query.executor; |
| |
| import org.apache.iotdb.tsfile.file.metadata.IChunkMetadata; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.read.common.Path; |
| import org.apache.iotdb.tsfile.read.controller.IChunkLoader; |
| import org.apache.iotdb.tsfile.read.controller.IMetadataQuerier; |
| import org.apache.iotdb.tsfile.read.expression.IExpression; |
| import org.apache.iotdb.tsfile.read.expression.QueryExpression; |
| import org.apache.iotdb.tsfile.read.expression.impl.BinaryExpression; |
| import org.apache.iotdb.tsfile.read.expression.impl.SingleSeriesExpression; |
| import org.apache.iotdb.tsfile.read.query.dataset.DataSetWithTimeGenerator; |
| import org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator; |
| import org.apache.iotdb.tsfile.read.query.timegenerator.TsFileTimeGenerator; |
| import org.apache.iotdb.tsfile.read.reader.series.FileSeriesReaderByTimestamp; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| public class ExecutorWithTimeGenerator implements QueryExecutor { |
| |
| private IMetadataQuerier metadataQuerier; |
| private IChunkLoader chunkLoader; |
| |
| public ExecutorWithTimeGenerator(IMetadataQuerier metadataQuerier, IChunkLoader chunkLoader) { |
| this.metadataQuerier = metadataQuerier; |
| this.chunkLoader = chunkLoader; |
| } |
| |
| /** |
| * All leaf nodes of queryFilter in queryExpression are SeriesFilters, We use a TimeGenerator to |
| * control query processing. for more information, see DataSetWithTimeGenerator |
| * |
| * @return DataSet with TimeGenerator |
| */ |
| @Override |
| public DataSetWithTimeGenerator execute(QueryExpression queryExpression) throws IOException { |
| |
| IExpression expression = queryExpression.getExpression(); |
| List<Path> selectedPathList = queryExpression.getSelectedSeries(); |
| |
| // get TimeGenerator by IExpression |
| TimeGenerator timeGenerator = new TsFileTimeGenerator(expression, chunkLoader, metadataQuerier); |
| |
| // the size of hasFilter is equal to selectedPathList, if a series has a filter, it is true, |
| // otherwise false |
| List<Boolean> cached = |
| markFilterdPaths(expression, selectedPathList, timeGenerator.hasOrNode()); |
| List<FileSeriesReaderByTimestamp> readersOfSelectedSeries = new ArrayList<>(); |
| List<TSDataType> dataTypes = new ArrayList<>(); |
| |
| Iterator<Boolean> cachedIterator = cached.iterator(); |
| Iterator<Path> selectedPathIterator = selectedPathList.iterator(); |
| while (cachedIterator.hasNext()) { |
| boolean cachedValue = cachedIterator.next(); |
| Path selectedPath = selectedPathIterator.next(); |
| |
| List<IChunkMetadata> chunkMetadataList = metadataQuerier.getChunkMetaDataList(selectedPath); |
| if (!chunkMetadataList.isEmpty()) { |
| dataTypes.add(chunkMetadataList.get(0).getDataType()); |
| if (cachedValue) { |
| readersOfSelectedSeries.add(null); |
| continue; |
| } |
| FileSeriesReaderByTimestamp seriesReader = |
| new FileSeriesReaderByTimestamp(chunkLoader, chunkMetadataList); |
| readersOfSelectedSeries.add(seriesReader); |
| } else { |
| selectedPathIterator.remove(); |
| cachedIterator.remove(); |
| } |
| } |
| |
| return new DataSetWithTimeGenerator( |
| selectedPathList, cached, dataTypes, timeGenerator, readersOfSelectedSeries); |
| } |
| |
| public static List<Boolean> markFilterdPaths( |
| IExpression expression, List<Path> selectedPaths, boolean hasOrNode) { |
| List<Boolean> cached = new ArrayList<>(); |
| if (hasOrNode) { |
| for (int i = 0; i < selectedPaths.size(); i++) { |
| cached.add(false); |
| } |
| return cached; |
| } |
| |
| HashSet<Path> filteredPaths = new HashSet<>(); |
| getAllFilteredPaths(expression, filteredPaths); |
| |
| for (Path selectedPath : selectedPaths) { |
| cached.add(filteredPaths.contains(selectedPath)); |
| } |
| |
| return cached; |
| } |
| |
| private static void getAllFilteredPaths(IExpression expression, HashSet<Path> paths) { |
| if (expression instanceof BinaryExpression) { |
| getAllFilteredPaths(((BinaryExpression) expression).getLeft(), paths); |
| getAllFilteredPaths(((BinaryExpression) expression).getRight(), paths); |
| } else if (expression instanceof SingleSeriesExpression) { |
| paths.add(((SingleSeriesExpression) expression).getSeriesPath()); |
| } |
| } |
| } |