| /* |
| * 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.query.timegenerator; |
| |
| import org.apache.iotdb.db.engine.StorageEngine; |
| import org.apache.iotdb.db.engine.querycontext.QueryDataSource; |
| import org.apache.iotdb.db.engine.storagegroup.StorageGroupProcessor; |
| import org.apache.iotdb.db.exception.StorageEngineException; |
| import org.apache.iotdb.db.exception.metadata.MetadataException; |
| import org.apache.iotdb.db.metadata.PartialPath; |
| import org.apache.iotdb.db.qp.physical.crud.RawDataQueryPlan; |
| import org.apache.iotdb.db.query.context.QueryContext; |
| import org.apache.iotdb.db.query.control.QueryResourceManager; |
| import org.apache.iotdb.db.query.reader.series.SeriesRawDataBatchReader; |
| import org.apache.iotdb.db.service.IoTDB; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.read.expression.ExpressionType; |
| import org.apache.iotdb.tsfile.read.expression.IBinaryExpression; |
| import org.apache.iotdb.tsfile.read.expression.IExpression; |
| import org.apache.iotdb.tsfile.read.expression.impl.SingleSeriesExpression; |
| import org.apache.iotdb.tsfile.read.filter.basic.Filter; |
| import org.apache.iotdb.tsfile.read.filter.basic.UnaryFilter; |
| import org.apache.iotdb.tsfile.read.filter.factory.FilterType; |
| import org.apache.iotdb.tsfile.read.filter.operator.AndFilter; |
| import org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator; |
| import org.apache.iotdb.tsfile.read.reader.IBatchReader; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * A timestamp generator for query with filter. e.g. For query clause "select s1, s2 from root where |
| * s3 < 0 and time > 100", this class can iterate back to every timestamp of the query. |
| */ |
| public class ServerTimeGenerator extends TimeGenerator { |
| |
| protected QueryContext context; |
| protected RawDataQueryPlan queryPlan; |
| |
| public ServerTimeGenerator(QueryContext context) { |
| this.context = context; |
| } |
| |
| /** Constructor of EngineTimeGenerator. */ |
| public ServerTimeGenerator(QueryContext context, RawDataQueryPlan queryPlan) |
| throws StorageEngineException { |
| this.context = context; |
| this.queryPlan = queryPlan; |
| try { |
| serverConstructNode(queryPlan.getExpression()); |
| } catch (IOException e) { |
| throw new StorageEngineException(e); |
| } |
| } |
| |
| public void serverConstructNode(IExpression expression) |
| throws IOException, StorageEngineException { |
| List<PartialPath> pathList = new ArrayList<>(); |
| getPartialPathFromExpression(expression, pathList); |
| List<StorageGroupProcessor> list = StorageEngine.getInstance().mergeLock(pathList); |
| try { |
| operatorNode = construct(expression); |
| } finally { |
| StorageEngine.getInstance().mergeUnLock(list); |
| } |
| } |
| |
| private void getPartialPathFromExpression(IExpression expression, List<PartialPath> pathList) { |
| if (expression.getType() == ExpressionType.SERIES) { |
| pathList.add((PartialPath) ((SingleSeriesExpression) expression).getSeriesPath()); |
| } else { |
| getPartialPathFromExpression(((IBinaryExpression) expression).getLeft(), pathList); |
| getPartialPathFromExpression(((IBinaryExpression) expression).getRight(), pathList); |
| } |
| } |
| |
| @Override |
| protected IBatchReader generateNewBatchReader(SingleSeriesExpression expression) |
| throws IOException { |
| try { |
| expression.setSeriesPath( |
| IoTDB.metaManager.transformPath((PartialPath) expression.getSeriesPath())); |
| } catch (MetadataException e) { |
| throw new IOException(e); |
| } |
| Filter valueFilter = expression.getFilter(); |
| PartialPath path = (PartialPath) expression.getSeriesPath(); |
| TSDataType dataType; |
| QueryDataSource queryDataSource; |
| try { |
| dataType = IoTDB.metaManager.getSeriesType(path); |
| queryDataSource = |
| QueryResourceManager.getInstance().getQueryDataSource(path, context, valueFilter); |
| // update valueFilter by TTL |
| valueFilter = queryDataSource.updateFilterUsingTTL(valueFilter); |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| |
| // get the TimeFilter part in SingleSeriesExpression |
| Filter timeFilter = getTimeFilter(valueFilter); |
| |
| return new SeriesRawDataBatchReader( |
| path, |
| queryPlan.getAllMeasurementsInDevice(path.getDevice()), |
| dataType, |
| context, |
| queryDataSource, |
| timeFilter, |
| valueFilter, |
| null, |
| queryPlan.isAscending()); |
| } |
| |
| /** extract time filter from a value filter */ |
| private Filter getTimeFilter(Filter filter) { |
| if (filter instanceof UnaryFilter |
| && ((UnaryFilter) filter).getFilterType() == FilterType.TIME_FILTER) { |
| return filter; |
| } |
| if (filter instanceof AndFilter) { |
| Filter leftTimeFilter = getTimeFilter(((AndFilter) filter).getLeft()); |
| Filter rightTimeFilter = getTimeFilter(((AndFilter) filter).getRight()); |
| if (leftTimeFilter != null && rightTimeFilter != null) { |
| return filter; |
| } else if (leftTimeFilter != null) { |
| return leftTimeFilter; |
| } else { |
| return rightTimeFilter; |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| protected boolean isAscending() { |
| return queryPlan.isAscending(); |
| } |
| } |