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RawDataQueryExecutor.java
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RawDataQueryExecutor.java
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/*
* 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.executor;
import org.apache.iotdb.db.engine.querycontext.QueryDataSource;
import org.apache.iotdb.db.exception.StorageEngineException;
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.dataset.NonAlignEngineDataSet;
import org.apache.iotdb.db.query.dataset.RawQueryDataSetWithValueFilter;
import org.apache.iotdb.db.query.dataset.RawQueryDataSetWithoutValueFilter;
import org.apache.iotdb.db.query.reader.series.IReaderByTimestamp;
import org.apache.iotdb.db.query.reader.series.ManagedSeriesReader;
import org.apache.iotdb.db.query.reader.series.SeriesRawDataBatchReader;
import org.apache.iotdb.db.query.reader.series.SeriesReaderByTimestamp;
import org.apache.iotdb.db.query.timegenerator.ServerTimeGenerator;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.read.common.Path;
import org.apache.iotdb.tsfile.read.expression.IExpression;
import org.apache.iotdb.tsfile.read.expression.impl.GlobalTimeExpression;
import org.apache.iotdb.tsfile.read.filter.basic.Filter;
import org.apache.iotdb.tsfile.read.query.dataset.QueryDataSet;
import org.apache.iotdb.tsfile.read.query.timegenerator.TimeGenerator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* IoTDB query executor.
*/
public class RawDataQueryExecutor {
protected List<Path> deduplicatedPaths;
protected List<TSDataType> deduplicatedDataTypes;
protected IExpression optimizedExpression;
public RawDataQueryExecutor(RawDataQueryPlan queryPlan) {
this.deduplicatedPaths = queryPlan.getDeduplicatedPaths();
this.deduplicatedDataTypes = queryPlan.getDeduplicatedDataTypes();
this.optimizedExpression = queryPlan.getExpression();
}
/**
* without filter or with global time filter.
*/
public QueryDataSet executeWithoutValueFilter(QueryContext context)
throws StorageEngineException {
List<ManagedSeriesReader> readersOfSelectedSeries = initManagedSeriesReader(context);
try {
return new RawQueryDataSetWithoutValueFilter(deduplicatedPaths, deduplicatedDataTypes,
readersOfSelectedSeries);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new StorageEngineException(e.getMessage());
} catch (IOException e) {
throw new StorageEngineException(e.getMessage());
}
}
public QueryDataSet executeNonAlign(QueryContext context) throws StorageEngineException {
List<ManagedSeriesReader> readersOfSelectedSeries = initManagedSeriesReader(context);
return new NonAlignEngineDataSet(deduplicatedPaths, deduplicatedDataTypes,
readersOfSelectedSeries);
}
protected List<ManagedSeriesReader> initManagedSeriesReader(QueryContext context)
throws StorageEngineException {
Filter timeFilter = null;
if (optimizedExpression != null) {
timeFilter = ((GlobalTimeExpression) optimizedExpression).getFilter();
}
List<ManagedSeriesReader> readersOfSelectedSeries = new ArrayList<>();
for (int i = 0; i < deduplicatedPaths.size(); i++) {
Path path = deduplicatedPaths.get(i);
TSDataType dataType = deduplicatedDataTypes.get(i);
QueryDataSource queryDataSource = QueryResourceManager.getInstance()
.getQueryDataSource(path, context, timeFilter);
timeFilter = queryDataSource.updateFilterUsingTTL(timeFilter);
ManagedSeriesReader reader = new SeriesRawDataBatchReader(path, dataType, context,
queryDataSource, timeFilter, null, null);
readersOfSelectedSeries.add(reader);
}
return readersOfSelectedSeries;
}
/**
* executeWithValueFilter query.
*
* @return QueryDataSet object
* @throws StorageEngineException StorageEngineException
*/
public QueryDataSet executeWithValueFilter(QueryContext context) throws StorageEngineException {
TimeGenerator timestampGenerator = getTimeGenerator(
optimizedExpression, context);
List<IReaderByTimestamp> readersOfSelectedSeries = new ArrayList<>();
for (int i = 0; i < deduplicatedPaths.size(); i++) {
Path path = deduplicatedPaths.get(i);
IReaderByTimestamp seriesReaderByTimestamp = getReaderByTimestamp(path,
deduplicatedDataTypes.get(i), context);
readersOfSelectedSeries.add(seriesReaderByTimestamp);
}
return new RawQueryDataSetWithValueFilter(deduplicatedPaths, deduplicatedDataTypes,
timestampGenerator, readersOfSelectedSeries);
}
protected IReaderByTimestamp getReaderByTimestamp(Path path, TSDataType dataType,
QueryContext context)
throws StorageEngineException {
return new SeriesReaderByTimestamp(path,
dataType, context,
QueryResourceManager.getInstance().getQueryDataSource(path, context, null), null);
}
protected TimeGenerator getTimeGenerator(IExpression expression,
QueryContext context) throws StorageEngineException {
return new ServerTimeGenerator(expression, context);
}
}