| /* |
| * 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.commons.path.MeasurementPath; |
| import org.apache.iotdb.db.queryengine.execution.operator.Operator; |
| import org.apache.iotdb.db.queryengine.execution.operator.OperatorContext; |
| import org.apache.iotdb.db.queryengine.plan.analyze.cache.schema.DataNodeSchemaCache; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.read.common.block.TsBlock; |
| import org.apache.iotdb.tsfile.utils.TsPrimitiveType; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| public class UpdateLastCacheOperator extends AbstractUpdateLastCacheOperator { |
| |
| // fullPath for queried time series |
| // It should be exact PartialPath, neither MeasurementPath nor AlignedPath, because lastCache only |
| // accept PartialPath |
| private final MeasurementPath fullPath; |
| |
| // type for queried time series |
| protected final String dataType; |
| |
| public UpdateLastCacheOperator( |
| OperatorContext operatorContext, |
| Operator child, |
| MeasurementPath fullPath, |
| TSDataType dataType, |
| DataNodeSchemaCache dataNodeSchemaCache, |
| boolean needUpdateCache, |
| boolean isNeedUpdateNullEntry) { |
| super(operatorContext, child, dataNodeSchemaCache, needUpdateCache, isNeedUpdateNullEntry); |
| this.fullPath = fullPath; |
| this.dataType = dataType.name(); |
| } |
| |
| @Override |
| public TsBlock next() throws Exception { |
| TsBlock res = child.nextWithTimer(); |
| if (res == null) { |
| return null; |
| } |
| if (res.isEmpty()) { |
| return LAST_QUERY_EMPTY_TSBLOCK; |
| } |
| |
| checkArgument(res.getPositionCount() == 1, "last query result should only have one record"); |
| |
| // last value is null |
| if (res.getColumn(0).isNull(0)) { |
| // we still need to update last cache if there is no data for this time series to avoid |
| // scanning all files each time |
| if (needUpdateNullEntry) { |
| mayUpdateLastCache(Long.MIN_VALUE, null, fullPath); |
| } |
| return LAST_QUERY_EMPTY_TSBLOCK; |
| } |
| |
| long lastTime = res.getColumn(0).getLong(0); |
| TsPrimitiveType lastValue = res.getColumn(1).getTsPrimitiveType(0); |
| |
| mayUpdateLastCache(lastTime, lastValue, fullPath); |
| |
| tsBlockBuilder.reset(); |
| appendLastValueToTsBlockBuilder(lastTime, lastValue); |
| return tsBlockBuilder.build(); |
| } |
| |
| protected void appendLastValueToTsBlockBuilder(long lastTime, TsPrimitiveType lastValue) { |
| LastQueryUtil.appendLastValue( |
| tsBlockBuilder, lastTime, fullPath.getFullPath(), lastValue.getStringValue(), dataType); |
| } |
| } |