| /* |
| * 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; |
| |
| import org.apache.iotdb.db.queryengine.execution.aggregation.Aggregator; |
| import org.apache.iotdb.db.queryengine.execution.aggregation.slidingwindow.SlidingWindowAggregator; |
| import org.apache.iotdb.db.queryengine.execution.aggregation.timerangeiterator.ITimeRangeIterator; |
| 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.planner.plan.parameter.GroupByTimeParameter; |
| |
| import org.apache.tsfile.enums.TSDataType; |
| import org.apache.tsfile.read.common.TimeRange; |
| import org.apache.tsfile.read.common.block.TsBlockBuilder; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static org.apache.iotdb.db.queryengine.execution.operator.AggregationUtil.appendAggregationResult; |
| import static org.apache.iotdb.db.queryengine.execution.operator.AggregationUtil.initTimeRangeIterator; |
| |
| public class SlidingWindowAggregationOperator extends SingleInputAggregationOperator { |
| |
| private final ITimeRangeIterator timeRangeIterator; |
| // Current interval of aggregation window [curStartTime, curEndTime) |
| private TimeRange curTimeRange; |
| |
| private final ITimeRangeIterator subTimeRangeIterator; |
| // Current interval of pre-aggregation window [curStartTime, curEndTime) |
| private TimeRange curSubTimeRange; |
| private final boolean outputEndTime; |
| |
| public SlidingWindowAggregationOperator( |
| OperatorContext operatorContext, |
| List<Aggregator> aggregators, |
| ITimeRangeIterator timeRangeIterator, |
| Operator child, |
| boolean ascending, |
| boolean outputEndTime, |
| GroupByTimeParameter groupByTimeParameter, |
| long maxReturnSize) { |
| super(operatorContext, aggregators, child, ascending, maxReturnSize); |
| checkArgument( |
| groupByTimeParameter != null, |
| "GroupByTimeParameter cannot be null in SlidingWindowAggregationOperator"); |
| |
| List<TSDataType> dataTypes = new ArrayList<>(); |
| if (outputEndTime) { |
| dataTypes.add(TSDataType.INT64); |
| } |
| for (Aggregator aggregator : aggregators) { |
| dataTypes.addAll(Arrays.asList(aggregator.getOutputType())); |
| } |
| this.resultTsBlockBuilder = new TsBlockBuilder(dataTypes); |
| |
| this.timeRangeIterator = timeRangeIterator; |
| this.outputEndTime = outputEndTime; |
| this.subTimeRangeIterator = initTimeRangeIterator(groupByTimeParameter, ascending, true); |
| } |
| |
| @Override |
| public boolean hasNext() throws Exception { |
| return curTimeRange != null || timeRangeIterator.hasNextTimeRange(); |
| } |
| |
| @SuppressWarnings("squid:S112") |
| @Override |
| protected boolean calculateNextAggregationResult() throws Exception { |
| if (curTimeRange == null && timeRangeIterator.hasNextTimeRange()) { |
| // Move to next time window |
| curTimeRange = timeRangeIterator.nextTimeRange(); |
| |
| // Clear previous aggregation result |
| for (Aggregator aggregator : aggregators) { |
| ((SlidingWindowAggregator) aggregator).updateTimeRange(curTimeRange); |
| } |
| } |
| |
| while (!isCalculationDone()) { |
| if (inputTsBlock == null) { |
| // NOTE: child.next() can only be invoked once |
| if (child.hasNextWithTimer() && canCallNext) { |
| inputTsBlock = child.nextWithTimer(); |
| canCallNext = false; |
| } else if (child.hasNextWithTimer()) { |
| // If child still has next but can't be invoked now |
| return false; |
| } else { |
| break; |
| } |
| } |
| |
| calculateFromCachedData(); |
| } |
| |
| // Update result using aggregators |
| updateResultTsBlock(); |
| |
| return true; |
| } |
| |
| /** return if already get the result. */ |
| private boolean isCalculationDone() { |
| if (curSubTimeRange == null) { |
| if (!subTimeRangeIterator.hasNextTimeRange()) { |
| return true; |
| } else { |
| curSubTimeRange = subTimeRangeIterator.nextTimeRange(); |
| } |
| } |
| |
| return ascending |
| ? curSubTimeRange.getMin() > curTimeRange.getMax() |
| : curSubTimeRange.getMax() < curTimeRange.getMin(); |
| } |
| |
| private void calculateFromCachedData() { |
| if (inputTsBlock == null || inputTsBlock.isEmpty()) { |
| return; |
| } |
| |
| for (Aggregator aggregator : aggregators) { |
| ((SlidingWindowAggregator) aggregator).processTsBlock(inputTsBlock); |
| } |
| |
| inputTsBlock = inputTsBlock.skipFirst(); |
| if (inputTsBlock.isEmpty()) { |
| inputTsBlock = null; |
| } |
| curSubTimeRange = null; |
| } |
| |
| @Override |
| protected void updateResultTsBlock() { |
| if (!outputEndTime) { |
| appendAggregationResult( |
| resultTsBlockBuilder, aggregators, timeRangeIterator.currentOutputTime()); |
| } else { |
| appendAggregationResult( |
| resultTsBlockBuilder, |
| aggregators, |
| timeRangeIterator.currentOutputTime(), |
| curTimeRange.getMax()); |
| } |
| curTimeRange = null; |
| } |
| } |