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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2022/05/26 08:48:11 UTC
[GitHub] [iotdb] liuminghui233 commented on a diff in pull request #5986: [IOTDB-3081] Implementation of SlidingWindowAggregationOperator
liuminghui233 commented on code in PR #5986:
URL: https://github.com/apache/iotdb/pull/5986#discussion_r882457164
##########
server/src/main/java/org/apache/iotdb/db/mpp/aggregation/slidingwindow/SlidingWindowAggregator.java:
##########
@@ -0,0 +1,143 @@
+/*
+ * 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.mpp.aggregation.slidingwindow;
+
+import org.apache.iotdb.db.mpp.aggregation.Accumulator;
+import org.apache.iotdb.db.mpp.aggregation.Aggregator;
+import org.apache.iotdb.db.mpp.plan.planner.plan.parameter.AggregationStep;
+import org.apache.iotdb.db.mpp.plan.planner.plan.parameter.InputLocation;
+import org.apache.iotdb.tsfile.exception.write.UnSupportedDataTypeException;
+import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
+import org.apache.iotdb.tsfile.read.common.TimeRange;
+import org.apache.iotdb.tsfile.read.common.block.TsBlock;
+import org.apache.iotdb.tsfile.read.common.block.TsBlockBuilder;
+import org.apache.iotdb.tsfile.read.common.block.column.Column;
+import org.apache.iotdb.tsfile.read.common.block.column.ColumnBuilder;
+import org.apache.iotdb.tsfile.read.common.block.column.TimeColumn;
+
+import java.util.Arrays;
+import java.util.Deque;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+public abstract class SlidingWindowAggregator extends Aggregator {
+
+ // cached partial aggregation result of pre-aggregate windows
+ protected Deque<PartialAggregationResult> deque;
+
+ public SlidingWindowAggregator(
+ Accumulator accumulator, List<InputLocation[]> inputLocationList, AggregationStep step) {
+ super(accumulator, step, inputLocationList);
+ this.deque = new LinkedList<>();
+ }
+
+ @Override
+ public void processTsBlock(TsBlock tsBlock) {
+ checkArgument(
+ step.isInputPartial(),
+ "Step in SlidingWindowAggregationOperator can only process partial result");
+ TimeColumn timeColumn = tsBlock.getTimeColumn();
+ Column[] valueColumn = new Column[inputLocationList.get(0).length];
+ for (int i = 0; i < inputLocationList.get(0).length; i++) {
+ InputLocation inputLocation = inputLocationList.get(0)[i];
+ checkArgument(
+ inputLocation.getTsBlockIndex() == 0,
+ "SlidingWindowAggregationOperator can only process one tsBlock input.");
+ valueColumn[i] = tsBlock.getColumn(inputLocation.getValueColumnIndex());
+ }
+ processPartialResult(new PartialAggregationResult(timeColumn, valueColumn));
+ }
+
+ @Override
+ public void updateTimeRange(TimeRange curTimeRange) {
+ this.curTimeRange = curTimeRange;
+ evictingExpiredValue();
+ }
+
+ /** evicting expired element in queue and reset expired aggregateResult */
+ protected abstract void evictingExpiredValue();
+
+ /** update queue and aggregateResult */
+ public abstract void processPartialResult(PartialAggregationResult partialResult);
+
+ protected static class PartialAggregationResult {
+
+ private final TimeColumn timeColumn;
+ private final Column[] valueColumns;
Review Comment:
fixed
##########
server/src/main/java/org/apache/iotdb/db/mpp/aggregation/slidingwindow/NormalQueueSlidingWindowAggregator.java:
##########
@@ -0,0 +1,61 @@
+/*
+ * 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.mpp.aggregation.slidingwindow;
+
+import org.apache.iotdb.db.mpp.aggregation.Accumulator;
+import org.apache.iotdb.db.mpp.plan.planner.plan.parameter.AggregationStep;
+import org.apache.iotdb.db.mpp.plan.planner.plan.parameter.InputLocation;
+
+import java.util.List;
+
+/**
+ * When calculating MIN_TIME and FIRST_VALUE (MAX_TIME and LAST_VALUE in descending order), the
+ * aggregated result always appears at the head of the queue. We need to cache all pre-aggregated
+ * results in the queue.
+ */
+public class NormalQueueSlidingWindowAggregator extends SlidingWindowAggregator {
+
+ public NormalQueueSlidingWindowAggregator(
+ Accumulator accumulator, List<InputLocation[]> inputLocationList, AggregationStep step) {
+ super(accumulator, inputLocationList, step);
+ }
+
+ @Override
+ protected void evictingExpiredValue() {
+ while (!deque.isEmpty() && !curTimeRange.contains(deque.getFirst().getTime())) {
+ deque.removeFirst();
+ }
+ this.accumulator.reset();
+ if (!deque.isEmpty()) {
+ this.accumulator.addIntermediate(deque.getFirst().getPartialResult());
+ }
Review Comment:
fixed
##########
server/src/main/java/org/apache/iotdb/db/mpp/aggregation/slidingwindow/SmoothQueueSlidingWindowAggregator.java:
##########
@@ -0,0 +1,57 @@
+/*
+ * 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.mpp.aggregation.slidingwindow;
+
+import org.apache.iotdb.db.mpp.aggregation.Accumulator;
+import org.apache.iotdb.db.mpp.plan.planner.plan.parameter.AggregationStep;
+import org.apache.iotdb.db.mpp.plan.planner.plan.parameter.InputLocation;
+
+import java.util.List;
+
+/**
+ * The aggregation result is calculated from all pre-aggregation results in the currently maintained
+ * queue when calculating the COUNT, SUM, and AVG.
+ */
+public class SmoothQueueSlidingWindowAggregator extends SlidingWindowAggregator {
+ public SmoothQueueSlidingWindowAggregator(
+ Accumulator accumulator, List<InputLocation[]> inputLocationList, AggregationStep step) {
+ super(accumulator, inputLocationList, step);
+ }
+
+ @Override
+ protected void evictingExpiredValue() {
+ while (!deque.isEmpty() && !curTimeRange.contains(deque.getFirst().getTime())) {
+ PartialAggregationResult partialResult = deque.removeFirst();
+ if (deque.isEmpty()) {
+ this.accumulator.reset();
+ } else {
+ this.accumulator.addIntermediate(partialResult.opposite());
+ }
+ }
+ }
Review Comment:
fixed
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