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Support ORDER BY in window functions
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core/trino-main/src/main/java/io/trino/operator/aggregation/OrderedWindowAccumulator.java
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| /* | ||
| * Licensed 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 io.trino.operator.aggregation; | ||
|
|
||
| import com.google.common.collect.ImmutableList; | ||
| import io.trino.operator.PagesIndex; | ||
| import io.trino.operator.window.PagesWindowIndex; | ||
| import io.trino.spi.PageBuilder; | ||
| import io.trino.spi.block.BlockBuilder; | ||
| import io.trino.spi.block.ValueBlock; | ||
| import io.trino.spi.connector.SortOrder; | ||
| import io.trino.spi.function.WindowAccumulator; | ||
| import io.trino.spi.function.WindowIndex; | ||
| import io.trino.spi.type.Type; | ||
|
|
||
| import java.util.List; | ||
| import java.util.stream.IntStream; | ||
|
|
||
| import static com.google.common.base.Preconditions.checkState; | ||
| import static java.util.Objects.requireNonNull; | ||
|
|
||
| public class OrderedWindowAccumulator | ||
| implements WindowAccumulator | ||
| { | ||
| PagesIndex.Factory pagesIndexFactory; | ||
| private WindowAccumulator delegate; | ||
| private final WindowAccumulator initialDelegate; | ||
| private final List<Type> argumentTypes; | ||
| private final List<Integer> argumentChannels; | ||
| private final List<Integer> sortChannels; | ||
| private final List<SortOrder> sortOrders; | ||
|
|
||
| private PageBuilder pageBuilder; | ||
| private final PagesIndex pagesIndex; | ||
| private boolean pagesIndexSorted; | ||
|
|
||
| public OrderedWindowAccumulator( | ||
| PagesIndex.Factory pagesIndexFactory, | ||
| WindowAccumulator delegate, | ||
| List<Type> argumentTypes, | ||
| List<Integer> argumentChannels, | ||
| List<SortOrder> sortOrders) | ||
| { | ||
| this(pagesIndexFactory, delegate, argumentTypes, argumentChannels, sortOrders, pagesIndexFactory.newPagesIndex(argumentTypes, 10_000)); | ||
| } | ||
|
|
||
| private OrderedWindowAccumulator( | ||
| PagesIndex.Factory pagesIndexFactory, | ||
| WindowAccumulator delegate, | ||
| List<Type> argumentTypes, | ||
| List<Integer> argumentChannels, | ||
| List<SortOrder> sortOrders, | ||
| PagesIndex pagesIndex) | ||
| { | ||
| this.pagesIndexFactory = requireNonNull(pagesIndexFactory, "pagesIndexFactory is null"); | ||
| this.delegate = requireNonNull(delegate, "delegate is null"); | ||
| this.initialDelegate = delegate.copy(); | ||
| this.argumentTypes = requireNonNull(argumentTypes, "argumentTypes is null"); | ||
| this.argumentChannels = ImmutableList.copyOf(argumentChannels); | ||
| this.sortOrders = ImmutableList.copyOf(sortOrders); | ||
| this.pagesIndex = requireNonNull(pagesIndex, "pagesIndex is null"); | ||
| this.sortChannels = IntStream.range(argumentTypes.size() - sortOrders.size(), argumentChannels.size()) | ||
| .boxed() | ||
| .toList(); | ||
| resetPageBuilder(); | ||
| } | ||
|
|
||
| private void resetPageBuilder() | ||
| { | ||
| pageBuilder = new PageBuilder(argumentTypes); | ||
| } | ||
|
|
||
| @Override | ||
| public long getEstimatedSize() | ||
| { | ||
| return delegate.getEstimatedSize() + initialDelegate.getEstimatedSize() + pagesIndex.getEstimatedSize().toBytes() + pageBuilder.getRetainedSizeInBytes(); | ||
| } | ||
|
|
||
| @Override | ||
| public WindowAccumulator copy() | ||
| { | ||
| PagesIndex pagesIndexCopy = pagesIndexFactory.newPagesIndex(argumentTypes, pagesIndex.getPositionCount()); | ||
| pagesIndex.getPages().forEachRemaining(pagesIndexCopy::addPage); | ||
| return new OrderedWindowAccumulator(pagesIndexFactory, delegate.copy(), argumentTypes, argumentChannels, sortOrders, pagesIndexCopy); | ||
| } | ||
|
|
||
| @Override | ||
| public void addInput(WindowIndex index, int startPosition, int endPosition) | ||
| { | ||
| if (pagesIndexSorted) { | ||
| pagesIndexSorted = false; | ||
| // operate on delegate as of start | ||
| // nicer would be to add reset() method to WindowAccumulator but it requires reset method in each AccumulatorState class | ||
| delegate = initialDelegate.copy(); | ||
| } | ||
| // index is remapped so just go from 0 to argumentChannels.size() | ||
| for (int position = startPosition; position <= endPosition; position++) { | ||
| if (pageBuilder.isFull()) { | ||
| pagesIndex.addPage(pageBuilder.build()); | ||
| resetPageBuilder(); | ||
| } | ||
| for (int channel = 0; channel < argumentChannels.size(); channel++) { | ||
| ValueBlock value = index.getSingleValueBlock(channel, position).getSingleValueBlock(0); | ||
| pageBuilder.getBlockBuilder(channel).append(value, 0); | ||
| } | ||
| pageBuilder.declarePosition(); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public void output(BlockBuilder blockBuilder) | ||
| { | ||
| if (!pagesIndexSorted) { | ||
| if (!pageBuilder.isEmpty()) { | ||
| pagesIndex.addPage(pageBuilder.build()); | ||
| resetPageBuilder(); | ||
| } | ||
| int positionCount = pagesIndex.getPositionCount(); | ||
| if (positionCount == 0) { | ||
| return; | ||
| } | ||
| pagesIndex.sort(sortChannels, sortOrders); | ||
| WindowIndex sortedWindowIndex = new PagesWindowIndex(pagesIndex, 0, positionCount); | ||
| delegate.addInput(sortedWindowIndex, 0, positionCount - 1); | ||
| pagesIndexSorted = true; | ||
| } | ||
| checkState(pageBuilder.isEmpty()); | ||
|
|
||
| delegate.output(blockBuilder); | ||
| } | ||
| } |
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