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Vectorized versions of HllSketch aggregators. (apache#11115)
* Vectorized versions of HllSketch aggregators. The patch uses the same "helper" approach as apache#10767 and apache#10304, and extends the tests to run in both vectorized and non-vectorized modes. Also includes some minor changes to the theta sketch vector aggregator: - Cosmetic changes to make the hll and theta implementations look more similar. - Extends the theta SQL tests to run in vectorized mode. * Updates post-code-review. * Fix javadoc.
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134
...apache/druid/query/aggregation/datasketches/hll/HllSketchBuildBufferAggregatorHelper.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. | ||
| */ | ||
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| package org.apache.druid.query.aggregation.datasketches.hll; | ||
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| import it.unimi.dsi.fastutil.ints.Int2ObjectMap; | ||
| import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap; | ||
| import org.apache.datasketches.hll.HllSketch; | ||
| import org.apache.datasketches.hll.TgtHllType; | ||
| import org.apache.datasketches.memory.WritableMemory; | ||
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| import java.nio.ByteBuffer; | ||
| import java.nio.ByteOrder; | ||
| import java.util.IdentityHashMap; | ||
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| public class HllSketchBuildBufferAggregatorHelper | ||
| { | ||
| private final int lgK; | ||
| private final int size; | ||
| private final IdentityHashMap<ByteBuffer, WritableMemory> memCache = new IdentityHashMap<>(); | ||
| private final IdentityHashMap<ByteBuffer, Int2ObjectMap<HllSketch>> sketchCache = new IdentityHashMap<>(); | ||
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| /** | ||
| * Used by {@link #init(ByteBuffer, int)}. We initialize by copying a prebuilt empty HllSketch image. | ||
| * {@link HllSketchMergeBufferAggregator} does something similar, but different enough that we don't share code. The | ||
| * "build" flavor uses {@link HllSketch} objects and the "merge" flavor uses {@link org.apache.datasketches.hll.Union} objects. | ||
| */ | ||
| private final byte[] emptySketch; | ||
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| public HllSketchBuildBufferAggregatorHelper(final int lgK, final TgtHllType tgtHllType, final int size) | ||
| { | ||
| this.lgK = lgK; | ||
| this.size = size; | ||
| this.emptySketch = new byte[size]; | ||
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| //noinspection ResultOfObjectAllocationIgnored (HllSketch writes to "emptySketch" as a side effect of construction) | ||
| new HllSketch(lgK, tgtHllType, WritableMemory.wrap(emptySketch)); | ||
| } | ||
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| /** | ||
| * Helper for implementing {@link org.apache.druid.query.aggregation.BufferAggregator#init} and | ||
| * {@link org.apache.druid.query.aggregation.VectorAggregator#init}. | ||
| */ | ||
| public void init(final ByteBuffer buf, final int position) | ||
| { | ||
| // Copy prebuilt empty sketch object. | ||
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| final int oldPosition = buf.position(); | ||
| try { | ||
| buf.position(position); | ||
| buf.put(emptySketch); | ||
| } | ||
| finally { | ||
| buf.position(oldPosition); | ||
| } | ||
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| // Add an HllSketch for this chunk to our sketchCache. | ||
| final WritableMemory mem = getMemory(buf).writableRegion(position, size); | ||
| putSketchIntoCache(buf, position, HllSketch.writableWrap(mem)); | ||
| } | ||
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| /** | ||
| * Helper for implementing {@link org.apache.druid.query.aggregation.BufferAggregator#get} and | ||
| * {@link org.apache.druid.query.aggregation.VectorAggregator#get}. | ||
| */ | ||
| public Object get(ByteBuffer buf, int position) | ||
| { | ||
| return sketchCache.get(buf).get(position).copy(); | ||
| } | ||
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| /** | ||
| * Helper for implementing {@link org.apache.druid.query.aggregation.BufferAggregator#relocate} and | ||
| * {@link org.apache.druid.query.aggregation.VectorAggregator#relocate}. | ||
| */ | ||
| public void relocate(int oldPosition, int newPosition, ByteBuffer oldBuf, ByteBuffer newBuf) | ||
| { | ||
| HllSketch sketch = sketchCache.get(oldBuf).get(oldPosition); | ||
| final WritableMemory oldMem = getMemory(oldBuf).writableRegion(oldPosition, size); | ||
| if (sketch.isSameResource(oldMem)) { // sketch has not moved | ||
| final WritableMemory newMem = getMemory(newBuf).writableRegion(newPosition, size); | ||
| sketch = HllSketch.writableWrap(newMem); | ||
| } | ||
| putSketchIntoCache(newBuf, newPosition, sketch); | ||
| } | ||
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| /** | ||
| * Retrieves the sketch at a particular position. | ||
| */ | ||
| public HllSketch getSketchAtPosition(final ByteBuffer buf, final int position) | ||
| { | ||
| return sketchCache.get(buf).get(position); | ||
| } | ||
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| /** | ||
| * Clean up resources used by this helper. | ||
| */ | ||
| public void clear() | ||
| { | ||
| memCache.clear(); | ||
| sketchCache.clear(); | ||
| } | ||
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| public int getLgK() | ||
| { | ||
| return lgK; | ||
| } | ||
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| private WritableMemory getMemory(final ByteBuffer buf) | ||
| { | ||
| return memCache.computeIfAbsent(buf, b -> WritableMemory.wrap(b, ByteOrder.LITTLE_ENDIAN)); | ||
| } | ||
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| private void putSketchIntoCache(final ByteBuffer buf, final int position, final HllSketch sketch) | ||
| { | ||
| final Int2ObjectMap<HllSketch> map = sketchCache.computeIfAbsent(buf, b -> new Int2ObjectOpenHashMap<>()); | ||
| map.put(position, sketch); | ||
| } | ||
| } |
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