kaivalnp commented on code in PR #15979: URL: https://github.com/apache/lucene/pull/15979#discussion_r3659847822
########## lucene/core/src/java/org/apache/lucene/codecs/lucene106/dedup/DedupMergeContext.java: ########## @@ -0,0 +1,357 @@ +/* + * 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.lucene.codecs.lucene106.dedup; + +import static java.nio.ByteOrder.LITTLE_ENDIAN; +import static org.apache.lucene.codecs.lucene106.dedup.DedupUtil.ORD_UNKNOWN; +import static org.apache.lucene.codecs.lucene106.dedup.DedupUtil.alignBytes; +import static org.apache.lucene.codecs.lucene106.dedup.DedupUtil.hashBytes; +import static org.apache.lucene.codecs.lucene106.dedup.DedupUtil.writeEndOfFields; +import static org.apache.lucene.codecs.lucene106.dedup.DedupUtil.writeEndOfGroups; +import static org.apache.lucene.codecs.lucene106.dedup.DedupUtil.writeFieldInfo; +import static org.apache.lucene.codecs.lucene106.dedup.DedupUtil.writeGroupInfo; + +import java.io.IOException; +import java.nio.ByteBuffer; +import java.nio.FloatBuffer; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.stream.Collectors; +import org.apache.lucene.codecs.lucene106.dedup.DedupUtil.DedupVectorValues; +import org.apache.lucene.codecs.lucene106.dedup.DedupUtil.GroupInfo; +import org.apache.lucene.codecs.lucene106.dedup.DedupUtil.GroupKey; +import org.apache.lucene.codecs.lucene106.dedup.DedupUtil.OrdToVecOrd; +import org.apache.lucene.codecs.lucene106.dedup.DedupUtil.OrdToVecOrdArrayList; +import org.apache.lucene.codecs.lucene106.dedup.DedupUtil.WriteFieldInfo; +import org.apache.lucene.index.ByteVectorValues; +import org.apache.lucene.index.DocIDMerger; +import org.apache.lucene.index.DocsWithFieldSet; +import org.apache.lucene.index.FieldInfo; +import org.apache.lucene.index.FloatVectorValues; +import org.apache.lucene.index.KnnVectorValues; +import org.apache.lucene.index.MergeState; +import org.apache.lucene.index.VectorEncoding; +import org.apache.lucene.internal.hppc.IntArrayList; +import org.apache.lucene.internal.hppc.ObjectCursor; +import org.apache.lucene.store.IndexOutput; +import org.apache.lucene.util.Accountable; +import org.apache.lucene.util.IOSupplier; +import org.apache.lucene.util.RamUsageEstimator; + +/** + * Merges de-duplicated flat vectors from several segments. Fields sharing a {@link + * DedupUtil.GroupKey} are merged into one group: their vectors are streamed in merged doc order + * through a {@link DedupGroup}, so a vector is written the first time it is seen and later + * occurrences (within or across fields) reuse that group ordinal. Vectors originating from a dedup + * source are compared by ordinal to avoid reading them back. + * + * @lucene.experimental + */ +final class DedupMergeContext implements Accountable { + private static final long SHALLOW_SIZE = + RamUsageEstimator.shallowSizeOfInstance(DedupMergeContext.class); + private final List<FieldData> fieldDataList; + + DedupMergeContext() { + this.fieldDataList = new ArrayList<>(); + } + + @Override + public long ramBytesUsed() { + return SHALLOW_SIZE + fieldDataList.size() * FieldData.SHALLOW_SIZE; + } + + void addField(FieldInfo fieldInfo, MergeState mergeState) throws IOException { + fieldDataList.add( + new FieldData( + fieldInfo, + new GroupKey(fieldInfo), + new DocsWithFieldSet(), + new IntArrayList(), + getVectorMerger(fieldInfo, mergeState), + mergeState.segmentInfo.maxDoc())); + } + + void finish(IndexOutput meta, IndexOutput vectorData) throws IOException { + + // Evaluate compatible fields together for correct de-duplication + Map<GroupKey, List<FieldData>> fieldGroups = + fieldDataList.stream().collect(Collectors.groupingBy(FieldData::groupKey)); + + Map<GroupKey, Integer> groupOrds = new HashMap<>(); + int groupOrd = 0; + for (Map.Entry<GroupKey, List<FieldData>> entry : fieldGroups.entrySet()) { + GroupKey groupKey = entry.getKey(); + long vectorDataOffset = alignBytes(vectorData, groupKey.encoding()); + + DedupMergeGroup<?, ?> mergeGroup = + switch (groupKey.encoding()) { + case BYTE -> new ByteGroup(); + case FLOAT32 -> new FloatGroup(groupKey.dimension()); + }; + + for (FieldData fieldData : entry.getValue()) { + mergeGroup.processField(fieldData, vectorData); + } + + int dimension = groupKey.dimension(); Review Comment: Done! -- This is an automated message from the Apache Git Service. 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