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| 1 | +/* |
| 2 | + * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one |
| 3 | + * or more contributor license agreements. Licensed under the "Elastic License |
| 4 | + * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side |
| 5 | + * Public License v 1"; you may not use this file except in compliance with, at |
| 6 | + * your election, the "Elastic License 2.0", the "GNU Affero General Public |
| 7 | + * License v3.0 only", or the "Server Side Public License, v 1". |
| 8 | + */ |
| 9 | + |
| 10 | +package org.elasticsearch.index.mapper.blockloader.docvalues; |
| 11 | + |
| 12 | +import org.apache.lucene.index.DocValues; |
| 13 | +import org.apache.lucene.index.LeafReaderContext; |
| 14 | +import org.apache.lucene.index.SortedDocValues; |
| 15 | +import org.apache.lucene.index.SortedSetDocValues; |
| 16 | +import org.apache.lucene.util.BytesRef; |
| 17 | + |
| 18 | +import java.io.IOException; |
| 19 | + |
| 20 | +/** |
| 21 | + * Loads {@code keyword} style fields that are stored as a lookup table. |
| 22 | + */ |
| 23 | +abstract class AbstractBytesRefsFromOrdsBlockLoader extends BlockDocValuesReader.DocValuesBlockLoader { |
| 24 | + protected final String fieldName; |
| 25 | + |
| 26 | + AbstractBytesRefsFromOrdsBlockLoader(String fieldName) { |
| 27 | + this.fieldName = fieldName; |
| 28 | + } |
| 29 | + |
| 30 | + @Override |
| 31 | + public final BytesRefBuilder builder(BlockFactory factory, int expectedCount) { |
| 32 | + return factory.bytesRefs(expectedCount); |
| 33 | + } |
| 34 | + |
| 35 | + @Override |
| 36 | + public final AllReader reader(LeafReaderContext context) throws IOException { |
| 37 | + SortedSetDocValues docValues = context.reader().getSortedSetDocValues(fieldName); |
| 38 | + if (docValues != null) { |
| 39 | + SortedDocValues singleton = DocValues.unwrapSingleton(docValues); |
| 40 | + if (singleton != null) { |
| 41 | + return singletonReader(singleton); |
| 42 | + } |
| 43 | + return sortedSetReader(docValues); |
| 44 | + } |
| 45 | + SortedDocValues singleton = context.reader().getSortedDocValues(fieldName); |
| 46 | + if (singleton != null) { |
| 47 | + return singletonReader(singleton); |
| 48 | + } |
| 49 | + return new ConstantNullsReader(); |
| 50 | + } |
| 51 | + |
| 52 | + protected abstract AllReader singletonReader(SortedDocValues docValues); |
| 53 | + |
| 54 | + protected abstract AllReader sortedSetReader(SortedSetDocValues docValues); |
| 55 | + |
| 56 | + protected static class Singleton extends BlockDocValuesReader { |
| 57 | + private final SortedDocValues ordinals; |
| 58 | + |
| 59 | + Singleton(SortedDocValues ordinals) { |
| 60 | + this.ordinals = ordinals; |
| 61 | + } |
| 62 | + |
| 63 | + private Block readSingleDoc(BlockFactory factory, int docId) throws IOException { |
| 64 | + if (ordinals.advanceExact(docId)) { |
| 65 | + BytesRef v = ordinals.lookupOrd(ordinals.ordValue()); |
| 66 | + // the returned BytesRef can be reused |
| 67 | + return factory.constantBytes(BytesRef.deepCopyOf(v), 1); |
| 68 | + } else { |
| 69 | + return factory.constantNulls(1); |
| 70 | + } |
| 71 | + } |
| 72 | + |
| 73 | + @Override |
| 74 | + public Block read(BlockFactory factory, Docs docs, int offset, boolean nullsFiltered) throws IOException { |
| 75 | + if (docs.count() - offset == 1) { |
| 76 | + return readSingleDoc(factory, docs.get(offset)); |
| 77 | + } |
| 78 | + if (ordinals instanceof OptionalColumnAtATimeReader direct) { |
| 79 | + Block block = direct.tryRead(factory, docs, offset, nullsFiltered, null, false); |
| 80 | + if (block != null) { |
| 81 | + return block; |
| 82 | + } |
| 83 | + } |
| 84 | + try (var builder = factory.singletonOrdinalsBuilder(ordinals, docs.count() - offset, false)) { |
| 85 | + for (int i = offset; i < docs.count(); i++) { |
| 86 | + int doc = docs.get(i); |
| 87 | + if (ordinals.advanceExact(doc)) { |
| 88 | + builder.appendOrd(ordinals.ordValue()); |
| 89 | + } else { |
| 90 | + builder.appendNull(); |
| 91 | + } |
| 92 | + } |
| 93 | + return builder.build(); |
| 94 | + } |
| 95 | + } |
| 96 | + |
| 97 | + @Override |
| 98 | + public void read(int docId, StoredFields storedFields, Builder builder) throws IOException { |
| 99 | + if (ordinals.advanceExact(docId)) { |
| 100 | + ((BytesRefBuilder) builder).appendBytesRef(ordinals.lookupOrd(ordinals.ordValue())); |
| 101 | + } else { |
| 102 | + builder.appendNull(); |
| 103 | + } |
| 104 | + } |
| 105 | + |
| 106 | + @Override |
| 107 | + public int docId() { |
| 108 | + return ordinals.docID(); |
| 109 | + } |
| 110 | + |
| 111 | + @Override |
| 112 | + public String toString() { |
| 113 | + return "BytesRefsFromOrds.Singleton"; |
| 114 | + } |
| 115 | + } |
| 116 | + |
| 117 | + protected static class SortedSet extends BlockDocValuesReader { |
| 118 | + private final SortedSetDocValues ordinals; |
| 119 | + |
| 120 | + SortedSet(SortedSetDocValues ordinals) { |
| 121 | + this.ordinals = ordinals; |
| 122 | + } |
| 123 | + |
| 124 | + @Override |
| 125 | + public Block read(BlockFactory factory, Docs docs, int offset, boolean nullsFiltered) throws IOException { |
| 126 | + if (docs.count() - offset == 1) { |
| 127 | + return readSingleDoc(factory, docs.get(offset)); |
| 128 | + } |
| 129 | + try (var builder = factory.sortedSetOrdinalsBuilder(ordinals, docs.count() - offset)) { |
| 130 | + for (int i = offset; i < docs.count(); i++) { |
| 131 | + int doc = docs.get(i); |
| 132 | + if (doc < ordinals.docID()) { |
| 133 | + throw new IllegalStateException("docs within same block must be in order"); |
| 134 | + } |
| 135 | + if (ordinals.advanceExact(doc) == false) { |
| 136 | + builder.appendNull(); |
| 137 | + continue; |
| 138 | + } |
| 139 | + int count = ordinals.docValueCount(); |
| 140 | + if (count == 1) { |
| 141 | + builder.appendOrd(Math.toIntExact(ordinals.nextOrd())); |
| 142 | + } else { |
| 143 | + builder.beginPositionEntry(); |
| 144 | + for (int c = 0; c < count; c++) { |
| 145 | + builder.appendOrd(Math.toIntExact(ordinals.nextOrd())); |
| 146 | + } |
| 147 | + builder.endPositionEntry(); |
| 148 | + } |
| 149 | + } |
| 150 | + return builder.build(); |
| 151 | + } |
| 152 | + } |
| 153 | + |
| 154 | + @Override |
| 155 | + public void read(int docId, StoredFields storedFields, Builder builder) throws IOException { |
| 156 | + read(docId, (BytesRefBuilder) builder); |
| 157 | + } |
| 158 | + |
| 159 | + private Block readSingleDoc(BlockFactory factory, int docId) throws IOException { |
| 160 | + if (ordinals.advanceExact(docId) == false) { |
| 161 | + return factory.constantNulls(1); |
| 162 | + } |
| 163 | + int count = ordinals.docValueCount(); |
| 164 | + if (count == 1) { |
| 165 | + BytesRef v = ordinals.lookupOrd(ordinals.nextOrd()); |
| 166 | + return factory.constantBytes(BytesRef.deepCopyOf(v), 1); |
| 167 | + } |
| 168 | + try (var builder = factory.bytesRefsFromDocValues(count)) { |
| 169 | + builder.beginPositionEntry(); |
| 170 | + for (int c = 0; c < count; c++) { |
| 171 | + BytesRef v = ordinals.lookupOrd(ordinals.nextOrd()); |
| 172 | + builder.appendBytesRef(v); |
| 173 | + } |
| 174 | + builder.endPositionEntry(); |
| 175 | + return builder.build(); |
| 176 | + } |
| 177 | + } |
| 178 | + |
| 179 | + private void read(int docId, BytesRefBuilder builder) throws IOException { |
| 180 | + if (false == ordinals.advanceExact(docId)) { |
| 181 | + builder.appendNull(); |
| 182 | + return; |
| 183 | + } |
| 184 | + int count = ordinals.docValueCount(); |
| 185 | + if (count == 1) { |
| 186 | + builder.appendBytesRef(ordinals.lookupOrd(ordinals.nextOrd())); |
| 187 | + return; |
| 188 | + } |
| 189 | + builder.beginPositionEntry(); |
| 190 | + for (int v = 0; v < count; v++) { |
| 191 | + builder.appendBytesRef(ordinals.lookupOrd(ordinals.nextOrd())); |
| 192 | + } |
| 193 | + builder.endPositionEntry(); |
| 194 | + } |
| 195 | + |
| 196 | + @Override |
| 197 | + public int docId() { |
| 198 | + return ordinals.docID(); |
| 199 | + } |
| 200 | + |
| 201 | + @Override |
| 202 | + public String toString() { |
| 203 | + return "BytesRefsFromOrds.SortedSet"; |
| 204 | + } |
| 205 | + } |
| 206 | +} |
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