ChrisHegarty commented on code in PR #14426:
URL: https://github.com/apache/lucene/pull/14426#discussion_r2028417528


##########
lucene/core/src/java/org/apache/lucene/codecs/lucene102/Lucene102BinaryQuantizedVectorsReader.java:
##########
@@ -257,6 +259,19 @@ public long ramBytesUsed() {
     return size;
   }
 
+  @Override
+  public Map<String, Long> getOffHeapByteSize(FieldInfo fieldInfo) {
+    Objects.requireNonNull(fieldInfo);
+    var raw = rawVectorsReader.getOffHeapByteSize(fieldInfo);
+    var fieldEntry = fields.get(fieldInfo.name);
+    if (fieldEntry == null) {
+      assert fieldInfo.getVectorEncoding() == VectorEncoding.BYTE;

Review Comment:
   I did think that too, however both this format and the ScalarQuantizedFormat 
can be used directly with bytes - in which case there is no auto-quantization, 
just a byte vector store.



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