benwtrent commented on code in PR #14426:
URL: https://github.com/apache/lucene/pull/14426#discussion_r2027504697


##########
lucene/core/src/java/org/apache/lucene/codecs/KnnVectorsReader.java:
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@@ -130,4 +134,56 @@ public KnnVectorsReader getMergeInstance() {
    * <p>The default implementation is empty
    */
   public void finishMerge() throws IOException {}
+
+  /** A string representing the off-heap category for quantized vectors. */
+  public static final String QUANTIZED = "QUANTIZED";

Review Comment:
   >  I wonder if we should rather reflect the underlying format here. 
Something like flat_vector_float, flat_vector_byte, flat_vector_bbq?
   
   IMO, this is then transforming to just the codec format name as I would 
expect different formats to have different characteristics, even between 
versions....



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