[GitHub] [lucene] jpountz commented on a diff in pull request #12064: Create new KnnByteVectorField and KnnVectorsReader#getByteVectorValues(String)

[GitBox <gi...@apache.org>]

jpountz commented on code in PR #12064:
URL: https://github.com/apache/lucene/pull/12064#discussion_r1061739690


##########
lucene/backward-codecs/src/java/org/apache/lucene/backward_codecs/lucene94/Lucene94HnswVectorsReader.java:
##########
@@ -233,12 +234,19 @@ public void checkIntegrity() throws IOException {
   @Override
   public VectorValues getVectorValues(String field) throws IOException {
     FieldEntry fieldEntry = fields.get(field);
-    VectorValues values = OffHeapVectorValues.load(fieldEntry, vectorData);
-    if (fieldEntry.vectorEncoding == VectorEncoding.BYTE) {
-      return new ExpandingVectorValues(values);
-    } else {
-      return values;
+    if (fieldEntry.vectorEncoding != VectorEncoding.FLOAT32) {
+      return null;
     }
+    return OffHeapVectorValues.load(fieldEntry, vectorData);
+  }
+
+  @Override
+  public ByteVectorValues getByteVectorValues(String field) throws IOException {
+    FieldEntry fieldEntry = fields.get(field);
+    if (fieldEntry.vectorEncoding != VectorEncoding.BYTE) {
+      return null;
+    }

Review Comment:
   this `if` statement should be unnecessary since CodecReader already checks field infos? Can we fail hard if the encoding is not right instead of returning null?



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