jimczi commented on code in PR #13370:
URL: https://github.com/apache/lucene/pull/13370#discussion_r1602010896


##########
lucene/core/src/java/org/apache/lucene/codecs/hnsw/ScalarQuantizedVectorScorer.java:
##########
@@ -165,6 +169,15 @@ public float score(int node) throws IOException {
       };
     }
 
+    @Override
+    public float score(int firstOrd, int secondOrd) throws IOException {
+      return similarity.score(
+          values.vectorValue(firstOrd),

Review Comment:
   Same here, this instance should be reserved since it is used by the 
`scorer(int ord)` case?



##########
lucene/core/src/java/org/apache/lucene/codecs/hnsw/DefaultFlatVectorScorer.java:
##########
@@ -109,6 +109,12 @@ public float score(int node) throws IOException {
       };
     }
 
+    @Override
+    public float score(int firstOrd, int secondOrd) throws IOException {
+      return similarityFunction.compare(
+          vectors1.vectorValue(firstOrd), vectors2.vectorValue(secondOrd));

Review Comment:
   vectors1 instance is already used by the `scorer(int ord)` case. If we want 
to allow this I believe we need a third copy.



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