benwtrent commented on code in PR #12922:
URL: https://github.com/apache/lucene/pull/12922#discussion_r1423943933


##########
lucene/core/src/java/org/apache/lucene/search/AbstractVectorSimilarityQuery.java:
##########
@@ -255,6 +255,11 @@ static VectorSimilarityScorer fromAcceptDocs(
           new FilteredDocIdSetIterator(acceptDocs) {
             @Override
             protected boolean match(int doc) throws IOException {
+              // Advance the scorer
+              if (!scorer.advanceExact(doc)) {
+                return false;
+              }
+

Review Comment:
   This tells me that none of the filtered cases drop to using exact search? If 
they did they would match on docs that were actually filtered out. 
   
   Could you add a test exercising this path?



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