jpountz commented on code in PR #11938:
URL: https://github.com/apache/lucene/pull/11938#discussion_r1023992252


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lucene/core/src/java/org/apache/lucene/codecs/KnnVectorsWriter.java:
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@@ -108,7 +108,7 @@ public int nextDoc() throws IOException {
   protected static class MergedVectorValues extends VectorValues {
     private final List<VectorValuesSub> subs;
     private final DocIDMerger<VectorValuesSub> docIdMerger;
-    private final int cost;
+    private final long cost;

Review Comment:
   I pushed a commit with what I had in mind. Essentially `cost()` and `size()` 
are the same thing on vectors except that the latter is expected to be 
accurate. Maybe we should rethink this, e.g. could `cost()` be required to be 
accurate on `VectorValues` instances, or could the base class make `cost()` 
final and delegate to `size()`?



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