benwtrent commented on code in PR #12480:
URL: https://github.com/apache/lucene/pull/12480#discussion_r1281024474


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lucene/core/src/java/org/apache/lucene/util/hnsw/NeighborArray.java:
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@@ -111,6 +129,12 @@ public int[] sort() {
   private int insertSortedInternal() {

Review Comment:
   This obviates the need for any additional structures, if `score==-1` 
calculate via the method provided to `sort()`. Though it probably won't be  
`BiFunction<Integer, Integer, Float>` but instead a `Function<Integer, Float>` 
as only the caller will know which is the "current" node for the neighbor 
array. Or even better, a custom functional interface that works on native 
values `int -> float` this way we don't box the integer and scoring results 
unnecessarily.



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