benwtrent commented on code in PR #14996:
URL: https://github.com/apache/lucene/pull/14996#discussion_r2251829915
##########
lucene/core/src/java/org/apache/lucene/search/AbstractKnnVectorQuery.java:
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@@ -214,7 +214,9 @@ private TopDocs getLeafResults(
// Perform the approximate kNN search
// We pass cost + 1 here to account for the edge case when we explore
exactly cost vectors
- TopDocs results = approximateSearch(ctx, acceptDocs, cost + 1,
timeLimitingKnnCollectorManager);
+ TopDocs results =
+ approximateSearch(
+ ctx, acceptDocs.asReadOnlyBits(), cost + 1,
timeLimitingKnnCollectorManager);
Review Comment:
Within the HNSW format, we do this:
```
if (acceptDocs instanceof BitSet bitSet) {
// Use approximate cardinality as this is good enough, but ensure we
don't exceed the graph
// size as that is illogical
filteredDocCount = Math.min(bitSet.approximateCardinality(),
graph.size());
if (unfilteredVisit >= filteredDocCount) {
doHnsw = false;
}
}
```
We determine the filter size via casting the `Bits` to `BitSet`. So, I am
not sure we can make this change without progressing:
https://github.com/apache/lucene/pull/15011
Or `bits` should give cardinality information...
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