kaivalnp commented on code in PR #951:
URL: https://github.com/apache/lucene/pull/951#discussion_r906440432


##########
lucene/core/src/java/org/apache/lucene/search/KnnVectorQuery.java:
##########
@@ -121,36 +120,50 @@ public Query rewrite(IndexReader reader) throws 
IOException {
     return createRewrittenQuery(reader, topK);
   }
 
-  private TopDocs searchLeaf(LeafReaderContext ctx, BitSetCollector 
filterCollector)
-      throws IOException {
+  private TopDocs searchLeaf(LeafReaderContext ctx, Weight filterWeight) 
throws IOException {
+    Bits liveDocs = ctx.reader().getLiveDocs();
+    int maxDoc = ctx.reader().maxDoc();
 
-    if (filterCollector == null) {
-      Bits acceptDocs = ctx.reader().getLiveDocs();
-      return approximateSearch(ctx, acceptDocs, Integer.MAX_VALUE);
+    if (filterWeight == null) {
+      return approximateSearch(ctx, liveDocs, Integer.MAX_VALUE);
     } else {
-      BitSetIterator filterIterator = filterCollector.getIterator(ctx.ord);
-      if (filterIterator == null || filterIterator.cost() == 0) {
+      Scorer scorer = filterWeight.scorer(ctx);
+      if (scorer == null) {
         return NO_RESULTS;
-      }
+      } else {
+        BitSetIterator filterIterator =
+            cacheIntoBitSetIterator(scorer.iterator(), liveDocs, maxDoc);
 
-      if (filterIterator.cost() <= k) {
-        // If there are <= k possible matches, short-circuit and perform exact 
search, since HNSW
-        // must always visit at least k documents
-        return exactSearch(ctx, filterIterator);
+        if (filterIterator.cost() <= k) {
+          return exactSearch(ctx, filterIterator);

Review Comment:
   Sure.. Makes sense!



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