msokolov commented on code in PR #14097:
URL: https://github.com/apache/lucene/pull/14097#discussion_r1905495877


##########
lucene/core/src/java/org/apache/lucene/util/hnsw/IncrementalHnswGraphMerger.java:
##########
@@ -63,41 +62,38 @@ public IncrementalHnswGraphMerger(
 
   /**
    * Adds a reader to the graph merger if it meets the following criteria: 1. 
Does not contain any
-   * deleted docs 2. Is a HnswGraphProvider/PerFieldKnnVectorReader 3. Has the 
most docs of any
-   * previous reader that met the above criteria
+   * deleted docs 2. Is a HnswGraphProvider 3. Has the most docs of any 
previous reader that met the
+   * above criteria
    */
   @Override
   public IncrementalHnswGraphMerger addReader(
       KnnVectorsReader reader, MergeState.DocMap docMap, Bits liveDocs) throws 
IOException {
-    KnnVectorsReader currKnnVectorsReader = reader;
-    if (reader instanceof PerFieldKnnVectorsFormat.FieldsReader 
candidateReader) {
-      currKnnVectorsReader = candidateReader.getFieldReader(fieldInfo.name);
+    if (!noDeletes(liveDocs) || !(reader instanceof HnswGraphProvider)) {

Review Comment:
   hah, true. Not sure where this came from - will change to `hasDeletes`. Q: 
is it truly necessary to check every bit of liveDocs? If we have a non-null 
liveDocs doesn't that imply one of the bits will be zero?



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