mayya-sharipova commented on code in PR #992:
URL: https://github.com/apache/lucene/pull/992#discussion_r914172979


##########
lucene/core/src/java/org/apache/lucene/codecs/perfield/PerFieldKnnVectorsFormat.java:
##########
@@ -94,17 +95,61 @@ public KnnVectorsReader fieldsReader(SegmentReadState 
state) throws IOException
   private class FieldsWriter extends KnnVectorsWriter {
     private final Map<KnnVectorsFormat, WriterAndSuffix> formats;
     private final Map<String, Integer> suffixes = new HashMap<>();
+    private final Map<KnnVectorsWriter, Collection<String>> writersForFields =
+        new IdentityHashMap<>();
     private final SegmentWriteState segmentWriteState;
 
+    // if there is a single writer, cache it for faster indexing
+    private KnnVectorsWriter singleWriter;

Review Comment:
   Addressed in 2f58350081902bfc13cb02424343ab805c02b0a5



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