mayya-sharipova commented on code in PR #992:
URL: https://github.com/apache/lucene/pull/992#discussion_r919332844


##########
lucene/core/src/java/org/apache/lucene/codecs/perfield/PerFieldKnnVectorsFormat.java:
##########
@@ -102,9 +104,22 @@ private class FieldsWriter extends KnnVectorsWriter {
     }
 
     @Override
-    public void writeField(FieldInfo fieldInfo, KnnVectorsReader 
knnVectorsReader)
+    public KnnFieldVectorsWriter addField(FieldInfo fieldInfo) throws 
IOException {
+      KnnVectorsWriter writer = getInstance(fieldInfo);
+      return writer.addField(fieldInfo);
+    }
+
+    @Override
+    public void flush(int maxDoc, Sorter.DocMap sortMap) throws IOException {
+      for (WriterAndSuffix was : formats.values()) {
+        was.writer.flush(maxDoc, sortMap);
+      }
+    }
+
+    @Override
+    public void mergeOneField(FieldInfo fieldInfo, KnnVectorsReader 
knnVectorsReader)
         throws IOException {
-      getInstance(fieldInfo).writeField(fieldInfo, knnVectorsReader);
+      getInstance(fieldInfo).mergeOneField(fieldInfo, knnVectorsReader);

Review Comment:
   @jtibshirani  Thanks for the suggestion, but we can't at the same time make 
`KnnVectorsWriter#merge` final and also un-support  this `mergeOneField` in 
`PerFieldKnnVectorsFormat` as `KnnVectorsWriter#merge`  calls the corresponding 
`mergeOneField`. Should we keep `mergeOneField` and make 
`KnnVectorsWriter#merge` final as your other suggestion?



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