risdenk commented on code in PR #1255:
URL: https://github.com/apache/solr/pull/1255#discussion_r1061858513


##########
solr/core/src/java/org/apache/solr/core/SchemaCodecFactory.java:
##########
@@ -124,18 +124,18 @@ public KnnVectorsFormat 
getKnnVectorsFormatForField(String field) {
             if (fieldType instanceof DenseVectorField) {
               DenseVectorField vectorType = (DenseVectorField) fieldType;
               String knnAlgorithm = vectorType.getKnnAlgorithm();
-              if (knnAlgorithm != null) {
-                if (knnAlgorithm.equals(DenseVectorField.HNSW_ALGORITHM)) {
-                  int maxConn = vectorType.getHnswMaxConn();
-                  int beamWidth = vectorType.getHnswBeamWidth();
-                  return new Lucene94HnswVectorsFormat(maxConn, beamWidth);
-                }
+              if (knnAlgorithm.equals(DenseVectorField.HNSW_ALGORITHM)) {

Review Comment:
   nit the following will avoid any NPE if `knnAlgorithm` is ever null.: 
   ```suggestion
                 if (DenseVectorField.HNSW_ALGORITHM.equals(knnAlgorithm)) {
   ```



##########
solr/core/src/java/org/apache/solr/schema/DenseVectorField.java:
##########
@@ -104,7 +106,7 @@ public void init(IndexSchema schema, Map<String, String> 
args) {
             .orElse(DEFAULT_SIMILARITY);
     args.remove(KNN_SIMILARITY_FUNCTION);
 
-    this.knnAlgorithm = args.get(KNN_ALGORITHM);
+    this.knnAlgorithm = 
Optional.ofNullable(args.get(KNN_ALGORITHM)).orElse(DEFAULT_KNN_ALGORITHM);

Review Comment:
   use getOrDefault? 
https://docs.oracle.com/javase/8/docs/api/java/util/Map.html#getOrDefault-java.lang.Object-V-
   
   ```suggestion
       this.knnAlgorithm = args.getOrDefault(KNN_ALGORITHM, 
DEFAULT_KNN_ALGORITHM);
   ```



##########
solr/core/src/java/org/apache/solr/schema/DenseVectorField.java:
##########
@@ -104,7 +106,7 @@ public void init(IndexSchema schema, Map<String, String> 
args) {
             .orElse(DEFAULT_SIMILARITY);
     args.remove(KNN_SIMILARITY_FUNCTION);
 
-    this.knnAlgorithm = args.get(KNN_ALGORITHM);
+    this.knnAlgorithm = 
Optional.ofNullable(args.get(KNN_ALGORITHM)).orElse(DEFAULT_KNN_ALGORITHM);

Review Comment:
   This should cleanup the imports too.



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