liangkaiwen commented on code in PR #3316:
URL: https://github.com/apache/solr/pull/3316#discussion_r2033397396


##########
solr/core/src/java/org/apache/solr/search/join/BlockJoinParentQParser.java:
##########
@@ -78,10 +87,89 @@ protected Query noClausesQuery() throws SyntaxError {
     return new BitSetProducerQuery(getBitSetProducer(parseParentFilter()));
   }
 
-  protected Query createQuery(final Query parentList, Query query, String 
scoreMode)
+  protected Query createQuery(final Query allParents, BooleanQuery 
childrenQuery, String scoreMode)
       throws SyntaxError {
-    return new AllParentsAware(
-        query, getBitSetProducer(parentList), 
ScoreModeParser.parse(scoreMode), parentList);
+    List<BooleanClause> childrenClauses = childrenQuery.clauses();
+    if (isByteKnnQuery(childrenClauses)) {
+      BitSetProducer allParentsBitSet = getBitSetProducer(allParents);
+      BooleanQuery parentsFilter = getParentsFilter();
+
+      KnnByteVectorQuery knnChildrenQuery = (KnnByteVectorQuery) 
childrenClauses.get(0).getQuery();
+      String vectorField = knnChildrenQuery.getField();
+      byte[] queryVector = knnChildrenQuery.getTargetCopy();
+      int topK = knnChildrenQuery.getK();
+
+      Query acceptedChildren =
+          getChildrenFilter(knnChildrenQuery.getFilter(), parentsFilter, 
allParentsBitSet);
+
+      Query knnChildren =
+          new DiversifyingChildrenByteKnnVectorQuery(
+              vectorField, queryVector, acceptedChildren, topK, 
allParentsBitSet);
+      return new ToParentBlockJoinQuery(
+          knnChildren, allParentsBitSet, ScoreModeParser.parse(scoreMode));
+    } else if (isFloatKnnQuery(childrenClauses)) {

Review Comment:
   is the branching on type of Knn query necessary? As far as I can see, the 
majority of the code blocks are equivalent and the different instance variables 
of KnnByteVectorQuery/KnnFloatVectorQuery are being used like its generic 
parent class



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