alessandrobenedetti commented on code in PR #3316:
URL: https://github.com/apache/solr/pull/3316#discussion_r2047275605


##########
solr/core/src/java/org/apache/solr/search/join/BlockJoinParentQParser.java:
##########
@@ -78,10 +93,127 @@ 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);
+      try {
+          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);
+            knnChildren = knnChildren.rewrite(req.getSearcher());
+            this.setAppropriateChildrenListingTransformer(req,knnChildren);
+            
+            return new ToParentBlockJoinQuery(
+                knnChildren, allParentsBitSet, 
ScoreModeParser.parse(scoreMode));
+          } else if (isFloatKnnQuery(childrenClauses)) {
+            BitSetProducer allParentsBitSet = getBitSetProducer(allParents);
+            BooleanQuery parentsFilter = getParentsFilter();
+      
+            KnnFloatVectorQuery knnChildrenQuery =
+                (KnnFloatVectorQuery) childrenClauses.get(0).getQuery();
+            String vectorField = knnChildrenQuery.getField();
+            float[] queryVector = knnChildrenQuery.getTargetCopy();
+            int topK = knnChildrenQuery.getK();
+      
+            Query childrenFilter =
+                getChildrenFilter(knnChildrenQuery.getFilter(), parentsFilter, 
allParentsBitSet);
+      
+            Query knnChildren =
+                new DiversifyingChildrenFloatKnnVectorQuery(
+                    vectorField, queryVector, childrenFilter, topK, 
allParentsBitSet);
+            knnChildren = knnChildren.rewrite(req.getSearcher());
+            this.setAppropriateChildrenListingTransformer(req,knnChildren);
+      
+            return new ToParentBlockJoinQuery(
+                knnChildren, allParentsBitSet, 
ScoreModeParser.parse(scoreMode));
+          } else {
+            return new AllParentsAware(
+                childrenQuery,
+                getBitSetProducer(allParents),
+                ScoreModeParser.parse(scoreMode),
+                allParents);
+          }
+      } catch (IOException e) {
+        throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
+      }

Review Comment:
   I just double checked and it's related to the searcher.rewrite and the 
searcher.getDocSet, they throw IOException, not sure how much we can comment 
here



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