jpountz commented on code in PR #13235:
URL: https://github.com/apache/lucene/pull/13235#discussion_r1544485782


##########
lucene/join/src/java/org/apache/lucene/search/join/DiversifyingChildrenByteKnnVectorQuery.java:
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@@ -140,6 +140,10 @@ protected TopDocs approximateSearch(
     if (collector == null) {
       return NO_RESULTS;
     }
+    if (context.reader().getByteVectorValues(field) == null) {

Review Comment:
   For my understanding, why do we only perform this validation when byte 
vector values are `null`?
   
   Also I wonder if we should move this code higher in the method, validation 
should still run even though the collector might be `null`?



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