lidavidm commented on code in PR #14244:
URL: https://github.com/apache/arrow/pull/14244#discussion_r983642958


##########
java/vector/src/main/codegen/templates/DenseUnionVector.java:
##########
@@ -940,4 +940,13 @@ public void setInitialCapacity(int valueCount, double 
density) {
       }
     }
   }
+
+  /**
+   * Set the element at the given index to null. For DenseUnionVector, it is a 
no-op as nulls are not supported at the
+   * top level, and isNull() always returns false. Nullability is only handled 
at the level of individual child vectors.

Review Comment:
   If it's possible to delegate we should (I still don't see the issue but 
haven't looked closely)



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