lidavidm commented on PR #40436:
URL: https://github.com/apache/arrow/pull/40436#issuecomment-2002599955

   Hmm. 
   
   
https://github.com/apache/arrow/blob/b448b33808f2dd42866195fa4bb44198e2fc26b9/java/vector/src/main/java/org/apache/arrow/vector/ZeroVector.java#L28-L31
   
   @barronw I guess the optimization you wanted originally does exist, it's 
just a subclass of NulLVector...? That also means the check here isn't possible 
to do. (This is making every test fail. I didn't realize we had this.)


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