pitrou commented on issue #49740:
URL: https://github.com/apache/arrow/issues/49740#issuecomment-4304588261

   @AlenkaF Thanks for the analysis. I agree it's probably not ok to have null 
variadic buffers, we should instead resize the `buffers` in the cast kernel's 
output.
   
   We should also update our array validation routines to ensure that null 
variadic buffers don't pass validation (i.e., in the snippet above, 
`short.validate()` should fail but it currently succeeds).
   


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