alamb commented on issue #4500:
URL: 
https://github.com/apache/arrow-datafusion/issues/4500#issuecomment-1336408979

   Currently the sqllogictest framework uses the arrow csv writer
   
   This we would need some way to control how NULLs are printed in the CSV 
writer  in order to change the display of null values to `"NULL"` -- I will 
attempt to upstream that.
   
   Rewriting `""` to `(empty)` is possible now


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