alamb commented on PR #9689:
URL: 
https://github.com/apache/arrow-datafusion/pull/9689#issuecomment-2013335579

   > I was targeting postgres with this as best as possible vs spark though 
null/empty testing was unfortunately not a big focus. I think the previous 
behavior (use default) was the spark behaviour - though that wasn't on purpose 
on my part.
   
   That makes sense -- thank you
   
   So in that case I do agree we should return `None` (aka NULL) when the 
format string is NULL. 


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