pitrou commented on PR #13442:
URL: https://github.com/apache/arrow/pull/13442#issuecomment-1171233258

   Well, there's no reason that 16MB is a "nice" value; it happens to work in 
your case and may not work in another case. 
   
   > I don't think we're going to address this in general without implementing 
JSON reading for which block size is not a user-facing concern.
   
   Right, so it doesn't make sense to change the default just to accomodate a 
particular use case without addressing the others, especially as the 
performance impact hasn't been researched. I recommend closing this PR.
   


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