milenkovicm commented on PR #22415:
URL: https://github.com/apache/datafusion/pull/22415#issuecomment-4509820388

   Thats main point i'm trying to get across, it's a bit undefined whats 
expected from this method. please dont get me wrong I'm not trying to make a 
case this is not useful.
   I'm a bit confused how to handle df.54 upgrade, when it is safe to ignore 
it. 
   
   if `Ok(Continue)`  is undeterministic, is it the right return type ?
   
   > I share the same concern as @alamb that it would not be safe
   
   Can we mention in the upgrade guide in which cases this method is 
safe/unsafe to ignore ?
   
   


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