adriangb commented on PR #19505:
URL: https://github.com/apache/datafusion/pull/19505#issuecomment-3696779084

   > Looking at the old API, it seems like you could previously override 
per-expression level nullability and other properties
   
   Yes but I don't think that was ever used? I get the feeling (based on actual 
usage) that the idea was more to allow creating a context with or without a 
schema, with or without a config, etc. But that is better suited to this 
builder style API than a trait.
   
   I see that `trait SimplifyInfo` was originally added in #1774. @jimexist I 
know it's been years since then but do you have any thoughts on it? I don't see 
any discussion on why it is a trait, etc.
   


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