pepijnve commented on PR #17813:
URL: https://github.com/apache/datafusion/pull/17813#issuecomment-3506701631

   > Now that being said, the current implementation isn't as precise as I 
described above either. Would it make sense to go for a more rigorous set based 
implementation or are you basically saying "don't bother, there's no chance 
we'll even consider this"?
   
   I went ahead and implemented this (mostly as a challenge for myself at this 
point). Right after completing this work I stumbled upon `NullableInterval`. 
That _could_ actually be used here as well, but I have to say that looks like a 
rather unergonomic type when all you're trying to do is model a set with three 
possible values.


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