findepi commented on issue #15394:
URL: https://github.com/apache/datafusion/issues/15394#issuecomment-3019419267

   > Nullability of Literal is not determined by surrounding context
   
   I wouldn't say that nullability of a literal is to be determined.
   Rather, if anything is tbd, it's UNION branches need to be 'coerced' to have 
same nullability.
   
   Let me update the title.
   


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