Dandandan removed a comment on issue #1179:
URL: 
https://github.com/apache/arrow-datafusion/issues/1179#issuecomment-952966597


   Hey @alamb did you start working on this?
   I might otherwise check it out how this is handled - maybe before / in the 
weekend.
   
   In general - how this is usually defined in type theory - our `null` literal 
should be of type `⊤` a.k.a. `Any`, etc.
   https://en.wikipedia.org/wiki/Top_type .


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