alamb commented on issue #22989:
URL: https://github.com/apache/datafusion/issues/22989#issuecomment-4782072934

   FWIW some types, such as floats, likely don't make sense to implement 
DISTINCT for (as we found in https://github.com/apache/datafusion/pull/23084). 
   
   It would probably be good to review what other database implementations do 
before implementing it for datafusion


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