gianm commented on issue #9416: COALESCE does not work with empty strings as 
documentation states it would
URL: https://github.com/apache/druid/issues/9416#issuecomment-591712374
 
 
   > would it be possible to change the behaviour of LOOKUPS such that a key 
miss evaluates to NULL rather than an empty string?
   
   That's a good point and seems pretty reasonable. I think it's actually 
already like that in SQL-compliant null handling mode. So maybe in that mode 
things already work like you expect. It would be good to exercise this case in 
any unit tests we add while working on this issue.

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