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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