xiedeyantu commented on PR #4933:
URL: https://github.com/apache/calcite/pull/4933#issuecomment-4427181306

   I attempted to verify this across several databases (though my testing may 
not have been exhaustive) and indeed found that only PostgreSQL supports this 
syntax; furthermore, `DISTINCT ON` does not appear to be part of the standard 
SQL specification. I would suggest implementing this within Babel 
(specifically, by adding a configuration parameter to control it); we can also 
wait to see if anyone else has any better suggestions.


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