We have this for some database, it's just a matter of adding the proper 
expression for your database engine. Here's how it's done on Presto:
https://github.com/apache/incubator-superset/blob/master/superset/db_engine_specs.py#L718

Which engine are you all interested in? Note that the key used in the 
`time_grain_functions` should match the ones defined here: 
https://github.com/apache/incubator-superset/blob/master/superset/db_engine_specs.py#L69-L72

[ Full content available at: 
https://github.com/apache/incubator-superset/issues/971 ]
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