villebro edited a comment on issue #5467: Fix broken dedup and remove redundant 
db_spec logic
URL: 
https://github.com/apache/incubator-superset/pull/5467#issuecomment-407129024
 
 
   @mistercrunch The lowercasing hack was introduced to deal with SQLA engines 
that returned different cases for column names in the cursor.description (db 
api 1) which was used by e.g. SQL Lab and ResultProxy.keys() (db api 2), which 
was used for retrieving data. #5178 replaced all v2 api calls with v1 calls, 
ensuring that the column names are always of the same case.

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