alamb commented on issue #1710:
URL: 
https://github.com/apache/arrow-datafusion/issues/1710#issuecomment-1039201175


   Thanks @OscarTHZhang . Note that as @mkmik  points out, we haven't changed 
how identifiers are named from csv files. So if your CSV file has a column 
named `Foo` to query it you will have to use `"Foo"`. `foo` will not work. 
   
   > This issue however is about a CSV file that has a header that contains 
non-lowercased column names, and the expectation that datafusion will make them 
referenceable using lowercase identifiers.
   
   


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