alamb commented on issue #3325:
URL: 
https://github.com/apache/arrow-datafusion/issues/3325#issuecomment-1236321165

   > Does the DataFrame API currently support unsigned integers? I suspect it 
does. If so supporting them within SQL seems reasonable to me, but I'm no SQL 
expert.
   
   The dataframe API itself is higher level and doesn't get into the level of 
DataTypes
   https://docs.rs/datafusion/11.0.0/datafusion/dataframe/struct.DataFrame.html
   
   The expressions API certainly does support all the arrow types (and thus 
unsigned). For example,  
https://docs.rs/datafusion/11.0.0/datafusion/prelude/fn.cast.html would allow 
you to cast to an unsigned int like:
   
   ```rust
   cast(input_expr, DataFusion::UInt64
   ```
   


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