alamb commented on PR #10042:
URL: https://github.com/apache/arrow-rs/pull/10042#issuecomment-4595534764

   Maybe @Jefffrey  was talking about 
   
   
https://github.com/apache/arrow-rs/blob/f1ef71aa5aab3d5f3e3ff46f63dd198cf5da7b38/arrow-schema/src/datatype.rs#L495-L507
   
   In the sense that it perhaps more likely for someone to be able to feed 
negative numbers in via SQL than via Rust APIs.
   
   So in this case case, `arrow_cast(..)` calls `DataType::try_from_str` which 
could potentially validate the `DataType` before return


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