raulcd commented on issue #45702:
URL: https://github.com/apache/arrow/issues/45702#issuecomment-2706438083

   We use the AWS SDK and it seems this is already handled through the AWS SDK. 
From our code comment:
   
https://github.com/apache/arrow/blob/main/cpp/src/arrow/filesystem/s3fs.cc#L282-L289
   and from the AWS SDK CPP:
   
https://github.com/aws/aws-sdk-cpp/blob/9f6bfafbb9a82efe1c18e7d457fc97b848de3ee6/src/aws-cpp-sdk-core/source/auth/STSCredentialsProvider.cpp#L40
   
   Have you tried using the environment variable? Maybe is just a matter of 
updating the documentation to reflect that it can be defined?
   
   I have no experience with this part of the codebase but just for validation 
purposes.
   


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