chenkovsky commented on PR #16824:
URL: https://github.com/apache/datafusion/pull/16824#issuecomment-3092159015

   another way is to add default aws config file, and set AWS_CONFIG_FILE env. 
But I found that s3_object_store_builder_default will fail,  on assert:
   
   ```rust
    assert_eq!(
             builder.get_config_value(&AmazonS3ConfigKey::SkipSignature),
             expected_skip_signature
         );
   ```
   
   maybe this assert is incorrect or there's a bug. 
   in current implementation, 
   ```rust
   if let Some(credentials) = credentials {
       let credentials = Arc::new(S3CredentialProvider { credentials });
       builder = builder.with_credentials(credentials);
   } else {
       debug!("No credentials found, defaulting to skip signature ");
       builder = builder.with_skip_signature(true);
   }
   ```
   If credentials are found, skip_signature won't be toggled on.
   But in test, if there are no AK and SK, skip_signature is expected to be 
toggled on.
   


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