collinoc opened a new pull request, #447:
URL: https://github.com/apache/arrow-rs-object-store/pull/447

   # Which issue does this PR close?
   
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   Closes #446.
   
   # Rationale for this change
    
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   Why are you proposing this change? If this is already explained clearly in 
the issue then this section is not needed.
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   Currently there seems to be no support for applying implementation specific 
attributes within this API. For example with a `aws_store.put_opts(...)` call, 
there would be no way to specify a [`x-amz-object-lock-mode` 
attribute](https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html#API_PutObject_RequestSyntax),
 or applying 
[`x-goog-storage-class`](https://cloud.google.com/storage/docs/xml-api/reference-headers#xgoogstorageclass)
 for a GCP put operation. This adds support for such use cases.
   
   # What changes are included in this PR?
   
   <!--
   There is no need to duplicate the description in the issue here but it is 
sometimes worth providing a summary of the individual changes in this PR.
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   Expands the `Attribute` enum to include a `Other` variant that will add 
headers with implementation specific prefixes (`x-amz-` for AWS, etc.)
   
   # Are there any user-facing changes?
   
   
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   If there are user-facing changes then we may require documentation to be 
updated before approving the PR.
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   Yes, documentation was updated where I thought needed. Let me know if more 
is needed.
   
   <!---
   If there are any breaking changes to public APIs, please call them out.
   -->
   
   These changes should be backwards compatible.
   


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