benesch commented on issue #6285:
URL: https://github.com/apache/arrow-rs/issues/6285#issuecomment-2456400218

   I put up https://github.com/apache/arrow-rs/pull/6682, which implements both 
`PutMode::Create` and `copy_if_not_exists` for native Amazon S3. I'm unfamiliar 
with the maintainership for `object_store` so if someone can tag in the right 
folks to review, I'd be much obliged!
   
   > After playing around a bit, I found out that this can be worked around 
just by using multipart copy:
   > 
   > 1. Initiate Multipart Upload
   > 2. Upload Part Copy
   > 3. Supply `if-none-match` to Complete Multipart Upload
   
   @fhilgers thanks for the pointer here. Indeed that seems to work as expected.


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