adamreeve commented on PR #7387:
URL: https://github.com/apache/arrow-rs/pull/7387#issuecomment-2819908130

   I raised this issue at the recent Parquet sync (see notes at 
https://lists.apache.org/thread/qd6kd13mv19xcfkwn19vzlnd4zgxmyf3) and agreed 
with @alamb that this doesn't need to be part of arrow-rs and should instead be 
a standalone third-party crate, particularly as this isn't part of the official 
Parquet specification. I'll most-likely set up a repository for this in the 
@G-Research org.
   
   That doesn't rule out the possibility of integrating this into arrow-rs 
later if there's enough community demand for more official support for this 
feature, and available maintenance capacity.
   
   One loose end from this PR is the question of async KMS clients. That would 
require changes to arrow-rs, in particular adding an async version of the 
[`KeyRetriever`](https://github.com/apache/arrow-rs/blob/6a6c63123130f28c6f42544849bdebeb3e36531f/parquet/src/encryption/decrypt.rs#L102)
 trait. That's not a high priority for me right now but is something I'll try 
to come back to and address.


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