adamreeve opened a new pull request, #24866:
URL: https://github.com/apache/datafusion/pull/24866

   ## Which issue does this PR close?
   
   - Closes #21634.
   
   ## Rationale for this change
   
   Previously an error when retrieving the footer key was used as an indication 
that a key retriever was used, but this isn't reliable. A key retriever 
implementation might choose to return a footer key even if no key metadata is 
provided. This could mean that a footer key is set in the converted decryption 
properties but column keys are not correctly converted.
   
   arrow-rs didn't previously expose whether a key retriever is used, but this 
was added in 59.0.0.
   
   ## What changes are included in this PR?
   
   Use the  new `FileDecryptionProperties::uses_key_retriever` to determine 
whether `FileDecryptionProperties` uses a key retriever, rather than rely on 
getting an error when getting the footer key.
   
   ## What is the testing strategy for this PR?
   
   Updated existing unit test.
   
   ## Are there any user-facing changes?
   
   No, this changes an error message but should otherwise not affect users 
except if they had a key retriever implementation that would return footer keys 
without any metadata being provided.


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