akoshelev commented on issue #47435:
URL: https://github.com/apache/arrow/issues/47435#issuecomment-3238053391

   To add to this, our interpretation of section 
[4.3](https://parquet.apache.org/docs/file-format/data-pages/encryption/) 
Parquet encryption specification is that for keys fully managed by the caller 
code, metadata section is not required
   
   > Key metadata can also be empty - in a case the encryption keys are fully 
managed by the caller code, and passed explicitly to Parquet readers for the 
file footer and each encrypted column.
   
   So we were looking for ways to avoid providing dummy data for the purpose of 
using our own encryption keys
   


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