pitrou commented on code in PR #40329:
URL: https://github.com/apache/arrow/pull/40329#discussion_r1532280405


##########
cpp/src/parquet/encryption/crypto_factory.cc:
##########
@@ -172,8 +199,8 @@ std::shared_ptr<FileDecryptionProperties> 
CryptoFactory::GetFileDecryptionProper
     const KmsConnectionConfig& kms_connection_config,
     const DecryptionConfiguration& decryption_config, const std::string& 
file_path,
     const std::shared_ptr<::arrow::fs::FileSystem>& file_system) {
-  auto key_retriever = std::make_shared<FileKeyUnwrapper>(
-      &key_toolkit_, kms_connection_config, 
decryption_config.cache_lifetime_seconds,

Review Comment:
   You can have `FileKeyUnwrapper` optionally take an owning pointer, but also 
leave the non-owning variant.



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