EnricoMi commented on code in PR #46017:
URL: https://github.com/apache/arrow/pull/46017#discussion_r2037668281


##########
cpp/src/parquet/encryption/internal_file_encryptor.h:
##########
@@ -36,7 +36,7 @@ class ColumnEncryptionProperties;
 
 class PARQUET_EXPORT Encryptor {
  public:
-  Encryptor(encryption::AesEncryptor* aes_encryptor, const std::string& key,
+  Encryptor(encryption::AesEncryptor* aes_encryptor, const 
encryption::SecureString& key,
             const std::string& file_aad, const std::string& aad,
             ::arrow::MemoryPool* pool);

Review Comment:
   I think the rational here is that the value is being copied anyway, either 
from the `const T&`, or when calling by value. Your way does not hide that fact 
from the API.



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