EnricoMi commented on code in PR #46017:
URL: https://github.com/apache/arrow/pull/46017#discussion_r2029078221


##########
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:
   And then move construct?
   ```
       : aes_encryptor_(aes_encryptor),
         key_(std::move(key)),
         file_aad_(std::move(file_aad)),
         aad_(std::move(aad)),
   ```
   Won't that copy the arguments when calling the constructor, or will that be 
optimized due to the `std::move`?



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