wgtmac commented on code in PR #40732:
URL: https://github.com/apache/arrow/pull/40732#discussion_r1535013937


##########
cpp/src/parquet/encryption/file_key_unwrapper.cc:
##########
@@ -30,33 +30,37 @@ FileKeyUnwrapper::FileKeyUnwrapper(
     const std::string& file_path,
     const std::shared_ptr<::arrow::fs::FileSystem>& file_system)
     : FileKeyUnwrapper(std::move(key_toolkit), /*key_toolkit=*/nullptr,
-                       kms_connection_config, cache_lifetime_seconds, 
file_path,
-                       file_system) {}
+                       kms_connection_config, cache_lifetime_seconds,
+                       /*key_material_store=*/nullptr, file_path, file_system) 
{}
 
 FileKeyUnwrapper::FileKeyUnwrapper(
     KeyToolkit* key_toolkit, const KmsConnectionConfig& kms_connection_config,
     double cache_lifetime_seconds, const std::string& file_path,
     const std::shared_ptr<::arrow::fs::FileSystem>& file_system)
     : FileKeyUnwrapper(/*key_toolkit_owner=*/nullptr, key_toolkit, 
kms_connection_config,
-                       cache_lifetime_seconds, file_path, file_system) {}
+                       cache_lifetime_seconds, /*key_material_store=*/nullptr, 
file_path,
+                       file_system) {}
 
 FileKeyUnwrapper::FileKeyUnwrapper(
     KeyToolkit* key_toolkit, const KmsConnectionConfig& kms_connection_config,
     double cache_lifetime_seconds,
     std::shared_ptr<FileKeyMaterialStore> key_material_store)
     : FileKeyUnwrapper(/*key_toolkit_owner=*/nullptr, key_toolkit, 
kms_connection_config,
-                       cache_lifetime_seconds, /*file_path=*/"",
+                       cache_lifetime_seconds, std::move(key_material_store),

Review Comment:
   It seems that FileKeyMaterialStore is only required when master key rotation 
is used. Otherwise it is null and created internally based on file path and 
file system.



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