thamht4190 commented on a change in pull request #8023:
URL: https://github.com/apache/arrow/pull/8023#discussion_r475668043



##########
File path: cpp/src/parquet/encryption.h
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@@ -47,15 +47,15 @@ using ColumnPathToEncryptionPropertiesMap =
 
 class PARQUET_EXPORT DecryptionKeyRetriever {
  public:
-  virtual std::string GetKey(const std::string& key_metadata) const = 0;

Review comment:
       Yes, I can do it. However, I don't understand why we must let it be 
`const` method. Can you please explain?




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