mapleFU commented on code in PR #39623:
URL: https://github.com/apache/arrow/pull/39623#discussion_r1454584992
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cpp/src/parquet/encryption/internal_file_decryptor.h:
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@@ -88,11 +89,10 @@ class InternalFileDecryptor {
const std::string& aad = "");
private:
+ std::mutex mutex_;
Review Comment:
I think the `mutex_` would better be `mutable`. and variable using it would
better adding a `GUARDED_BY` comment
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