felipecrv commented on issue #40057:
URL: https://github.com/apache/arrow/issues/40057#issuecomment-1942120341

   We should probably NOT USE an encoding that would make the keys look totally 
opaque (like base64).
   
   A custom escaper that replaces `-` with `_` and back would work well if we 
forbid `_` in the metadata keys coming from the Arrow layer as every `_` stored 
in Azure Blobs would become `-` when surfaced to the `Arrow` users.


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