r2evans commented on issue #41618:
URL: https://github.com/apache/arrow/issues/41618#issuecomment-2105690679

   Huh, I swear I searched issues for "url" and "encode", don't know why I 
didn't see that. At least good to know I'm not the only one that finds it not 
obvious. I understand the issues with something like (e.g.) S3 and not allow 
spaces, which is why I  suggested at least _documenting it_. The necessary 
steps/hints in 
https://github.com/apache/arrow/issues/34905#issuecomment-1523744152 are really 
useful, though it seems less likely that somebody is going to be able and 
willing to alter the underlying C++ as well as R and python.
   
   An interesting (to me) note: despite requiring the url-encoding when writing 
the partitioning values, it does not require them when reading it. This means 
for my datamart, I can rename the directories immediately post-write (it's part 
of the datamart process anyway, for various reasons) and nobody is the wiser.
   
   Thanks.


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