Re: [I] [C++][FS][Azure] Should `GetFileInfo()` against a directory always return true without hierarchical namespace support? [arrow]

["felipecrv (via GitHub)" <gi...@apache.org>]

felipecrv commented on issue #38772:
URL: https://github.com/apache/arrow/issues/38772#issuecomment-1820058342

   I thought a bit more about this idea and realized always returning `OK()` on "directory exists?" queries would contradict the post-condition of `DeleteDir()` – after `DeleteDir()` the caller expects `DirectoryExists()` to return `false`.
   
   I think our approach of doing nothing on `CreateDir` has to be reconsidered. `s3fs.cc` creates an empty object with a path ending in `/` to indicate a directory was created:
   
   ```cpp
     Status CreateEmptyDir(const std::string& bucket, const std::string& key) {
       DCHECK(!key.empty());
       return CreateEmptyObject(bucket, key + kSep);
     }
   ```


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