[I] write_dataset with csv file format ignores delimiter [arrow]

["rohanjain101 (via GitHub)" <gi...@apache.org>]

rohanjain101 opened a new issue, #39961:
URL: https://github.com/apache/arrow/issues/39961

   ### Describe the bug, including details regarding any error messages, version, and platform.
   
   ```
   >>> ex = pa.Table.from_pydict({"A": ["A"], "B": ["B"], "C": ["C"]})
   >>> csv = pa.dataset.CsvFileFormat(pa.csv.ParseOptions(delimiter=">"))
   >>> pa.dataset.write_dataset(ex, path, format=csv, partitioning=pa.dataset.DirectoryPartitioning(pa.schema({"A": pa.string()})))
   >>>
   ```
   
   Output dataset contains:
   ```
   "B","C"
   "B","C"
   ```
   
   But I specified delimiter as ">", but csv file still written with "," delimiter.
   
   
   ### Component(s)
   
   C++, Python


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