martin-liu opened a new issue, #45857: URL: https://github.com/apache/arrow/issues/45857
### Describe the enhancement requested Currently, [pyarrow.fs.FileSystem.open_output_stream](https://arrow.apache.org/docs/python/generated/pyarrow.fs.FileSystem.html#pyarrow.fs.FileSystem.open_output_stream) supports [only predefined metadata](https://github.com/apache/arrow/blob/6b525b742a17acdb5a24bdc2d49111927af86279/cpp/src/arrow/filesystem/s3fs.cc#L1357-L1362). It should be enhanced to support custom metadata, such as `x-amz-meta-xxx` for S3 and `x-goog-meta-xxx` for Google Cloud Storage. ### Component(s) C++ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@arrow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
