I am planning on creating Ballista 0.9.0 RC1 this Friday, October 21st. Here is the tracking issue with a list of issues that I am hoping can be resolved by then.
https://github.com/apache/arrow-ballista/issues/273 Let me know (either here on the mailing list or in the issue) if there are additional items that you are working on that you would like to get into this release. If anyone has the time to help test and update documentation this week, it would be appreciated. Thanks, Andy.