I'm happy to announce the release of Diesel 2.2.11 which contains a fix to disallow mixing aggregate and non-aggregate expressions in your DISTINCT ON clause and also improves some documentation around how to use the SQLite backend in a multi threaded application.
See https://github.com/diesel-rs/diesel/releases/tag/v2.2.11 for the full changelog.
As always you can support my work by contributing to Diesel or sponsoring me on GitHub.