(copying a question and answer from the Clojurians Slack)
Are there any plans to expose an Arrow Flight API?
Yes! Although the exact roadmap/timeline is uncertain as it’s a non-trivial undertaking and there are undoubtedly many hard problems to figure out. However we do have some basics working & tested already in a (currently unsupported) module, see: xtdb/modules/flight-sql/src/test/clojure/xtdb/flight_sql_test.clj at 2.x · xtdb/xtdb · GitHub