Is your feature request related to a problem or challenge?
We currently only test very basic FlightSQL functionality via a Ballista deployment in the integration tests.
Describe the solution you'd like
Test more complicated queries and more FlightSQL engines.
https://www.postgresql.org/about/news/apache-arrow-flight-sql-adapter-for-postgresql-010-2716/ looks like a fairly mature option.
Describe alternatives you've considered
No response
Additional context
No response