[python] table_constraints always empty calling to adbc_get_objects for Flight SQL source

[denodo-research-labs]

We are trying to use adbc_driver_flightsql (version 1.2.0) to access our Flight SQL interface, and we are having issues trying to obtain the primary keys (or any other type of constraints) via the table_constraints field of the result of:

objs = AdbcConnection.adbc_get_objects(depth="columns")

All table_constraints fields inside objs come as empty list, and we don't see our Flight SQL interface being asked for table constraints at all...

Is this not yet implemented for Flight SQL?

[lidavidm]

Hmm, it appears to not be wired up in the driver indeed.

[lidavidm]

It looks like the framework is there to build the result but what needs to be wired up between shared_utils.go and flightsql_connection.go is a way to inject a helper function to actually fetch and populate constraint info

[denodo-research-labs]

Should this be relabeled as a bug therefore?

[lidavidm]

I've relabeled it. I'm not sure if any contributors will pick this up but any help is welcome.