__rowid__ documentation

[McPo]

The requirement for __rowid__ is not well stated, I believe the __rowid__ column must be added to the Postgres Foreign Table, does it also have to be added to the Cassandra "table"?

Also when creating records, does the application have to provide a __rowid__, or is it provided by the FDW extension?

I currently have a __rowid__ added to both postgres and cassandra. However its a third party application that is interacting with the postgres db, therefore I wont be capable of supplying a __rowid__. In this situation, is it possible to utilise this FDW extension.

Cheers,
Emmet