You might be able to argue that Postgres' foreign data is a different form of pluggable storage engine. E.g. you can even use a CSV file as a backing store for

You might be able to argue that Postgres' foreign data is a different form of pluggable storage engine. E.g. you can even use a CSV file as a backing store for a table with file_fdw. https://www.postgresql.org/docs/current/ddl-foreign-data.html https://www.postgresql.org/docs/current/ddl-foreign-data.htm... https://dbaclass.com/article/how-to-access-csv-files-on-file-system-using-file_fdw_in_postgres/ https://dbaclass.com/article/how-to-access-csv-files-on-file...