The system catalog table pg_foreign_table contains auxiliary information about foreign tables. A foreign table is primarily represented by a pg_class entry, just like a regular table. Its pg_foreign_table entry contains the information that is pertinent only to foreign tables and not any other kind of relation.

    column type references description
    ftrelid oid pg_class.oid OID of the pg_class entry for this foreign table.
    ftserver oid pg_foreign_server.oid OID of the foreign server for this foreign table.
    ftoptions text[] Foreign table options, as “keyword=value” strings.

    Parent topic: System Catalogs Definitions