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The catalog 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.
Table 48-25. pg_foreign_table Columns
||OID of the pg_class entry for this foreign table
||OID of the foreign server for this foreign table
||Foreign table options, as "keyword=value" strings