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.
| || || ||OID of the |
| || || ||OID of the foreign server for this foreign table|
| || ||Foreign table options, as "keyword=value" strings|
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