49.23. pg_foreign_data_wrapper
The catalog pg_foreign_data_wrapper stores foreign-data wrapper definitions. A foreign-data wrapper is the mechanism by which external data, residing on foreign servers, is accessed.
Table 49-23. pg_foreign_data_wrapper Columns
| Name | Type | References | Description |
|---|---|---|---|
oid | oid | Row identifier (hidden attribute; must be explicitly selected) | |
fdwname | name | Name of the foreign-data wrapper | |
fdwowner | oid | pg_authid.oid | Owner of the foreign-data wrapper |
fdwhandler | oid | pg_proc.oid | References a handler function that is responsible for supplying execution routines for the foreign-data wrapper. Zero if no handler is provided |
fdwvalidator | oid | pg_proc.oid | References a validator function that is responsible for checking the validity of the options given to the foreign-data wrapper, as well as options for foreign servers and user mappings using the foreign-data wrapper. Zero if no validator is provided |
fdwacl | aclitem[] | Access privileges; see GRANT and REVOKE for details | |
fdwoptions | text[] | Foreign-data wrapper specific options, as "keyword=value" strings |
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https://www.postgresql.org/docs/9.5/catalog-pg-foreign-data-wrapper.html