51.23. 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 51.23. 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/10/catalog-pg-foreign-data-wrapper.html