PG_FOREIGN_DATA_WRAPPER
PG_FOREIGN_DATA_WRAPPER records foreign-data wrapper definitions. A foreign-data wrapper is the mechanism by which external data, residing on foreign servers, is accessed.
| Name | Type | Reference | 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. Its value is 0 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. Its value is 0 if no validator is provided. |
| fdwacl | aclitem[] | - | Access permissions |
| fdwoptions | text[] | - | Option used for foreign data wrappers. It is a keyword=value string. |
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