52.23. 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 52.23. 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