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
|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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