52.23. pg_foreign_data_wrapper
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## 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

Column Type Description
`oid` oid Row identifier
`fdwname` name Name of the foreign-data wrapper
`fdwowner` oid (references pg_authid.`oid`) Owner of the foreign-data wrapper
`fdwhandler` oid (references 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 (references 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 Section 5.8 for details
`fdwoptions` text[] Foreign-data wrapper specific options, as “keyword=value” strings

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