foreign_data_wrappers
   The view foreign_data_wrappers contains all
   foreign-data wrappers defined in the current database.  Only those
   foreign-data wrappers are shown that the current user has access to
   (by way of being the owner or having some privilege).
  
Table 37.25. foreign_data_wrappers Columns
| Column Type Description | 
|---|
| 
        Name of the database that contains the foreign-data wrapper (always the current database) | 
| 
        Name of the foreign-data wrapper | 
| 
        Name of the owner of the foreign server | 
| 
        File name of the library that implementing this foreign-data wrapper | 
| 
        Language used to implement this foreign-data wrapper |