53.23. 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 53.23. 
    
     pg_foreign_data_wrapper
    
    Columns
   
  
| 
        Column Type Description  | 
     
|---|
| 
        
         Row identifier  | 
     
| 
        
         Name of the foreign-data wrapper  | 
     
| 
        
         Owner of the foreign-data wrapper  | 
     
| 
        
         References a handler function that is responsible for supplying execution routines for the foreign-data wrapper. Zero if no handler is provided  | 
     
| 
        
         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  | 
     
| 
        
         Access privileges; see Section 5.7 for details  | 
     
| 
        
         Foreign-data wrapper specific options, as " keyword=value " strings  |