postgres=# \d csv_branches
              Foreign table "public.csv_branches"
  Column  |     Type      | Modifiers |      FDW Options
----------+---------------+-----------+------------------------
 bid      | integer       | not null  | {force_not_null=false}
 bbalance | integer       |           | {force_not_null=true}
 filler   | character(88) |           |
Server: file_server

postgres=# \d+ csv_branches
                          Foreign table "public.csv_branches"
  Column  |     Type      | Modifiers |      FDW Options       | Storage  | Description
----------+---------------+-----------+------------------------+----------+-------------
 bid      | integer       | not null  | {force_not_null=false} | plain    |
 bbalance | integer       |           | {force_not_null=true}  | plain    |
 filler   | character(88) |           |                        | extended |
Server: file_server
Has OIDs: no