ALTER FOREIGN DATA WRAPPER — change the definition of a foreign-data wrapper
ALTER FOREIGN DATA WRAPPERname[ HANDLERhandler_function| NO HANDLER ] [ VALIDATORvalidator_function| NO VALIDATOR ] [ OPTIONS ( [ ADD | SET | DROP ]option['value'] [, ... ]) ] ALTER FOREIGN DATA WRAPPERnameOWNER TO {new_owner| CURRENT_USER | SESSION_USER } ALTER FOREIGN DATA WRAPPERnameRENAME TOnew_name
   ALTER FOREIGN DATA WRAPPER changes the
   definition of a foreign-data wrapper.  The first form of the
   command changes the support functions or the generic options of the
   foreign-data wrapper (at least one clause is required).  The second
   form changes the owner of the foreign-data wrapper.
  
Only superusers can alter foreign-data wrappers. Additionally, only superusers can own foreign-data wrappers.
nameThe name of an existing foreign-data wrapper.
HANDLER handler_functionSpecifies a new handler function for the foreign-data wrapper.
NO HANDLERThis is used to specify that the foreign-data wrapper should no longer have a handler function.
Note that foreign tables that use a foreign-data wrapper with no handler cannot be accessed.
VALIDATOR validator_functionSpecifies a new validator function for the foreign-data wrapper.
      Note that it is possible that pre-existing options of the foreign-data
      wrapper, or of dependent servers, user mappings, or foreign tables, are
      invalid according to the new validator.  PostgreSQL does
      not check for this.  It is up to the user to make sure that these
      options are correct before using the modified foreign-data wrapper.
      However, any options specified in this ALTER FOREIGN DATA
      WRAPPER command will be checked using the new validator.
     
NO VALIDATORThis is used to specify that the foreign-data wrapper should no longer have a validator function.
OPTIONS ( [ ADD | SET | DROP ] option ['value'] [, ... ] )
      Change options for the foreign-data
      wrapper.  ADD, SET, and DROP
      specify the action to be performed.  ADD is assumed
      if no operation is explicitly specified.  Option names must be
      unique; names and values are also validated using the foreign
      data wrapper's validator function, if any.
     
new_ownerThe user name of the new owner of the foreign-data wrapper.
new_nameThe new name for the foreign-data wrapper.
   Change a foreign-data wrapper dbi, add
   option foo, drop bar:
ALTER FOREIGN DATA WRAPPER dbi OPTIONS (ADD foo '1', DROP 'bar');
   Change the foreign-data wrapper dbi validator
   to bob.myvalidator:
ALTER FOREIGN DATA WRAPPER dbi VALIDATOR bob.myvalidator;
   ALTER FOREIGN DATA WRAPPER conforms to ISO/IEC
   9075-9 (SQL/MED), except that the HANDLER,
   VALIDATOR, OWNER TO, and RENAME
   clauses are extensions.