routine_column_usage #
   The view routine_column_usage identifies all columns
   that are used by a function or procedure, either in the SQL body or in
   parameter default expressions.  (This only works for unquoted SQL bodies,
   not quoted bodies or functions in other languages.)  A column is only
   included if its table is owned by a currently enabled role.
  
Table 35.38. routine_column_usage Columns
| Column Type Description | 
|---|
| 
        Name of the database containing the function (always the current database) | 
| 
        Name of the schema containing the function | 
| 
        The “specific name” of the function. See Section 35.45 for more information. | 
| 
        Name of the database containing the function (always the current database) | 
| 
        Name of the schema containing the function | 
| 
        Name of the function (might be duplicated in case of overloading) | 
| 
        Name of the database that contains the table that is used by the function (always the current database) | 
| 
        Name of the schema that contains the table that is used by the function | 
| 
        Name of the table that is used by the function | 
| 
        Name of the column that is used by the function |