routine_table_usage
   The view routine_table_usage is meant to identify all
   tables that are used by a function or procedure.  This information is
   currently not tracked by PostgreSQL.
  
Table 39.42. routine_table_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 39.45 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  |