The table sql_packages contains information
   about which feature packages defined in the SQL standard are
   supported by PostgreSQL.  Refer to Appendix D for background information on feature packages.
  
Table 32-33. sql_packages Columns
| Name | Data Type | Description | 
|---|
| feature_id | character_data | Identifier string of the package | 
| feature_name | character_data | Descriptive name of the package | 
| is_supported | character_data | YES if the package is fully supported by the
       current version of PostgreSQL, NO if not | 
| is_verified_by | character_data | Always null, since the PostgreSQL development group does not
       perform formal testing of feature conformance | 
| comments | character_data | Possibly a comment about the supported status of the package |