The TABLES_EXTENSIONS table provides
      information about table attributes defined for primary and
      secondary storage engines.
        The TABLES_EXTENSIONS table is
        reserved for future use.
      The TABLES_EXTENSIONS table has these
      columns:
- TABLE_CATALOG- The name of the catalog to which the table belongs. This value is always - def.
- TABLE_SCHEMA- The name of the schema (database) to which the table belongs. 
- TABLE_NAME- The name of the table. 
- ENGINE_ATTRIBUTE- Table attributes defined for the primary storage engine. Reserved for future use. 
- SECONDARY_ENGINE_ATTRIBUTE- Table attributes defined for the secondary storage engine. Reserved for future use.