This optional parameter allows you to define the way Radiator
                  interprets the result of the GetSessionSelect
                  statement.
               You can specify any number of
                  GetSessionColumnDef parameters, one for each
                  interesting field returned by GetSessionSelect. The
                  general format is:
               GetSessionColumnDef n, dataitem
               
                  - nis the index of the field in the result of- GetSessionSelect.- 0is the first
                     field.
- dataitemis the name of a entry in the
                     subscriber information
The subscriber information entries required by the modules
                  shipped with Radiator policy and charging support use the following
                  information:
               
                  Table 15. Session information fetched from the GySession
                  
                     
                     
                     
                     
                        
                           | id | Index or other identifier that uniquely identifies this
                              session in the Gy Session | 
                        
                           | start_time | Unix timestamp for the session start | 
                        
                           | reserved_quota | Quota currently reserved for this session | 
                        
                           | subscription_id | Value of id identifying the subscriber as fetched by
                              OCSDB | 
                        
                           | session_id | Session-Idfor this Gy
                              session | 
                        
                           | imsi | IMSI for the
                              subscriber | 
                        
                           | nai | NAI for the
                              subscriber | 
                        
                           | e164 | E.164 formatted telephone number for the
                              subscriber |