| Name | Description | |
|---|---|---|
 | Finish | This method is called when iteration over data scope is finished.
Should be overridden in derived classes. |
| GetEmptyValue | This method is called when the list of aggregates values is empty. |
| Iterate | This method is called for each value in the data scope.
Should be overridden in derived classes. |
| Reset | This method is called when aggregate calculation starts.
Should be overridden in derived classes. |