The Table item's interactive sorting is based on navigate to report actions which will cause the report to be re-processed and re-rendered, and thus all data retrieval method will be called again. If you need to allow users to interact with the data on screen, my suggestion is to use a grid control and its export options. Other approach is to use grid control to allow interaction with data s grouping, sorting, editing, and then load the same data in a report template built with the grouping and sorting settings of the grid.
There is no ETA for the feature yet. Please use the feedback portal
to raise the priority of the task by voting or logging a new request for it. Based on the demand and the required resources, features are selected for implementation.