yes. Just extend its dataModel and control the grouping on your own. data model usage sample (for true paggination) shown at richfaces-demo.
I've read the sample for rich:extendedDataTable, in that sample,
the value of rich:extendedDataTable has been bound to an
ExtendedTableDataModel, neither this class nor ExtendedTableDataModifiableModel has methods for handling grouping.
What kind of DataModel I should extend for handling grouping?
Thanks for your help.