It is said in documentation, that
TreeTableView control is designed to visualize an unlimited number of rows of data
Unfortunately, I can't see any means for this in the doc.
All elements are stored in TreeItem<> classes and stored in memory. Although, one can implement "unlimitness" with ObservableList<> I see no way to implement this on nested observable lists.
"Unlimitness" require loading data by-demand, not storing it in memory.
So is it finally possible to display data on demand in TreeTableView?