About six months ago, I opened JDK-8338952 with a proposal to add an item comparator to (Tree)TableView.
The reason for this issue is that when using non-standard sorting — for example, when there is a "Total" row in the table — the standard API becomes insufficient. One has to reinvent the wheel, and the code quickly becomes extremely messy. Given that tables are one of the core UI components, this becomes a serious problem. To address this, I proposed adding an item comparator, which I believe would be very simple to implement. I suggest we at least discuss this issue so we can start moving toward a solution. Best regards, Pavel
