I'm a relatively new user that had the same question.
While it's true that the Row State Column was preserved after a I did a Table Join, the _actual_ Row States were cleared.
How can I make the _actual_ RowState of the new, joined table automatically update to reflect the information contained in the Row State Column?
(Note that I'm working in the interactive GUI, not JSL, and want to keep using only GUI, for now.)