What do you mean by table view?  Are you talking about the list view or the graph view?  Since you mention reporting, I guess that you mean the new graph view (which is the default in most reporting view, and it opens by default in 'pivot' table mode).

Unfortunately, right now, columns (nor rows) can't be sorted.  This new view has a lot of power (you can pick and choose the data that you want to display), but it has some limitations as well.  However,  the graph view might someday be extended with that feature, but not for the next weeks.