protected static class WindowClause.Window
Information about a window: the items making up the window, as well as the variables relating to the
start and end of the window, and the status of the winoow in relation to the processing of the current
Ask whether we have found the last item in the window
true if we have found the last item; false if we are still looking for it.
public boolean isDespatched()
Ask whether the tuple corresponding to this window has been despatched to the output tuple
stream. This does not always happen immediately the end item is determined, because tuples
corresponding to the various windows must be despached in order of their start items.
true if the tuple corresponding to this window has been despatched.