Basically the only thing that Watermarks do is to trigger event time
timers. Event time timers are used explicitly in KeyedProcessFunctions, but
are also used internally by time windows, CEP (to sort the event stream),
in various time-based join operations, and within the Table/SQL API.
If you wan
> it is not clear to me if watermarks are also used by map/flatmpat
operators or just by window operators.
Watermarks are most liked only used by timing segmented aggregation
operator to trigger result materialization. In streaming, this “timing
segmentation” is usually called “windowing”, so in t
