pub fn low_watermark<T: Ord + Copy + Named + 'static>() -> impl Accumulator<State = WatermarkUpdate<T>, Update = WatermarkUpdate<T>>Expand description
Accumulate the min value among the ranks, aka. low watermark, based on the ranks’ latest updates. Ranks’ previous updates are discarded, and not used in the min value calculation.
The main difference bwtween low wartermark accumulator and [MinAccumulator]
is, MinAccumulator takes previous updates into consideration too, and thus
returns the min of the whole history.