HasMinMax
Result trait for accumulators that expose observed minimum and maximum values. Consumed by the Low and High AST nodes for min-max scaling and by any downstream that needs the observed range.
Implemented by com.eignex.kumulant.stat.summary.RangeResult and com.eignex.kumulant.stat.summary.SummaryResult. The pair of (min, max) extents that come back are over the entire observed stream; windowed views come from wrapping the underlying stat in a windowed operator.