Core Aggregation Operators
The 8 core ops cover the basic statistical primitives: counts, sums, central tendency, dispersion, and ratios.
All core ops are O(1) per-event memory and Tier 1 CPU. Lifetime mode is permitted for all 8.
Operators
| Op | Description |
|---|---|
bv.count |
Event count over a window or lifetime. |
bv.sum |
Numeric sum of a field. |
bv.mean |
Arithmetic mean of a field. (Renamed from avg per ADR-002.) |
bv.min |
Minimum value of a field. |
bv.max |
Maximum value of a field. |
bv.var |
Sample variance (Welford). (Renamed from variance.) |
bv.std |
Standard deviation. (Renamed from stddev.) |
bv.ratio |
Count matching predicate / total count. |
See also
- Operator catalog index — full 53-op catalogue
- cost-class.md — performance tier metadata
- Pipeline DSL compilation rules