Module agg_key 

Canonical aggregate key generation.

A single source of truth for naming aggregate output fields. Used by the SQL planner (HAVING filter field names) and the Data Plane aggregate handler (result row keys).

Examples: canonical_agg_key("count", "*") → "count(*)" canonical_agg_key("sum", "price") → "sum(price)" canonical_agg_key("avg", "score") → "avg(score)"

Functions

canonical_agg_key

Build the canonical key for an aggregate result field.