Module models 

Structs

AggPlan

Validated GROUP BY plan: canonical group columns + resolved aggregations.

AggSpec

One resolved aggregation, ready for SQL emission.

Aggregation

A single aggregation in a group_by query.

CountRequest

Body for POST /api/datasets/{name}/count. Predicates are optional — an empty body (or {}) counts every row in the dataset.

OrderBy

A single ORDER BY clause entry.

Predicate

QueryRequest

Enums

AggOp