Function aggregate_in_view 

pub fn aggregate_in_view(
    lmpg: &Lmpg,
    req: &AggregateRequest,
    snap: QuerySnapshot,
) -> Result<(Vec<GroupBucket>, u64), QueryError>

Aggregate execution over a caller-owned pinned read view. Embedded engines use this to keep every phase of a request on one snapshot and to apply the same deadline/budget context as the transport path.

Errors

Propagates storage, predicate, cancellation and aggregate resource errors.