pub fn aggregate(
lmpg: &Lmpg,
req: &AggregateRequest,
) -> Result<Vec<GroupBucket>, QueryError>Expand description
Branch-grain aggregation over a BindingRelation of distinct roots:
one root contributes exactly one binding row, independent branches are
filtered existentially rather than multiplied into flat rows.
ยงErrors
Propagates storage/engine read errors and predicate evaluation failures as
QueryError.