Method ExecuteGroupedAggregateAsync(long, IEnumerable<GroupFieldRequest>, IEnumerable<AggregateRequest>, FilterExpression?)

⚡ Pro Override: GroupBy via PVT with FilterExpression (preferred).
Receives FilterExpression directly for proper SQL compilation.

public override Task<JsonDocument?> ExecuteGroupedAggregateAsync(long schemeId, IEnumerable<GroupFieldRequest> groupFields, IEnumerable<AggregateRequest> aggregations, FilterExpression? filter)