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

⚡ Pro Override: GroupBy via PVT with filterJson (legacy compatibility).
Note: filterJson is ignored in Pro - use FilterExpression overload.

public override Task<JsonDocument?> ExecuteGroupedAggregateAsync(long schemeId, IEnumerable<GroupFieldRequest> groupFields, IEnumerable<AggregateRequest> aggregations, string? filterJson = null)