Method GetGroupedWindowSqlPreviewAsync(long, IEnumerable<GroupFieldRequest>, IEnumerable<AggregateRequest>, IEnumerable<WindowFuncRequest>, IEnumerable<WindowFieldRequest>, IEnumerable<WindowOrderRequest>, FilterExpression?)
SQL preview for GroupBy + Window query with FilterExpression (Pro version).
Free fallback: converts FilterExpression to facet-JSON.
public virtual Task<string> GetGroupedWindowSqlPreviewAsync(long schemeId, IEnumerable<GroupFieldRequest> groupFields, IEnumerable<AggregateRequest> aggregations, IEnumerable<WindowFuncRequest> windowFuncs, IEnumerable<WindowFieldRequest> partitionBy, IEnumerable<WindowOrderRequest> orderBy, FilterExpression? filter)