Method GetTreeWindowSqlPreviewAsync<TProps>(TreeQueryContext<TProps>, IEnumerable<WindowFieldRequest>, IEnumerable<WindowFuncRequest>, IEnumerable<WindowFieldRequest>, IEnumerable<WindowOrderRequest>, string?)

Get SQL preview for tree window query.
Base implementation: returns placeholder, override in Pro for actual SQL.

public virtual Task<string> GetTreeWindowSqlPreviewAsync<TProps>(TreeQueryContext<TProps> context, IEnumerable<WindowFieldRequest> selectFields, IEnumerable<WindowFuncRequest> windowFuncs, IEnumerable<WindowFieldRequest> partitionBy, IEnumerable<WindowOrderRequest> orderBy, string? frameJson = null) where TProps : class, new()