Method ParseAggregateExpressionForPreview<TProps, TResult>(Expression<Func<RedbObject<TProps>, TResult>>)
Parses aggregate expression for preview (simplified version from RedbQueryable)
protected List<(string Alias, string FieldPath, string Function)> ParseAggregateExpressionForPreview<TProps, TResult>(Expression<Func<RedbObject<TProps>, TResult>> selector) where TProps : class, new()