Linq2Db:如何使用Sql.Ext.ListAgg函数？

using LinqToDB;
using LinqToDB.Data;
using LinqToDB.SqlQuery;

public class MyDataConnection : DataConnection
{
    public MyDataConnection() : base("MyConnectionString")
    {
    }

    public ITable<MyTable> MyTable => GetTable<MyTable>();
}

public class MyTable
{
    public int Id { get; set; }
    public string Name { get; set; }
}

public class Program
{
    public static void Main()
    {
        using (var db = new MyDataConnection())
        {
            var result = db.MyTable
                .GroupBy(x => x.Id)
                .Select(x => new
                {
                    Id = x.Key,
                    Names = Sql.Ext.ListAgg(x.Select(y => y.Name), ", ")
                })
                .ToList();
        }
    }
}