Hi,

Evaluating DO I tried to play with the future queries to reduce the number of round-trips to the database, but got an exception in a very simple scenario.

This is an example that reproduces the problem.

static void Test()
{
    var config = DomainConfiguration.Load("Default");
    var domain = Domain.Build(config);

    using (var session = domain.OpenSession())
    {
        using (var transactionScope = session.OpenTransaction())
        {
            Key key = Key.Create<Item>(domain, 1);
            var item = session.Query.ExecuteDelayed(x => x.Single<Item>(key));
        }
    }            
}

The problem though can be solved by the following code (which just doesn't look as straightforward as the example above):

var item = session.Query.ExecuteDelayed(x => x.All<Item>().Single(i => i.Key == key));