gistfile1.cs

// this works                
var result = session.Query<MemberProfile>().Statistics(out stats).Skip(index).Take(200)
    .Select(p => new 
    {
        InvestorId = p.Id,
        SendPushNotification = p.NotificationSubscriberIds.Any()
    }).ToArray();
    
//this fails, with the following error message:
// Could not understand how to translate 'p.NotificationSubscriberIds.Any()' to a RavenDB query.
// Are you trying to do computation during the query?
// RavenDB doesn't allow computation during the query, computation is only allowed during index. Consider moving the operation to an index.
var result = session.Query<MemberProfile>().Statistics(out stats).Skip(index).Take(200)
    .Select(p => new InvestorPushDescription
    {
        InvestorId = p.Id,
        SendPushNotification = p.NotificationSubscriberIds.Any()
    }).ToArray();


public class InvestorPushDescription
{
    public string InvestorId { get; set; }
    public bool SendPushNotification { get; set; }

}