NH-4030 - fixing a latent bug in future revealed by previous refactoring.

Author: fredericDelaporte

src/NHibernate.Test/NHSpecificTest/Futures/FallbackFixture.cs

@@ -155,6 +155,21 @@ public void FutureValueOfLinqCanGetSingleEntityWhenQueryBatchingIsNotSupported()
 			}
 		}
 
+		[Test]
+		public void FutureValueWithSelectorOfLinqCanGetSingleEntityWhenQueryBatchingIsNotSupported()
+		{
+			var personId = CreatePerson();
+
+			using (var session = OpenSession())
+			{
+				var futurePerson = session
+					.Query<Person>()
+					.Where(x => x.Id == personId)
+					.ToFutureValue(q => q.FirstOrDefault());
+				Assert.IsNotNull(futurePerson.Value);
+			}
+		}
+
 		private int CreatePerson()
 		{
 			using (var session = Sfi.OpenSession())

src/NHibernate/Impl/AbstractQueryImpl.cs

@@ -886,7 +886,7 @@ public IEnumerable<T> Future<T>()
 		{
 			if (!session.Factory.ConnectionProvider.Driver.SupportsMultipleQueries)
 			{
-				return List<T>();
+				return new DelayedEnumerator<T>(List<T>);
 			}
 
 			session.FutureQueryBatch.Add<T>(this);