Ability to select entities in Criteria projections (#1471)

Fixes #948 (NH-3435)

Author: bahusoid

src/NHibernate.Test/Async/Criteria/EntityProjectionsTest.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+
+namespace NHibernate.Test.Criteria
+{
+	public class EntitySimpleChild
+	{
+		public virtual Guid Id { get; set; }
+		public virtual string Name { get; set; }
+	}
+
+	public class EntityComplex
+	{
+		public virtual Guid Id { get; set; }
+
+		public virtual int Version { get; set; }
+
+		public virtual string Name { get; set; }
+
+		public virtual string LazyProp { get; set; }
+
+		public virtual EntitySimpleChild Child1 { get; set; }
+		public virtual EntitySimpleChild Child2 { get; set; }
+		public virtual EntityComplex SameTypeChild { get; set; }
+
+		public virtual IList<EntitySimpleChild> ChildrenList { get; set; }
+	}
+
+	public class CompositeKey
+	{
+		public int Id1 { get; set; }
+		public int Id2 { get; set; }
+
+		public override bool Equals(object obj)
+		{
+			var key = obj as CompositeKey;
+			return key != null
+					&& Id1 == key.Id1
+					&& Id2 == key.Id2;
+		}
+
+		public override int GetHashCode()
+		{
+			var hashCode = -1596524975;
+			hashCode = hashCode * -1521134295 + Id1.GetHashCode();
+			hashCode = hashCode * -1521134295 + Id2.GetHashCode();
+			return hashCode;
+		}
+	}
+
+	public class EntityWithCompositeId
+	{
+		public virtual CompositeKey Key { get; set; }
+		public virtual string Name { get; set; }
+	}
+}