Add support for auto aliasing of anon type properties assigned by Sql.*

Author: mythz

src/ServiceStack.OrmLite/Expressions/SqlExpression.cs

@@ -1598,6 +1598,12 @@ private object SetAnonTypePropertyNamesForSelectExpression(object expr, Expressi
                 }
             }
 
+            var methodCallExpr = arg as MethodCallExpression;
+            var mi = methodCallExpr != null ? methodCallExpr.Method : null;
+            var declareType = mi != null && mi.DeclaringType != null ? mi.DeclaringType : null;
+            if (declareType != null && declareType.Name == "Sql" && mi.Name != "Desc" && mi.Name != "Asc" && mi.Name != "As") 
+                return new PartialSqlString(expr + " AS " + member.Name); // new { Count = Sql.Count("*") }
+
             return expr;
         }
 

tests/ServiceStack.OrmLite.Tests/UseCase/ArtistTrackSqlExpressions.cs

@@ -25,5 +25,24 @@ public void Can_OrderBy_Column_Index()
                 Assert.That(result[1993], Is.EqualTo(2));
             }
         }
+
+        [Test]
+        public void Can_Order_by_Property_Alias()
+        {
+            using (var db = CreateArtistAndTrackTablesWithData(OpenDbConnection()))
+            {
+                var q = db.From<Track>()
+                    .Where(x => x.Year > 1991)
+                    .And(x => x.Name.Contains("A"))
+                    .GroupBy(x => x.Year)
+                    .OrderByDescending("Count")
+                    .ThenBy(x => x.Year)
+                    .Take(1)
+                    .Select(x => new { x.Year, Count = Sql.Count("*") });
+
+                var result = db.Dictionary<int, int>(q);
+                Assert.That(result[1993], Is.EqualTo(2));
+            }
+        }
     }
 }