Select improvements and alias parsing.

Insert evolved.

DynamORM.Tests/Select/DynamicAccessTests.cs

@@ -436,6 +436,29 @@ namespace DynamORM.Tests.Select
             Assert.AreEqual(exp.last, o.last);
         }
 
+        /// <summary>Test dynamic duplicate column name ocurrance.</summary>
+        [Test]
+        public void TestDuplicateColumnNameException()
+        {
+            Assert.Throws<ArgumentException>(() => GetTestBuilder()
+                .Where(x => x.id == 19)
+                .Select(x => new { id = x.id, first = x.first, last = x.last })
+                .Select(x => x.last.As(x.first)) // Make last be first
+                .Execute()
+                .First());
+        }
+
+        [Test]
+        public void TestEmptyColumnName()
+        {
+            var v = GetTestBuilder()
+                .Select(x => x.first, x => x.Count(x.first))
+                .GroupBy(x => x.first)
+                .OrderBy(x => x.Desc(2))
+                .Execute()
+                .ToList();
+        }
+
         #endregion Select
 
         #region Where