- 优化 MapRead 对 NULL 字段的处理；

FreeSql.Tests/FreeSql.Tests/UnitTest4.cs

@@ -10,6 +10,41 @@ namespace FreeSql.Tests
 {
     public class UnitTest4
     {
+        [Fact]
+        public void LeftJoinNull01()
+        {
+            var fsql = g.sqlite;
+            fsql.Delete<leftjoin_null01>().Where("1=1").ExecuteAffrows();
+            fsql.Delete<leftjoin_null02>().Where("1=1").ExecuteAffrows();
+
+            var item = new leftjoin_null01 { name = "xx01" };
+            fsql.Insert(item).ExecuteAffrows();
+
+            var sel1 = fsql.Select<leftjoin_null01, leftjoin_null02>()
+                .LeftJoin((a, b) => a.id == b.null01_id)
+                .First((a, b) => new
+                {
+                    a.id,
+                    a.name,
+                    id2 = (Guid?)b.id,
+                    time2 = (DateTime?)b.time
+                });
+            Assert.Null(sel1.id2);
+            Assert.Null(sel1.time2);
+        }
+
+        class leftjoin_null01
+        {
+            public Guid id { get; set; }
+            public string name { get; set; }
+        }
+        class leftjoin_null02
+        {
+            public Guid id { get; set; }
+            public Guid null01_id { get; set; }
+            public DateTime time { get; set; }
+        }
+
 
         [Fact]
         public void TestHzyTuple()