Update jon 2 sql bug

Src/Asp.NetCore2/SqlSugar/Json2Sql/Provider/Queryable/AppendJoin.cs

@@ -16,12 +16,33 @@ namespace SqlSugar
             bool isJoin = true;
             var value = item.First().ToString();
             var obj = context.Utilities.JsonToJoinModels(value);
-            sugarQueryable.AddJoinInfo(obj.TableName, obj.ShortName, obj.OnWhereList, obj.JoinType);
-            AddTableInfos(obj.TableName,obj.ShortName);
+            sugarQueryable.AddJoinInfo(obj.TableName, obj.ShortName, obj.OnWhereList, GetJoinType(item));
+            AddTableInfos(obj.TableName, obj.ShortName);
             AfterJoin();
             return isJoin;
         }
 
+        private static JoinType GetJoinType(JToken obj)
+        {
+            var key = obj.Path.ToLower();
+            if (key.Contains("right"))
+            {
+                return JoinType.Right;
+            }
+            else if (key.Contains("left"))
+            {
+                return JoinType.Left;
+            }
+            else if (key.Contains("full"))
+            {
+                return JoinType.Full;
+            }
+            else
+            {
+                return JoinType.Inner;
+            }
+        }
+
         private void AfterJoin()
         {