[GitHub] [airflow] xinbinhuang commented on a change in pull request #9243: [AIP-34] Rewrite SubDagOperator

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xinbinhuang commented on a change in pull request #9243:
URL: https://github.com/apache/airflow/pull/9243#discussion_r439872489



##########
File path: airflow/models/task_group.py
##########
@@ -0,0 +1,31 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+from sqlalchemy import Column, ForeignKey, String
+
+from airflow.models.base import COLLATION_ARGS, ID_LEN, Base
+
+
+class TaskGroup(Base):
+    """
+    A task group per dag per task; grouping is rendered in the Graph/Tree view.

Review comment:
       Hi Ash,
   
   I am not familiar with the code on Serialized dag. Can you point me to the code that you are referring to?
   




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