ashb commented on a change in pull request #7276: [AIRFLOW-5391] Do not run 
skipped tasks when they are cleared
URL: https://github.com/apache/airflow/pull/7276#discussion_r379324932
 
 

 ##########
 File path: airflow/ti_deps/deps/branch_dep.py
 ##########
 @@ -0,0 +1,63 @@
+#
+# 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 airflow.ti_deps.deps.base_ti_dep import BaseTIDep
+
+
+class BranchDep(BaseTIDep):
+    """
+    Determines if any of the task's direct upstream relatives have decided 
this task should
+    be skipped.
+    """
+    NAME = "Branch Rule"
+    IGNORABLE = True
+    IS_TASK_DEP = True
+
+    def _get_dep_statuses(self, ti, session, dep_context=None):
+        from airflow.models.skipmixin import SkipMixin
+        from airflow.utils.state import State
+
+        upstream = ti.task.get_direct_relatives(upstream=True)
+
+        finished_tasks = dep_context.finished_tasks if dep_context else None
+        if finished_tasks is None:
+            # this is for the strange feature of running tasks without dag_run
+            finished_tasks = ti.task.dag.get_task_instances(
+                start_date=ti.execution_date,
+                end_date=ti.execution_date,
+                state=State.finished() + [State.UPSTREAM_FAILED],
+                session=session)
+
+        finished_task_ids = {t.task_id for t in finished_tasks}
+
+        for parent in upstream:
+            if isinstance(parent, SkipMixin):
+                xcom_value = ti.xcom_pull(task_ids=parent.task_id)
 
 Review comment:
   Oh - to start with I thought this was Xcom of false_1 etc, not of the 
skipping operator.
   
   Let me look at this again.

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