ashb commented on code in PR #46584:
URL: https://github.com/apache/airflow/pull/46584#discussion_r1948040226


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airflow/ti_deps/deps/not_previously_skipped_dep.py:
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@@ -49,46 +48,47 @@ def _get_dep_statuses(self, ti, session, dep_context):
         finished_task_ids = {t.task_id for t in finished_tis}
 
         for parent in upstream:
-            if isinstance(parent, SkipMixin):

Review Comment:
   Removing this makes the scheduler have to check this for all operators where 
it didn't before. 
   
   Given this is in the hottest of hot paths in the scheduler we might need to 
rethink this: perhaps we store a flag in the ser dag like we did for `is_empty`



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