[GitHub] [airflow] pingzh commented on a change in pull request #22491: Add ignore_first_depends_on_past for scheduled jobs

[GitBox <gi...@apache.org>]

pingzh commented on a change in pull request #22491:
URL: https://github.com/apache/airflow/pull/22491#discussion_r834500764



##########
File path: airflow/ti_deps/deps/prev_dagrun_dep.py
##########
@@ -66,6 +67,23 @@ def _get_dep_statuses(self, ti, session, dep_context):
 
         previous_ti = last_dagrun.get_task_instance(ti.task_id, session=session)
         if not previous_ti:
+            if ti.task.ignore_first_depends_on_past:
+                historical_ti = (
+                    session.query(TI)
+                    .filter(
+                        TI.dag_id == ti.dag_id,
+                        TI.task_id == ti.task_id,
+                        TI.execution_date < ti.execution_date,
+                    )
+                    .first()
+                )

Review comment:
       good idea. I have tried to use `exist` but some db does not support that. let me update it




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