uranusjr commented on a change in pull request #22491:
URL: https://github.com/apache/airflow/pull/22491#discussion_r834174737
##########
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:
Alternatively we could do
`session.query(func.count()).filter(...).scalar() > 0`, which is probably
slower, but still reasonable since the filtered columns are indexed, and
arguably most readable?
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