uranusjr commented on a change in pull request #18421:
URL: https://github.com/apache/airflow/pull/18421#discussion_r713752452
##########
File path: airflow/models/dag.py
##########
@@ -1269,16 +1269,17 @@ def get_task_instances_before(
``base_date``, or more if there are manual task runs between the
requested period, which does not count toward ``num``.
"""
- min_date = (
- session.query(DagRun)
+ min_date: Optional[datetime] = (
+ session.query(DagRun.execution_date)
.filter(
DagRun.dag_id == self.dag_id,
DagRun.execution_date <= base_date,
DagRun.run_type != DagRunType.MANUAL,
)
.order_by(DagRun.execution_date.desc())
.offset(num)
- .first()
+ .limit(1)
+ .scalar()
Review comment:
Docs say `scalar()` fails if there’s more than one row
https://docs.sqlalchemy.org/en/14/orm/query.html#sqlalchemy.orm.Query.scalar
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