kaxil commented on a change in pull request #9973:
URL: https://github.com/apache/airflow/pull/9973#discussion_r614169008
##########
File path: airflow/models/serialized_dag.py
##########
@@ -114,14 +114,17 @@ def write_dag(cls, dag: DAG, min_update_interval:
Optional[int] = None, session:
# If Yes, does nothing
# If No or the DAG does not exists, updates / writes Serialized DAG to
DB
if min_update_interval is not None:
- if session.query(
- exists().where(
+ if (
+ session.query(literal(True))
+ .filter(
and_(
cls.dag_id == dag.dag_id,
(timezone.utcnow() -
timedelta(seconds=min_update_interval)) < cls.last_updated,
)
)
- ).scalar():
+ .first()
+ is not None
Review comment:
why this change, scalar() is not DB specific is it? or sqlalchmey does
not convert it well too?
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