As I can see there is no Trigger Rule what can differentiate failed and upstream_failed statuses. We have to behave differently when the parent has run but failed and when it has not run at all.
When the status of the parent task is:
- sucecess -> run the child task
- failed -> run the child task
- upstream_failed -> skip the child task
- skipped -> skip the child task
How can we get this behaviour?
Is it possible to write custom trigger rule for this?
I'm mostly interested in answer for Airflow 1.x
