yuqian90 commented on issue #7276: [AIRFLOW-5391] Add a new dependency rule to evaluate branching result URL: https://github.com/apache/airflow/pull/7276#issuecomment-583347659 @ashb @kaxil @feluelle @tooptoop4 Hoping to get a review here. I have updated the PR a bit. The logic is still the same, but the code that does the branching evaluation has been moved into a new dependency rule inside ``ti_deps/deps/branch_dep.py``. When `BranchDep` is evaluated, it sets the state of a task to "SKIPPED" if it has a parent that decided to skip it. For example, this comes from "example_short_circuit_operatorschedule":  For a DAG that looks like this, `condition_is_False` decided to skip `false_1`. Before this PR, the problem is if someone clears `false_1`, it'll execute. This is very counter-intuitive for users:   After this PR, when the scheduler evaluates the dependency rules for `false_1`, `BranchDep` will skip `false_1` because it knows that the parent task `condition_is_False` had already decided to skip `false_1`. In other words, this makes the "skipped" status "sticky". So after this PR, the DAG will look like this after someone clears `false_1`. This is much more intuitive: 
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