ashb commented on a change in pull request #21019:
URL: https://github.com/apache/airflow/pull/21019#discussion_r792451766
##########
File path: airflow/models/baseoperator.py
##########
@@ -1800,6 +1801,73 @@ def wait_for_downstream(self) -> bool:
def depends_on_past(self) -> bool:
return self.partial_kwargs.get("depends_on_past") or
self.wait_for_downstream
+ def expand_mapped_task(self, upstream_ti: "TaskInstance", session:
"Session" = NEW_SESSION) -> None:
+ """Create the mapped TaskInstances for mapped task."""
+ # TODO: support having multiuple mapped upstreams?
+ from airflow.models.taskmap import TaskMap
+ from airflow.settings import task_instance_mutation_hook
+
+ task_map_info_length: Optional[int] = (
+ session.query(TaskMap.length)
+ .filter_by(
+ dag_id=upstream_ti.dag_id,
+ task_id=upstream_ti.task_id,
+ run_id=upstream_ti.run_id,
+ map_index=upstream_ti.map_index,
+ )
+ .scalar()
+ )
+ if task_map_info_length is None:
+ # TODO: What would lead to this? How can this be better handled?
+ raise RuntimeError("mapped operator cannot be expanded; upstream
not found")
+ # TODO: Add db constraint to ensure this is never negative.
+
+ unmapped_ti: Optional[TaskInstance] = (
+ session.query(TaskInstance)
+ .filter(
+ TaskInstance.dag_id == upstream_ti.dag_id,
+ TaskInstance.run_id == upstream_ti.run_id,
+ TaskInstance.task_id == self.task_id,
+ TaskInstance.map_index == -1,
+ TaskInstance.state.in_(State.unfinished),
+ )
+ .one_or_none()
+ )
+
+ if unmapped_ti:
+ # The unmapped task instance still exists and is unfinished, i.e.
we
+ # haven't tried to run it before.
+ if task_map_info_length < 1:
+ # If the upstream maps this to a zero-length value, simply
marked the
+ # unmapped task instance as SKIPPED (if needed).
+ unmapped_ti.state = TaskInstanceState.SKIPPED
Review comment:
Done.
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