ashb commented on code in PR #74344:
URL: https://github.com/apache/airflow/pull/74344#discussion_r4208955585
##########
airflow-core/src/airflow/models/dynamic_region.py:
##########
@@ -78,3 +100,118 @@ class DynamicRegion(Base):
Index("idx_dynamic_region_slot", dag_id, run_id, node_id,
parent_region_id, parent_region_index),
Index("idx_dynamic_region_parent_region_id", parent_region_id),
)
+
+
+def resolve_current_producers(
+ *,
+ dag_id: str,
+ run_id: str,
+ task_id: str,
+ is_mapped: bool,
+ context: ProducerContext | None = None,
+ map_indexes: int | Collection[int] | None = None,
+ region_id: UUID | None = None,
+ region_index: int | None = None,
+ session: Session,
+) -> tuple[TaskInstance, ...]:
+ """Resolve the live producer task instances whose data the caller reads by
task instance UUID."""
+ from airflow.models.taskinstance import TaskInstance
+
+ if region_index is not None and region_id is None:
+ raise ValueError("region_index requires an explicit producer
region_id")
+ if context and context.previous_iteration and context.loop_node_id is None:
+ raise ValueError("Previous-iteration lookup requires a loop context")
+ query = select(TaskInstance).where(
+ TaskInstance.dag_id == dag_id,
+ TaskInstance.run_id == run_id,
+ TaskInstance.task_id == task_id,
+ TaskInstance.working_set.is_(True),
+ )
+ if region_id is not None:
+ query = query.where(TaskInstance.region_id == region_id)
+ if region_index is not None:
+ query = query.where(TaskInstance.region_index == region_index)
+ candidates = session.scalars(query).all()
Review Comment:
I'm going to look at fixing this via ` `WITH RECURSIVE` cte (works across
all 3 dbs)
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