uranusjr commented on code in PR #71737:
URL: https://github.com/apache/airflow/pull/71737#discussion_r4311955411
##########
airflow-core/src/airflow/models/dagrun.py:
##########
@@ -163,14 +164,51 @@ def validate_loop_decision(decision: str | None,
region_index: int, group: Seria
raise InvalidLoopDecision("Fixed-count loop decision does not match
its iteration limit")
+@dataclass(frozen=True, slots=True, eq=False)
+class FinishedTI:
+ """
+ Immutable view of a task instance in a terminal state.
+
+ Keeps the dag_run rescan lightweight and fast: scheduling only reads these
columns
+ off finished task instances, so a fully instrumented TaskInstance per row
is
+ unnecessary. ``task`` is attached from the serialized dag rather than the
row.
+
+ ``eq=False`` keeps the same identity-based equality and hashing a
TaskInstance has.
Review Comment:
This is not right, TaskInstance hash by key
https://github.com/apache/airflow/blob/2be399f1418bd20cf3b72d3036e33897633df2aa/airflow-core/src/airflow/models/taskinstance.py#L1321-L1322
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