ephraimbuddy commented on a change in pull request #21462:
URL: https://github.com/apache/airflow/pull/21462#discussion_r804896684
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File path: airflow/models/taskinstance.py
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@@ -386,6 +385,7 @@ class TaskInstance(Base, LoggingMixin):
Index('ti_pool', pool, state, priority_weight),
Index('ti_job_id', job_id),
Index('ti_trigger_id', trigger_id),
+ Index('ti_map_index', dag_id, task_id, run_id, map_index, unique=True),
Review comment:
I'm currently blocked by how to get the dialect name of a database in
the ORM and decide whether to add an index or not
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