ephraimbuddy commented on a change in pull request #21273:
URL: https://github.com/apache/airflow/pull/21273#discussion_r813291001
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File path:
airflow/migrations/versions/7b2661a43ba3_taskinstance_keyed_to_dagrun.py
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@@ -337,7 +337,7 @@ def downgrade():
batch_op.drop_constraint('task_instance_pkey', type_='primary')
batch_op.alter_column('execution_date', existing_type=dt_type,
existing_nullable=True, nullable=False)
batch_op.alter_column(
- 'dag_id', existing_type=string_id_col_type,
existing_nullable=True, nullable=True
+ 'dag_id', existing_type=string_id_col_type,
existing_nullable=True, nullable=False
Review comment:
> So if dag_id wasn't nullable before, we don't need this line then?
It was nullable in Postgres, MySQL and SQLite but not in mssql
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