ashb opened a new pull request, #74407:
URL: https://github.com/apache/airflow/pull/74407
The downgrade refused whenever XCom_v2 or rendered field data had rows, or
any task retried since the upgrade, so a rollback after any real use of 3.4
was impossible.
This fixes it, as long as the data can be downgraded non-destructively
"as if 3.3 wrote it". This means you might loose data that 3.3 wouldn't
have kept for archived tries.
Document the cost and caveats in the 3.4.0 release notes.
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