Zim95 commented on issue #70762:
URL: https://github.com/apache/airflow/issues/70762#issuecomment-6557407556

   Hi @Patrick539, I've opened #76220 for this, using the shared parser 
approach from my last comment.
   
   Your chain should now work with the default settings: a key can go through 
`StartOfHourMapper`, then `StartOfDayMapper`, then `StartOfYearMapper` in 
separate Dags. `StartOfYearMapper` also accepts the default output of the week, 
month and quarter mappers, as you described.
   
   There are two limits to be aware of:
   
   * If a mapper uses a custom `output_format`, the next mapper still needs a 
matching `input_format`.
   * Mappers used inside a `RollupMapper` still accept only their 
`input_format`, because those are the exact keys the rollup waits for. 
Accepting other formats could hold the Dag run forever.
   
   If you have time, it would be great to know whether this covers your use 
case. The open questions are listed in the PR, and any feedback on them is 
welcome.


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