Lee-W commented on code in PR #64571:
URL: https://github.com/apache/airflow/pull/64571#discussion_r3322157486


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airflow-core/newsfragments/64571.significant.rst:
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@@ -29,8 +29,33 @@ an hourly partition).
 
 Mappers can be set globally on a ``PartitionedAssetTimetable`` or overridden 
per upstream asset via ``partition_mapper_config``.
 
+**Rollup (one downstream run per window of upstream partitions)**:
+
+- ``RollupMapper`` — wraps a ``upstream_mapper`` (which normalises the 
upstream key to the

Review Comment:
   Added a "Rollup mappers" subsection to 
`airflow-core/docs/authoring-and-scheduling/assets.rst` right after the 
existing partition narrative.



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