uranusjr commented on code in PR #64571:
URL: https://github.com/apache/airflow/pull/64571#discussion_r3339800706
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airflow-core/docs/authoring-and-scheduling/assets.rst:
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@@ -638,6 +638,87 @@ including ``partition_key`` in the request body):
"partition_key": "us|2026-03-10T09:00:00"
}'
+Rollup mappers
+~~~~~~~~~~~~~~
+
+.. versionadded:: 3.3.0
+
+The mappers shown above match upstream keys to a single downstream key
one-for-one.
+For a coarser downstream period made up of many upstream events — an hourly
upstream
+that drives a daily summary, daily inputs that compose a weekly report — use
+``RollupMapper``. ``RollupMapper`` composes an upstream mapper (which
normalizes each
Review Comment:
Can be a separate PR—this and other class names should link to API
documentation (``:class:`~airflow...`` references)
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