nathadfield commented on PR #67285:
URL: https://github.com/apache/airflow/pull/67285#issuecomment-4649671460
> so `{{ partition_date }}` will be partition_date for a DagRun not for
AssetEvent. it might differ if we use a RollupMapper
Good point, @Lee-W. `{{ partition_date }}` is the consumer DagRun's date,
and a `RollupMapper` collapses n upstream partitions (each with its own date)
into one downstream partition, so no single source date describes the window.
I've made `_compute_target_partition_date` return `None` for `RollupMapper`
(explicit `is_rollup` guard plus a unit test), so rollup consumers get
`partition_date=None` rather than an arbitrary first-event value and fall back
to `partition_key`. Documented alongside the other mappers that leave it `None`.
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