Add example plugins and expand docs for asset partitions#68889
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- Add custom_partition_mapper.py and custom_partition_timetable.py example plugins showing how to ship a custom PartitionMapper and a partitioned Timetable via AirflowPlugin. - Wire all three partition plugin examples (mapper, window, timetable) into the asset-partition docs. - Document FanOutMapper + max_downstream_keys, Window direction (FORWARD/BACKWARD), wait policies (WaitForAll/MinimumCount), and the partitioned vs partitioned_at_runtime distinction.
Rewrite the partitioning section so the two approaches read as kinds of one concept — predetermined (the key is worked out before the run) and runtime (the task records it), and are mutually exclusive — with the section header naming them rather than labelling them generically. Align the custom timetable plugin docstring, and fix prose "DAG" to "Dag" in the @asset section.
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Backport successfully created: v3-3-testNote: As of Merging PRs targeted for Airflow 3.X In matter of doubt please ask in #release-management Slack channel.
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…68889) (#69017) Co-authored-by: Wei Lee <[email protected]>
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Why
Partition related docs and examples can be improved
What
Was generative AI tooling used to co-author this PR?
Generated-by: [Claude] following the guidelines
{pr_number}.significant.rst, in airflow-core/newsfragments. You can add this file in a follow-up commit after the PR is created so you know the PR number.