fat-catTW opened a new pull request, #72871:
URL: https://github.com/apache/airflow/pull/72871
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## Summary
This adds a batch XCom read path for mapped task input resolution.
When `DictOfListsExpandInput.resolve()` sees multiple direct return-key
`PlainXComArg` inputs that can be safely batched, it now fetches them through
one grouped Execution API request instead of resolving each `XComArg` one by
one.
The old resolution path is preserved as a fallback for cases that are not
batched, including mapped upstreams, range map indexes, non-return keys,
transformed/combined XComArgs, and custom XCom backends.
## Changes
- Add `POST /execution/xcoms/batch` for fetching multiple XCom values for
the same Dag run, key, and map index.
- Add Task SDK client, supervisor comms, request handler, and
`BaseXCom.get_many()` support for batch XCom fetches.
- Use the batch path in `expandinput.py` for eligible direct `PlainXComArg`
inputs.
- Add Cadwyn version gating for the new Execution API endpoint and
supervisor schema changes.
- Regenerate Task SDK generated API models and supervisor schema snapshot.
- Add tests for the API endpoint, version gating, client method, supervisor
message handling, and mapped operator batching behavior.
## Tests
- `uv run ruff format ...`
- `uv run ruff check --fix ...`
- `git diff --check`
- `prek run mypy-airflow-core --all-files`
- `uv run --project scripts python
scripts/ci/prek/check_execution_api_versions.py`
- `uv run --project scripts python
scripts/ci/prek/generate_supervisor_schemas_snapshot.py`
- `uv run --project scripts python
scripts/ci/prek/check_supervisor_schemas_versions.py`
- `uv run --project task-sdk pytest
task-sdk/tests/task_sdk/api/test_client.py::TestXCOMOperations
task-sdk/tests/task_sdk/execution_time/test_supervisor.py::TestHandleRequest
task-sdk/tests/task_sdk/definitions/test_mappedoperator.py::test_map_cross_product
task-sdk/tests/task_sdk/definitions/test_mappedoperator.py::test_map_product_same
-xvs`
- `uv run --project airflow-core pytest
airflow-core/tests/unit/api_fastapi/execution_api/versions/v2025_04_28/test_xcom.py
airflow-core/tests/unit/api_fastapi/execution_api/versions/v2026_10_30/test_xcoms.py
-xvs`
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