ashb opened a new pull request #20931: URL: https://github.com/apache/airflow/pull/20931
Set upstream dependencies when an XComArg is used in a MappedOperator, and (de)serialize them correctly. We can only re-create XComArg at the DAG level as we need to get hold of the Operator (not just a task_id) so we need a two phase approach here: when deserializing operators we create them as a place-holder class (`_XcomRef`) and then "up a level" when deserializing the DAG we turn these back in to XComArg objects. (And in so doing we needed to fix a bug or two in serializing MappedOperator that have a DAG -- it caused a recursion error.) This PR could possibly be split in to two (one to set deps, a second to serialize them. <!-- Thank you for contributing! Please make sure that your code changes are covered with tests. And in case of new features or big changes remember to adjust the documentation. Feel free to ping committers for the review! In case of existing issue, reference it using one of the following: closes: #ISSUE related: #ISSUE How to write a good git commit message: http://chris.beams.io/posts/git-commit/ --> --- **^ Add meaningful description above** Read the **[Pull Request Guidelines](https://github.com/apache/airflow/blob/main/CONTRIBUTING.rst#pull-request-guidelines)** for more information. In case of fundamental code change, Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)) is needed. In case of a new dependency, check compliance with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x). In case of backwards incompatible changes please leave a note in [UPDATING.md](https://github.com/apache/airflow/blob/main/UPDATING.md). -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
