ashb opened a new pull request, #46319: URL: https://github.com/apache/airflow/pull/46319
This is needed so that we can have the scheduler create the expand TIs for the downstream tasks. Note, that we don't enforce that this is set when it needs to be on the server side, as the only way for us to know if we need to or not (and conversely, when it's set when it _doesn't_ need to, which is no effect other than creating a small DB row that nothing will ever read) as doing that would involve loading the serialized DAG to walk the structure which is a relatively expensive operation. We could improve that by "pre-computing" some of the info on what tasks are actually mapped or not before serialization so we wouldn't have to walk the task groups to find out, but that wouldn't do anything about the need to load the serialized DAG which is the expensive part. If this turns out to be a problem to not be enforcing this is passed when required we can revisit the decision later. Relates to #44360 -- 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: commits-unsubscr...@airflow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
