As mentioned in the first article of this series, dynamic task mapping was not supported before this PR. However, it's now supported.

Well... partially

This article discusses the implementation details of StartTriggerArgs, which may not interest most Airflow users. However, if you're a contributor or simply interested in how Airflow works, let's dive in.

As mentioned in Starts Airflow task execution directly from the triggerer, the syntax of this feature will change after #39585 merged.

A few weeks ago, I submitted #38674 to airflow to Airflow, which was later selected as the PR of the month. (Thanks, Kaxil, for the nomination!)