yuqian90 opened a new pull request #7723: [AIRFLOW-7063] Fix dag.clear() slowness caused by count URL: https://github.com/apache/airflow/pull/7723 Calling `tis.count()` makes `dag.clear()` much slower than just retrieving all the `tis` and call `len()` because of some issues with how sqlalchemy generate the sql for count() when the query has many UNION statements. See the comments on the JIRA for detailed performance timing. --- Issue link: WILL BE INSERTED BY [boring-cyborg](https://github.com/kaxil/boring-cyborg) Make sure to mark the boxes below before creating PR: [x] - [v] Description above provides context of the change - [v] Commit message/PR title starts with `[AIRFLOW-NNNN]`. AIRFLOW-NNNN = JIRA ID<sup>*</sup> - [v] Unit tests coverage for changes (not needed for documentation changes) - [v] Commits follow "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)" - [v] Relevant documentation is updated including usage instructions. - [v] I will engage committers as explained in [Contribution Workflow Example](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#contribution-workflow-example). <sup>*</sup> For document-only changes commit message can start with `[AIRFLOW-XXXX]`. --- 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/master/UPDATING.md). Read the [Pull Request Guidelines](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#pull-request-guidelines) for more information.
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