potiuk opened a new pull request #18072: URL: https://github.com/apache/airflow/pull/18072
For quite some time we recommended MySQL collation to be utf8mb3_general_ci in order to avoid too-large-index size. Turns out that this collation is .... case-insensitive (that's where ci stands for) this causes problems in case of renaming tags (!) where only the case differs (Test -> test) as those tags are considered equal (!). It would also cause problems if there were several DAGs with ids differing by case only. Moreoever ... there is no "cs" (case sensitive) collation for utf8 for MySQL as this is apparently a hard problem: https://stackoverflow.com/questions/4558707/case-sensitive-collation-in-mysql The solution in this PR is to change collation to utf8mb3_bin - it messes up with ORDER BY, but this is not a big problem for ID kind of values. Fixes: #17897 <!-- 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]
