Comments - MariaDB 10.3.11 Release Notes
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No, not yet. If you look at the very top of the page you'll see the red banner saying
Note: This page describes features in the source repository for MariaDB 10.3. There are currently no official packages or binaries available for download which contain the features. If you want to try out any of the new features described here you will need to get and compile the code yourself.
It'll disappear when 10.3.11 will be released, and that's when you'll see packages in the repository.
Got it.
Thanks Sergei