Databricks Runtime 9.1 LTS specifically includes Apache Spark version 3.1.2.

While Databricks 9.1 generally supports Spark 3.1 and later versions, the LTS (Long Term Support) release 9.1 is tied to Spark 3.1.2. This ensures stability and compatibility for applications running on this specific runtime version.

It’s crucial to remember that Databricks Runtime 9.1 LTS is no longer supported, and upgrading to a newer version is recommended for the latest features, bug fixes, and security updates. Upgrading might also allow you to leverage newer Spark versions with additional functionalities and improvements.