Spark 2.2.1 is a maintenance release containing stability fixes. This release is based on the branch-2.2 maintenance branch of Spark. We strongly recommend all 2.2.x users to upgrade to this stable release.
You can consult JIRA for the detailed changes.
<a: Int>, and we read it into Scala Int. If column a has null values, when transformation is applied some unexpected value can be returned.
We would like to acknowledge all community members for contributing patches to this release.