Minor Description
The owner of Hive table has been back-and-forth, principal -> username -> principal, and looks like the change is not intentional. It was full principal before 2.1.1, and SPARK-19970 fixed the owner to be username instead of principal (2.1.1+, 2.2.0+). But there's a bug with null and SPARK-22846 fixed the issue of null but rolled back the owner to be principal (2.3.0+).
Ideally we should add UT to prevent changing this unintentionally, especially there's another issue SPARK-26929 to propose it to username again.
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