Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/15738
The purpose of this is to ensure the same behavior as Hive so users can
move to SparkSQL without rewriting queries. That's why I'm trying to keep
behavior as close as possible to the behavior of Hive (and Spark 1.6.1).
Session vars are kept in a different namespace, so collisions should not
overwrite configs and session vars take precedence in Hive. Because we still
use a Hive SessionState and pass some commands to Hive, I thought it was also
important to store the hive variables in the session state like Hive would.
That way any command that are passed to Hive that have variable references work
as well.
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