Github user tedyu commented on the pull request:
https://github.com/apache/spark/pull/11066#issuecomment-180603069
From HiveContext.scala , line 552 (the last line below):
```
* 1. create a new SessionState for each HiveContext
* 2. when the Hive session is first initialized, params in HiveConf will
get picked up by the
* SQLConf. Additionally, any properties set by set() or a SET
command inside sql() will be
* set in the SQLConf *as well as* in the HiveConf.
*/
@transient
protected[hive] lazy val hiveconf: HiveConf = {
val c = executionHive.conf
```
If I read the doc correctly, the above call is supposed to create new
SessionState which is what the PR is doing.
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