HIVE-9116: Add unit test for multi sessions.[Spark Branch] (Chengxiang via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646504 13f79535-47bb-0310-9956-ffa450edef68
HIVE-9136: Profile query compiler [Spark Branch] (Chao via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646506 13f79535-47bb-0310-9956-ffa450edef68
HIVE-9094: TimeoutException when trying get executor count from RSC [Spark Branch] (Chengxiang via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646511 13f79535-47bb-0310-9956-ffa450edef68
HIVE-9127: Improve CombineHiveInputFormat.getSplit performance (Brock via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646512 13f79535-47bb-0310-9956-ffa450edef68
HIVE-8639: Convert SMBJoin to MapJoin [Spark Branch] (Szehon via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646523 13f79535-47bb-0310-9956-ffa450edef68
HIVE-9088: Spark counter serialization error in spark.log [Spark Branch] (Chengxiang via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646833 13f79535-47bb-0310-9956-ffa450edef68
HIVE-9154: Cache pathToPartitionInfo in context aware record reader (Chao via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646835 13f79535-47bb-0310-9956-ffa450edef68
HIVE-9164: Profile query compiler #2 [Spark Branch] (Chao via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646883 13f79535-47bb-0310-9956-ffa450edef68
HIVE-9177: Fix child operator references after NonBlockingOpDeDupProc (II) (Szehon via Xuefu)
merged from trunk, r1646994

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646995 13f79535-47bb-0310-9956-ffa450edef68
HIVE-8640: Support hints of SMBJoin [Spark Branch] (Szehon via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646998 13f79535-47bb-0310-9956-ffa450edef68
revert HIVE-9154: Cache pathToPartitionInfo in context aware record reader (Chao via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1647423 13f79535-47bb-0310-9956-ffa450edef68
HIVE-9173 : Fix auto_join29.q, auto_join_without_localtask.q determinism (Jimmy Xiang via Szehon)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1647464 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'upstream/spark' into spark