Merge HIVE-7807 - Refer to umask property using FsPermission.UMASK_LABEL (Venki Korukanti via Brock)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1619493 13f79535-47bb-0310-9956-ffa450edef68
Merged HIVE-7820 - union_null.q is not deterministic (Brock Noland reviewed by Szehon)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1619598 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7815 - Reduce Side Join with single reducer [Spark Branch] (Szehon via Brock)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1619639 13f79535-47bb-0310-9956-ffa450edef68