HIVE-6945 : issues with dropping partitions on Oracle (Sergey Shelukhin, reviewed by Ashutosh Chauhan)
(from https://issues.apache.org/jira/secure/attachment/12643950/HIVE-6945-0.13.1.patch)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1593457 13f79535-47bb-0310-9956-ffa450edef68