HIVE-7686 : CBO fails to retrieve stats if there are no predicates on partitioning columns of partitioned table (Ashutosh Chauhan via Harish Butani)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1617559 13f79535-47bb-0310-9956-ffa450edef68