HIVE-8280 CBO : When filter is applied on dimension table PK/FK code path is not in effect. (Harish Butani via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.14@1631497 13f79535-47bb-0310-9956-ffa450edef68