HIVE-8196: Joining on partition columns with fetch column stats enabled results it very small CE which negatively affects query performance (Prasanth J reviewed by Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.14@1628504 13f79535-47bb-0310-9956-ffa450edef68