HIVE-8111 : CBO trunk merge: duplicated casts for arithmetic expressions in Hive and CBO (Sergey Shelukhin via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.14@1628234 13f79535-47bb-0310-9956-ffa450edef68