HIVE-7574 : CommonJoinOperator.checkAndGenObject calls LOG.Trace per row from probe side in a HashMap join consuming 4% of the CPU (Mostafa Mokhtar, reviewed by Sergey Shelukhin)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1616357 13f79535-47bb-0310-9956-ffa450edef68