HIVE-5285 : Custom SerDes throw cast exception when there are complex nested structures containing NonSettableObjectInspectors.(Hari Sankar via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.12@1524613 13f79535-47bb-0310-9956-ffa450edef68