HIVE-4304 : Remove unused builtins and pdk submodules (Travis Crawford via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1470203 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4103 : Remove System.gc() call from the map-join local-task loop (Gopal V via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1470227 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4248 : Implement a memory manager for ORC (Owen Omalley via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1470249 13f79535-47bb-0310-9956-ffa450edef68