HIVE-5829: Rewrite Trim and Pad UDFs based on GenericUDF (Mohammad Islam via cws)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1556125 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5946 - DDL authorization task factory should be better tested (Brock reviewed by Thejas)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1556253 13f79535-47bb-0310-9956-ffa450edef68
HIVE-2599 - Support Composit/Compound Keys with HBaseStorageHandler (Swarnim Kulkarni via Brock Noland)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1556266 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6105: LongWritable.compareTo needs shimming (Navis vis Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1556309 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6051: Create DecimalColumnVector and a representative VectorExpression for decimal (Eric Hanson)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1556595 13f79535-47bb-0310-9956-ffa450edef68
Merge latest trunk into branch. (Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/tez@1556642 13f79535-47bb-0310-9956-ffa450edef68