HIVE-6456: Implement Parquet schema evolution (Brock via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1571877 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4545 : HS2 should return describe table results without space padding (Vaibhav Gumashta & Thejas Nair via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1572141 13f79535-47bb-0310-9956-ffa450edef68