HIVE-5757: Implement vectorized support for CASE (Eric Hanson)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1555189 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5795 : Hive should be able to skip header and footer rows when reading data file for a table (Shuaishuai Nie via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1555238 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5923 : SQL std auth - parser changes (Thejas Nair, reviewed by Brock Noland)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1555280 13f79535-47bb-0310-9956-ffa450edef68