HIVE-5147 : Newly added test TestSessionHooks is failing on trunk (Navis via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1517873 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5144 : HashTableSink allocates empty new Object[] arrays & OOMs - use a static emptyRow instead (Gopal V via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1517877 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HIVE-4779-trunk-gd