HIVE-7121: Use murmur hash to distribute HiveKey (Gopal V via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1601544 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7174: Do not accept string as scale and precision when reading Avro schema (Jacec via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1601545 13f79535-47bb-0310-9956-ffa450edef68