HIVE-5976 - Decouple input formats from STORED as keywords (David Chen via Brock)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1610452 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7398 : Parent GBY of MUX is removed even it's not for semijoin (Navis via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1610457 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7213 : COUNT(*) returns out-dated count value after TRUNCATE (Ashutosh Chauhan via Navis)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1610458 13f79535-47bb-0310-9956-ffa450edef68