HIVE-4796 : Increase coverage of package org.apache.hadoop.hive.common.metrics (Ivan Veselovsky)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1501052 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4580 : Change DDLTask to report errors using canonical error messages rather than http status codes (Eugene Koifman via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1501053 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4813 : Improve test coverage of package org.apache.hadoop.hive.ql.optimizer.pcr (Ivan Veselovsky via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1501099 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4819 : Comments in CommonJoinOperator for aliasTag is not valid (Navis via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1501129 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'upstream/trunk' into trunk