HIVE-4438 : Remove unused join configuration parameter: hive.mapjoin.size.key (Gunther Hagleitner via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1477473 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4439 : Remove unused join configuration parameter: hive.mapjoin.cache.numrows (Gunther Hagleitner via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1477474 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4350 : support AS keyword for table alias (Matthew Weaver via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1477481 13f79535-47bb-0310-9956-ffa450edef68