Add valid columns to fact tables; and LightestFactResolver

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/HIVE-4115@1481742 13f79535-47bb-0310-9956-ffa450edef68
Fix aggregate expressions in alias replacer

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/HIVE-4115@1481773 13f79535-47bb-0310-9956-ffa450edef68