Merged HIVE-7769 - add --SORT_BEFORE_DIFF to union all .q tests (Na Yang via Brock)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1618942 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7781 - Enable windowing and analytic function qtests [Spark Branch] (Chengxiang Li via Brock)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1618950 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7728 - Enable q-tests for TABLESAMPLE feature [Spark Branch] (Chengxiang Li via Brock)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1618953 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7773 - Union all query finished with errors [Spark Branch] (Rui Li via Brock)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1618986 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7717 - Add .q tests coverage for 'union all' [Spark Branch] (Na Yang via Brock)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1619017 13f79535-47bb-0310-9956-ffa450edef68