HIVE-7580: Support dynamic partitioning [Spark Branch] Chinna Rao via Xuefu

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1622504 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'upstream/spark' into spark
Merge remote branch 'origin/spark' into HIVE-7956