Since version 1.5 and issue
SPARK-9415, MapTypes can no longer be used in GROUP BY and join clauses. This makes it incompatible to HiveQL. So, a Hive feature was removed from Spark. This makes Spark incompatible to various HiveQL statements.
|Add sorting functionality in MapType||In Progress||Unassigned|
|Add a new expression "SortMaps" to sort the entries inside a "MapData"||Open||Unassigned|