facebook/presto — pull request #1834 by nezihyigitbasi (2014-10-20 17:35:21+00:00)
Title: Add map_keys and map_values functions

This PR adds two functions that already exists in Hive: the ``map_keys`` and ``map_values`` functions.

``map_keys(map)`` returns the list of keys of the given map as an ``array``

``map_values(map)`` returns the list of values of the given map as an ``array``