* Backquote column names that use reserved keywords.

* Backquote table names as well.

* We use "interval" in the calendar table as the partition,
  so use date_interval for calendar partition instead.
  "Interval" is a reserved SQL word.

* Backquote `date` in explicit Hive queries.

* Change default Hive version from 0.11 to 1.0, in code and config files.