dbplyr 2.2.1

• Querying Oracle databases works again. Unfortunately, the fix requires every
  column to be explicitly selected again (@mgirlich, #908).

• semi_join() and anti_join() work again for Spark (@mgirlich, #915).

• str_c() is now translated to || in Oracle (@mgirlich, #921).

• sd(), var(), cor() and cov() now give clear error messages on
  databases that don't support them.

• any() and all() gain default translations for all backends.