rsim/oracle-enhanced — pull request #518 by yahonda (2014-11-05 13:03:18+00:00)
Title: Use Arel::Visitors::Oracle12 when Oracle server version is 12c

This pull request supports [Oracle 12c better Top-N query] (http://oracle-base.com/articles/12c/row-limiting-clause-for-top-n-queries-12cr1.php) to Oracle enhanced adapter.

To make this pull request work Arel needs support `Arel::Visitors::Oracle12`. I'll open another pull request to rails/arel.