rails/rails — pull request #12523 by lsylvester (2013-10-14 10:59:23+00:00)
Title: Support for PostgreSQL citext data type.

citext makes it possible to use AR Hash finders for case-insensitive
matching as sql UPPER/LOWER functions are not needed.

This is an updated version of #9182 and #10231.

The schema.rb dumps now include citext columns and unknown OID warning that appeared in the test has been fixed by reconnecting to the database after the extension was enabled.