EllisLab/CodeIgniter — pull request #2534 by pfote (2013-07-17 14:51:38+00:00)
Title: overwite is_write_type() from DB_driver in the postgres subdrivers

allow posgreSQLs "INSERT INTO ... RETURNING ..." syntax be used in ->query() and return something
fixes https://github.com/EllisLab/CodeIgniter/issues/2490