zendframework/zf2 — pull request #3599 by ralphschindler (2013-01-29 14:56:30+00:00)
Title: [WIP] Zend\Db\Sql Literal Objects

Added Literal object to Zend\Db\Sql and Zend\Db\Sql\Predicate.
This is partly related to code in #2656 when a user wants to provide an expression with placeholders, but does not want to provide values or an array of values at Expression creation time / and yet still after statement production time.