zendframework/zf2 — pull request #2132 by ralphschindler (2012-08-08 15:24:03+00:00)
Title: Zend\Db: Subselect support in Zend\Db\Sql*

Subselect support is important to make Pagination work in 2.0.0. It currently applies to Select::from and the In predicate; though foundational support is not built in for it to be expanded to other areas easily.

The public API for this feature is 100% backwards compatible.
The protected API has changed for Zend\Db\Sql\AbstractSql only, which at this point should affect no one.