zendframework/zf2 — pull request #2687 by ralphschindler (2012-10-05 16:45:51+00:00)
Title: Hotfix/db sql nested expressions

Fix for #2521.

* This now allows expressions within expressions:

```php
$expression = new Predicate\Operator('release_date', '=', new Expression('FROM_UNIXTIME(?)', 100000000));
```

* Previous internal demarcation of the type being TYPE_SELECT is deprecated in favor of TYPE_VALUE. (This is an undocumented and internal only API change).
* Expression objects now accept scalar|array instead of string|array