add to the upgrading docs (refs #4617)

kohana · Oct 21, 2012 · 5e11796 · 5e11796
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commit 5e11796
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diff --git a/guide/kohana/upgrading.md b/guide/kohana/upgrading.md
@@ -78,3 +78,7 @@ would be located in
     classes/Kohana/HTTP/Header.php
 
 This also affects dynamically named classes such as drivers and ORMs. So for example, in the database config using `'mysql'` as the type instead of `'MySQL'` would throw a class not found error.
+
+## Query Builder Identifier Escaping
+
+The query builder will no longer detect columns like `COUNT("*")`. Instead, you will need to use `DB::expr()` any time you need an unescaped column. Ex: `DB::select(DB::expr('COUNT(*)'))->from('users')->execute()`.