The changes in Zend_Db_Select in 1.9.4 release started to raise an undefined variable notice:

( ! ) Notice: Undefined variable: lastFromCorrelationName in /data/html/vilagenet.com.br/library/Zend/Db/Select.php on line 840

To reproduce:

$adapter = Zend_Db_Table::getDefaultAdapter();

$select = $adapter->select()
    ->from('sometable', 'id');

$select2 = $adapter->select()
    ->from(null, 'COUNT(*) FROM (' . $select->__toString() . ') AS count');

$result = $adapter->fetchCol($select2);

The variable {{$lastFromCorrelationName}} is declared in Zend_Db_Select on line 810, inside an {{if}} statement, but is used outside it, on line 840.

Moving the declaration to just outside the {{if}} (line 800) corrects the problem, and all unit tests still pass.

Tested in trunk and the bug is still present.