title: 42S22 SQL error: Column not found, why?
body: <p>This is my SQL:</p>
  
  <pre><code>SELECT `tbl`.*, 123 AS `test` FROM `tbl` GROUP BY `test`
  </code></pre>
  
  <p>It works when I run it directly in MySQL. But PDO says:</p>
  
  <pre><code>SQLSTATE[42S22]: Column not found: 1054 Unknown column 'test' in 'field list'
  </code></pre>
  
  <p>Why so? How to cure this problem? I'm using Zend_Db.</p>