title: Zend Column not found: 1054 Unknown column '0' in 'field list'
body: <p>I have a next code:</p>
  
  <pre><code>    $parent_priority = $data['priority'];
      $where = $this-&gt;getAdapter()-&gt;quoteInto('priority &gt;= ?', $parent_priority);
      $columns = array ('id',
                        'title',
                        'enabled',
                        'description',
                        'pv',
                        'gv',
                        'mps', 'priority',
                        );
      $select_data = $this-&gt;select()-&gt;from($this-&gt;_name, $columns);
      $ranks = $this-&gt;fetchAll($select_data)-&gt;toArray();
  </code></pre>
  
  <p>But Zend create an error "Column not found: 1054 Unknown column '0' in 'field list'" in line <code>$ranks = $this-&gt;fetchAll($select_data)-&gt;toArray();</code></p>
  
  <p>How I can solve this?</p>