I have a custom table defined in Drupal 7 using hook_views_api() and hook_views_data(). The table shows up in the available sources as it should, and its fields show up within the view as they should.

If I simply select the field I want, the preview shows a list of values as it should. However, if I select that same field to be used as the sort, although no error is given, there is no preview data.

Here is the base information and the field definition. The database field is varchar.

$data['product']['table']['group'] = t('Products');

$data['product']['table']['base'] = array( 'title' => t('Products'), 'field' => 'pid', 'defaults' => array( 'field' => 'pid', ), ); $data['product']['manufacturer_name'] = array( 'title' => t('Manufacturer Name'), 'field' => array( 'handler' => 'views_handler_field', ), 'sort' => array( 'handler' => 'views_handler_sort', ), 'filter' => array( 'handler' => 'views_handler_filter_string', ), 'argument' => array( 'handler' => 'views_handler_argument_string', ), );