Is possible to get other table alias.

I have created the Views filter handler which work with the cck field. I want to get table alias from cck field that is already in Views fields. I try following code:

$data['my_module']['table']['join'] = array(
  'node' => array(
    'left_field' => 'vid',
    'field' => 'vid',
    'table' => 'content_type_test',
  ),  
);  
$data['my_module']['table']['group'] = t('My Module');
$data['my_module']['new_filter'] = array(
  'filter' => array(
    'title' => t('New Filter'),
    'table' => 'content_type_test',
    'handler' => 'views_handler_filter_new_filter',
  ),  
);

When I add my new filter and see on the preview query, They join table 2 times that form Views field 1 time and Views filter (from my filter) 1 time. That make multi-rows query, so consume many memory. Anybody have an idea how to fix it.

Sorry about my English. I hope you get it!
Thanks in advance.