custom view filters

In hook_views_default_views(), I have:

$handler->override_option('filters', array(.........)...

I want to add an additional check against a custom table - how would I do that?
For example, filter on mytable.mycol = 'home', I used the following (which did not work):

  'mytype' => array(
    'operator' => '=',
    'value' => 'home',
    'group' => '1',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'mytype,
    'table' => 'mytable',
    'field' => 'mycol',
    'relationship' => 'none',
  ),

[Edited to add <code> and </code> tags; nevets]