When I install a module with the following .install file:

function my_widget_field_schema($field) {
  $columns = array(
    'duration' => array('type' => 'varchar', 'length' => 8, 'not null' => FALSE),
  );
  return array(
    'columns' => $columns,
  );
}

What should the impact be on the database tables? I receive no errors, and watchdog says that the module is installed, and that it is enabled, but I see no tables added to the db that reflect the field name, widget name, etc.

--
---
drupal.org/user/367108
linkedin.com/in/jeffrgreenberg
accidentalcoder.com / ayendesigns.com
@accidentalcoder