Flag_content table joined 2 times.

Ooops...issue bugged.

Im developing Flag Friend 2.x branch and playing with Views. Currently the only way to use "Flag" field is to add it's relationship first. There's no problem with that, however I see that "flag_content" table is joined 2 times. Is there reason it works this way ? Maybe optimize it ? I understand this is not a problem or bug cause that's not going to break anything.
Example query:

SELECT DISTINCT(users.uid) AS uid,
   users.picture AS users_picture,
   users.name AS users_name,
   flag_content.content_id AS flag_content_content_id
 FROM users users 
 INNER JOIN flag_content flag_content_users ON users.uid = flag_content_users.uid AND flag_content_users.fid = 5
 LEFT JOIN flag_friend flag_friend ON users.uid = flag_friend.friend_uid
 LEFT JOIN flag_content flag_content ON users.uid = flag_content.content_id AND (flag_content.fid = 5 AND flag_content.uid = ***CURRENT_USER*** AND flag_content.sid = 0)
 WHERE (users.status <> 0) AND (flag_friend.uid = 3)
 GROUP BY uid

My exported view:

$view = new view;
$view->name = 'friends';
$view->description = 'Various page displays for flag_friend.';
$view->tag = 'flag.friend';
$view->view_php = '';
$view->base_table = 'users';
$view->is_cacheable = FALSE;
$view->api_version = 2;
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */
$handler = $view->new_display('default', 'Defaults', 'default');
$handler->override_option('relationships', array(
  'flag_user_content_rel' => array(
    'label' => 'user flagged content',
    'required' => 1,
    'flag' => 'contact_list',
    'id' => 'flag_user_content_rel',
    'table' => 'users',
    'field' => 'flag_user_content_rel',
    'relationship' => 'none',
  ),
));
$handler->override_option('fields', array(
  'name' => array(
    'label' => 'Name',
    'link_to_user' => 1,
    'exclude' => 0,
    'id' => 'name',
    'table' => 'users',
    'field' => 'name',
    'override' => array(
      'button' => 'Override',
    ),
    'relationship' => 'none',
  ),
  'ops' => array(
    'label' => 'Flag link',
    'alter' => array(
      'alter_text' => 0,
      'text' => '',
      'make_link' => 0,
      'path' => '',
      'link_class' => '',
      'alt' => '',
      'prefix' => '',
      'suffix' => '',
      'target' => '',
      'help' => '',
      'trim' => 0,
      'max_length' => '',
      'word_boundary' => 1,
      'ellipsis' => 1,
      'strip_tags' => 0,
      'html' => 0,
    ),
    'empty' => '',
    'hide_empty' => 0,
    'empty_zero' => 0,
    'link_type' => '',
    'exclude' => 0,
    'id' => 'ops',
    'table' => 'flag_content',
    'field' => 'ops',
    'relationship' => 'flag_user_content_rel',
    'override' => array(
      'button' => 'Override',
    ),
  ),
));
$handler->override_option('filters', array(
  'status' => array(
    'operator' => '=',
    'value' => '1',
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'status',
    'table' => 'users',
    'field' => 'status',
    'relationship' => 'none',
  ),
));
$handler->override_option('access', array(
  'type' => 'perm',
  'perm' => 'access content',
));
$handler->override_option('cache', array(
  'type' => 'none',
));
$handler->override_option('empty', 'No Friends have been added.');
$handler->override_option('empty_format', '1');
$handler->override_option('use_pager', '1');
$handler->override_option('distinct', 1);
$handler->override_option('style_plugin', 'table');
$handler->override_option('style_options', array(
  'grouping' => '',
  'override' => 1,
  'sticky' => 0,
  'order' => 'asc',
  'columns' => array(
    'picture' => 'picture',
    'name' => 'picture',
    'message' => 'message',
    'ops' => 'ops',
    'uid' => 'ops',
  ),
  'info' => array(
    'picture' => array(
      'sortable' => 0,
      'separator' => '',
    ),
    'name' => array(
      'sortable' => 0,
      'separator' => '',
    ),
    'message' => array(
      'separator' => '',
    ),
    'ops' => array(
      'separator' => '',
    ),
    'uid' => array(
      'separator' => '',
    ),
  ),
  'default' => '-1',
));
$handler = $view->new_display('page', 'Page (friends)', 'page_1');
$handler->override_option('relationships', array(
  'flag_user_content_rel' => array(
    'label' => 'user flagged content',
    'required' => 1,
    'flag' => 'contact_list',
    'id' => 'flag_user_content_rel',
    'table' => 'users',
    'field' => 'flag_user_content_rel',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
));
$handler->override_option('fields', array(
  'picture' => array(
    'label' => 'Friend',
    'exclude' => 0,
    'id' => 'picture',
    'table' => 'users',
    'field' => 'picture',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
  'name' => array(
    'label' => 'Name',
    'link_to_user' => 1,
    'exclude' => 0,
    'id' => 'name',
    'table' => 'users',
    'field' => 'name',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
  'ops' => array(
    'label' => 'Actions',
    'alter' => array(
      'alter_text' => 0,
      'text' => '',
      'make_link' => 0,
      'path' => '',
      'link_class' => '',
      'alt' => '',
      'prefix' => '',
      'suffix' => '',
      'target' => '',
      'help' => '',
      'trim' => 0,
      'max_length' => '',
      'word_boundary' => 1,
      'ellipsis' => 1,
      'strip_tags' => 0,
      'html' => 0,
    ),
    'empty' => '',
    'hide_empty' => 0,
    'empty_zero' => 0,
    'link_type' => '',
    'exclude' => 0,
    'id' => 'ops',
    'table' => 'flag_content',
    'field' => 'ops',
    'relationship' => 'flag_user_content_rel',
    'override' => array(
      'button' => 'Use default',
    ),
  ),
));
$handler->override_option('arguments', array(
  'uid' => array(
    'default_action' => 'not found',
    'style_plugin' => 'default_summary',
    'style_options' => array(),
    'wildcard' => '',
    'wildcard_substitution' => '',
    'title' => '',
    'breadcrumb' => '',
    'default_argument_type' => 'fixed',
    'default_argument' => '',
    'validate_type' => 'user',
    'validate_fail' => 'not found',
    'break_phrase' => 0,
    'not' => 0,
    'id' => 'uid',
    'table' => 'flag_friend',
    'field' => 'uid',
    'validate_user_argument_type' => 'uid',
    'validate_user_roles' => array(
      '2' => 0,
      '3' => 0,
      '4' => 0,
    ),
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_type' => array(
      'forum' => 0,
      'blogpost' => 0,
      'comment' => 0,
      'discussion' => 0,
      'discussion_reply' => 0,
      'help' => 0,
      'page' => 0,
      'profile' => 0,
      'site_group' => 0,
      'specialist' => 0,
    ),
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_vocabulary' => array(
      '1' => 0,
      '7' => 0,
      '6' => 0,
      '8' => 0,
      '9' => 0,
      '10' => 0,
      '11' => 0,
      '14' => 0,
      '12' => 0,
      '13' => 0,
      '17' => 0,
      '16' => 0,
      '15' => 0,
    ),
    'validate_argument_type' => 'tid',
    'validate_argument_transform' => 0,
    'validate_user_restrict_roles' => 0,
    'validate_argument_node_flag_name' => '*relationship*',
    'validate_argument_node_flag_test' => 'flaggable',
    'validate_argument_node_flag_id_type' => 'id',
    'validate_argument_user_flag_name' => '*relationship*',
    'validate_argument_user_flag_test' => 'flaggable',
    'validate_argument_user_flag_id_type' => 'id',
    'validate_argument_is_member' => 0,
    'validate_argument_php' => '',
  ),
));

Continue:

$handler->override_option('title', 'Friends');
$handler->override_option('path', 'user/%/friends/all');
$handler->override_option('menu', array(
  'type' => 'default tab',
  'title' => 'View All Friends',
  'description' => '',
  'weight' => '-10',
  'name' => 'navigation',
));
$handler->override_option('tab_options', array(
  'type' => 'tab',
  'title' => 'Friends',
  'description' => '',
  'weight' => '0',
));
$handler = $view->new_display('page', 'Page (pending)', 'page_2');
$handler->override_option('fields', array(
  'picture' => array(
    'label' => 'User',
    'exclude' => 0,
    'id' => 'picture',
    'table' => 'users',
    'field' => 'picture',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
  'name' => array(
    'label' => 'Name',
    'link_to_user' => 1,
    'exclude' => 0,
    'id' => 'name',
    'table' => 'users',
    'field' => 'name',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
  'message' => array(
    'label' => 'Message',
    'exclude' => 0,
    'id' => 'message',
    'table' => 'flag_friend_message',
    'field' => 'message',
    'relationship' => 'flag_friend_content_rel',
    'override' => array(
      'button' => 'Use default',
    ),
  ),
  'ops' => array(
    'label' => 'Actions',
    'link_type' => '',
    'exclude' => 0,
    'id' => 'ops',
    'table' => 'flag_content',
    'field' => 'ops',
    'relationship' => 'flag_friend_content_rel',
    'override' => array(
      'button' => 'Use default',
    ),
  ),
  'uid' => array(
    'label' => 'Flag friend links',
    'exclude' => 0,
    'id' => 'uid',
    'table' => 'flag_friend',
    'field' => 'uid',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
));
$handler->override_option('arguments', array(
  'content_id' => array(
    'default_action' => 'default',
    'style_plugin' => 'default_summary',
    'style_options' => array(),
    'wildcard' => 'all',
    'wildcard_substitution' => 'All',
    'title' => '',
    'default_argument_type' => 'user',
    'default_argument' => '',
    'validate_type' => 'php',
    'validate_fail' => 'not found',
    'break_phrase' => 0,
    'not' => 0,
    'id' => 'content_id',
    'table' => 'flag_content',
    'field' => 'content_id',
    'relationship' => 'flag_friend_content_rel',
    'override' => array(
      'button' => 'Use default',
    ),
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_vocabulary' => array(),
    'validate_argument_type' => 'tid',
    'validate_argument_node_flag_name' => '*relationship*',
    'validate_argument_node_flag_test' => 'flaggable',
    'validate_argument_node_flag_id_type' => 'id',
    'validate_argument_user_flag_name' => '*relationship*',
    'validate_argument_user_flag_test' => 'flaggable',
    'validate_argument_user_flag_id_type' => 'id',
    'validate_argument_php' => 'if ($argument !== $GLOBALS[\'user\']->uid && !user_access(\'administer users\')) {
                                    return FALSE;
                                  }
                                  return TRUE;',
  ),
));
$handler->override_option('title', 'Friend Requests');
$handler->override_option('header', 'These are users who would like to be your friend.');
$handler->override_option('header_format', '1');
$handler->override_option('header_empty', 0);
$handler->override_option('empty', 'No Friend Requests.');
$handler->override_option('path', 'user/%/friends/pending');
$handler->override_option('menu', array(
  'type' => 'tab',
  'title' => 'Friend Requests',
  'description' => '',
  'weight' => '0',
  'name' => 'navigation',
));
$handler->override_option('tab_options', array(
  'type' => 'none',
  'title' => '',
  'description' => '',
  'weight' => 0,
));
$handler = $view->new_display('page', 'Page (flagged)', 'page_3');
$handler->override_option('relationships', array(
  'flag_content_rel' => array(
    'label' => 'flag',
    'required' => 1,
    'flag' => 'friend',
    'user_scope' => 'any',
    'id' => 'flag_content_rel',
    'table' => 'users',
    'field' => 'flag_content_rel',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
  'uid' => array(
    'label' => 'Flag user',
    'required' => 0,
    'id' => 'uid',
    'table' => 'flag_content',
    'field' => 'uid',
    'relationship' => 'flag_content_rel',
    'override' => array(
      'button' => 'Use default',
    ),
  ),
));
$handler->override_option('fields', array(
  'picture' => array(
    'label' => 'User',
    'exclude' => 0,
    'id' => 'picture',
    'table' => 'users',
    'field' => 'picture',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
  'name' => array(
    'label' => 'Name',
    'link_to_user' => 1,
    'exclude' => 0,
    'id' => 'name',
    'table' => 'users',
    'field' => 'name',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
  'message' => array(
    'label' => 'Message',
    'exclude' => 0,
    'id' => 'message',
    'table' => 'flag_friend_message',
    'field' => 'message',
    'relationship' => 'flag_content_rel',
    'override' => array(
      'button' => 'Use default',
    ),
  ),
  'ops' => array(
    'label' => 'Actions',
    'link_type' => '',
    'exclude' => 0,
    'id' => 'ops',
    'table' => 'flag_content',
    'field' => 'ops',
    'relationship' => 'flag_content_rel',
    'override' => array(
      'button' => 'Use default',
    ),
  ),
));
$handler->override_option('arguments', array(
  'uid' => array(
    'default_action' => 'default',
    'style_plugin' => 'default_summary',
    'style_options' => array(),
    'wildcard' => 'all',
    'wildcard_substitution' => 'All',
    'title' => '',
    'breadcrumb' => '',
    'default_argument_type' => 'user',
    'default_argument' => '',
    'validate_type' => 'none',
    'validate_fail' => 'not found',
    'break_phrase' => 0,
    'not' => 0,
    'id' => 'uid',
    'table' => 'users',
    'field' => 'uid',
    'validate_user_argument_type' => 'uid',
    'validate_user_roles' => array(
      '2' => 0,
    ),
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'uid',
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_type' => array(
      'page' => 0,
      'smackdown' => 0,
      'story' => 0,
    ),
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_vocabulary' => array(),
    'validate_argument_type' => 'tid',
    'validate_argument_transform' => 0,
    'validate_user_restrict_roles' => 0,
    'validate_argument_node_flag_name' => '*relationship*',
    'validate_argument_node_flag_test' => 'flaggable',
    'validate_argument_node_flag_id_type' => 'id',
    'validate_argument_user_flag_name' => '*relationship*',
    'validate_argument_user_flag_test' => 'flaggable',
    'validate_argument_user_flag_id_type' => 'id',
    'validate_argument_php' => '',
  ),
));
$handler->override_option('title', 'Awaiting Friend Approvals');
$handler->override_option('header', 'These are users who you have requested to be friends with.');
$handler->override_option('header_format', '1');
$handler->override_option('header_empty', 1);
$handler->override_option('empty', 'No Friend Requests.');
$handler->override_option('path', 'user/%/friends/flagged');
$handler->override_option('menu', array(
  'type' => 'tab',
  'title' => 'Awaiting Friend Approvals',
  'description' => '',
  'weight' => '0',
  'name' => 'navigation',
));
$handler->override_option('tab_options', array(
  'type' => 'none',
  'title' => '',
  'description' => '',
  'weight' => 0,
));
$handler = $view->new_display('block', 'Current user\'s Friends block', 'block_1');
$handler->override_option('relationships', array());
$handler->override_option('fields', array(
  'name' => array(
    'label' => 'Name',
    'link_to_user' => 1,
    'exclude' => 0,
    'id' => 'name',
    'table' => 'users',
    'field' => 'name',
    'override' => array(
      'button' => 'Override',
    ),
    'relationship' => 'none',
  ),
  'uid' => array(
    'label' => 'Flag friend links',
    'exclude' => 0,
    'id' => 'uid',
    'table' => 'flag_friend',
    'field' => 'uid',
    'relationship' => 'none',
  ),
));
$handler->override_option('arguments', array(
  'friend_uid' => array(
    'default_action' => 'default',
    'style_plugin' => 'default_summary',
    'style_options' => array(),
    'wildcard' => 'all',
    'wildcard_substitution' => 'All',
    'title' => '',
    'default_argument_type' => 'current_user',
    'default_argument' => '',
    'validate_type' => 'none',
    'validate_fail' => 'not found',
    'break_phrase' => 0,
    'not' => 0,
    'id' => 'friend_uid',
    'table' => 'flag_friend',
    'field' => 'friend_uid',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_node_flag_name' => '*relationship*',
    'validate_argument_node_flag_test' => 'flaggable',
    'validate_argument_node_flag_id_type' => 'id',
    'validate_argument_user_flag_name' => '*relationship*',
    'validate_argument_user_flag_test' => 'flaggable',
    'validate_argument_user_flag_id_type' => 'id',
    'validate_argument_php' => '',
  ),
));
$handler->override_option('items_per_page', 6);
$handler->override_option('use_pager', '0');
$handler->override_option('use_more', 1);
$handler->override_option('block_description', '');
$handler->override_option('block_caching', -1);