$this->addJoinConds( [ 'user_groups' => [ 'INNER JOIN', 'ug_user=user_id' ] ] );
$this->addFields( [ 'user_name' ] );
$this->addFields( UserGroupMembership::selectFields() );
$this->addJoinConds( [ 'user_groups' => [ 'INNER JOIN', 'ug_user=user_id' ] ] );
$this->addFields( [ 'user_name' ] );
$this->addFields( UserGroupMembership::selectFields() );