/**
  * Creates a new ViewableConversationMessageList object.
  */
 public function __construct()
 {
     parent::__construct();
     $this->sqlSelects .= "user_option_value.*, user_table.*";
     $this->sqlJoins .= " LEFT JOIN wcf" . WCF_N . "_user user_table ON (user_table.userID = conversation_message.userID)";
     $this->sqlJoins .= " LEFT JOIN wcf" . WCF_N . "_user_option_value user_option_value ON (user_option_value.userID = user_table.userID)";
     // get avatars
     if (!empty($this->sqlSelects)) {
         $this->sqlSelects .= ',';
     }
     $this->sqlSelects .= "user_avatar.*";
     $this->sqlJoins .= " LEFT JOIN wcf" . WCF_N . "_user_avatar user_avatar ON (user_avatar.avatarID = user_table.avatarID)";
 }