protected function fixTable(
        $table,
        /*# string */ $tableAlias = ''
    )/*# : array */ {
        if (empty($table)) {
            $table = [];
        } else {
            if (!is_array($table)) {
                $table = empty($tableAlias) ? [$table] :
                [$table => $tableAlias];
            }
        }
        return $table;
    }