code: public function clearKey($key)
      {
          $keys = func_num_args() > 1 ? func_get_args() : (array)$key;
  
          foreach ($keys as $key) {
              $idx = array_search($key, $this->keys);
              if ($idx !== false) {
                  unset($this->keys[$idx]);
              }
          }
  
          $this->keys = array_values($this->keys);
          return $this;
  
      }
docs: Clears a key or many keys (columns). Pass a single key, an array of keys
  or multiple (string) arguments
  
  @param array|string $key
  @return self