code: protected function reset()
      {
          $this->_sql = null;
          $this->_pendingParams = [];
          $this->params = [];
          $this->_refreshTableName = null;
          $this->_isolationLevel = false;
          $this->_retryHandler = null;
      }
docs: Resets command properties to their initial state.
  
  @since 2.0.13