Magento – How to create Search “Textfield” filter in admin grid | Magento 2

Finally, I got the output,

In my xml that defines the grid, I replaced Magento\Backend\Block\Widget\Grid as Test\Custom\Block\Adminhtml\Custom

In my Grid.php

namespace Test\Custom\Block\Adminhtml\Custom;
use Magento\Backend\Block\Widget\Grid as WidgetGrid;
class Grid extends WidgetGrid
    {
        protected function _construct()
        {
            parent::_construct();
            $this->setSaveParametersInSession(true);        
            //for default filter
            if ($this->hasData('default_filter')){
                $this->setDefaultFilter($this->getData('default_filter'));
            }
        }
        protected function _prepareCollection()
        {
            //on clicking reset filter on Grid it will make 'complete' status as default:
            if(!$this->getParam($this->getVarNameFilter(), null)) {
                $this->getCollection()->addFieldToFilter('salesGrid.status', array('eq' => 'complete'));
                $data['status'] = 'complete';           
                $this->_setFilterValues($data);
            }
            parent::_prepareCollection();
        }
    }

You could get the data collection being used by the sales order grid, extract the field data, and create an option for each unique result:

class CcTypes implements OptionSourceInterface
{

    /**
     * @var \Magento\Sales\Model\ResourceModel\Order\Grid\Collection
     */
    protected $salesCollection;

    protected $options;

    public function __construct(
        \Magento\Framework\View\Element\UiComponent\DataProvider\CollectionFactory $collectionFactory
    ) {
        $this->salesCollection = $collectionFactory->getReport("sales_order_grid_data_source");
    }

    public function toOptionArray()
    {
        if ($this->options === null) {

            foreach ($this->salesCollection->addOrder('cc_type')->addFieldToSelect('cc_type')->distinct(true) as $order) {
                $ccType = $order->getCcType();
                $this->options[] = [
                    'value' => $ccType,
                    'label' => $ccType
                ];
            }
        }

        return $this->options;
    }
}