Add Custom Column Filter in Order Grid Collection in Magento 2

We’ll explore how to add a custom column’s filter to Magento 2 order grid collection, enabling more precise filtering based on fields you’ve added to your order tables.

For example, a custom_column field is created in the sales_order and sales_order_grid record tables in the database and we want to add the filter for the custom_column field when fetching the collection for the sales order grid.

Then, to achieve this functionality, please follow the below steps:

Step1. Create di.xml file inside the app/code/Vendor/Module/etc/ directory. Create preference class Vendor\Module\Model\ResourceModel\Order\Grid\Collection for Magento\Sales\Model\ResourceModel\Order\Grid\Collection class in di.xml file as following.

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\Sales\Model\ResourceModel\Order\Grid\Collection" type="Vendor\Module\Model\ResourceModel\Order\Grid\Collection"/>
</config>

Step2. Create Collection.php file inside the app/code/Vendor/Module/Model/ResourceModel/Order/Grid/Collection directory. In this file, we have overrided the _initSelect() method to add filter for our custom_column field.

<?php
namespace Vendor\Module\Model\ResourceModel\Order\Grid;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Data\Collection\Db\FetchStrategyInterface as FetchStrategy;
use Magento\Framework\Data\Collection\EntityFactoryInterface as EntityFactory;
use Magento\Framework\Event\ManagerInterface as EventManager;
use Magento\Framework\Stdlib\DateTime\TimezoneInterface;
use Magento\Framework\View\Element\UiComponent\DataProvider\SearchResult;
use Magento\Sales\Model\ResourceModel\Order;
use Psr\Log\LoggerInterface as Logger;

/**
 * Order grid collection based on tenant
 */
class Collection extends \Magento\Sales\Model\ResourceModel\Order\Grid\Collection
{
    /**
     * @var TimezoneInterface
     */
    private $timeZone;

    /**
     * Initialize dependencies.
     *
     * @param EntityFactory $entityFactory
     * @param Logger $logger
     * @param FetchStrategy $fetchStrategy
     * @param EventManager $eventManager
     * @param string $mainTable
     * @param string $resourceModel
     * @param TimezoneInterface|null $timeZone
     */
    public function __construct(
        EntityFactory $entityFactory,
        Logger $logger,
        FetchStrategy $fetchStrategy,
        EventManager $eventManager,
        $mainTable = 'sales_order_grid',
        $resourceModel = Order::class,
        TimezoneInterface $timeZone = null
    ) {
        parent::__construct(
            $entityFactory,
            $logger,
            $fetchStrategy,
            $eventManager,
            $mainTable,
            $resourceModel,
            $timeZone
        );
        $this->timeZone = $timeZone ?: ObjectManager::getInstance()
            ->get(TimezoneInterface::class);
    }

    /**
     * @inheritdoc
     */
    protected function _initSelect()
    {
        parent::_initSelect();
        
        //filter for custom_column field
        $value = 10;
        $this->addFieldToFilter("custom_column", $value);

        return $this;
    }
}

If you want to display the custom column in the sales order grid. Then refer to the following blog link:
https://webkul.com/blog/add-custom-columns-to-order-grid-in-admin-magento-2/

Hope this will be helpful.
Thanks 🙂