InStockOptionSelectBuilder.php

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<?php
namespace Magento\ConfigurableProduct\Plugin\Model\ResourceModel\Attribute;

use Magento\CatalogInventory\Model\ResourceModel\Stock\Status;
use Magento\ConfigurableProduct\Model\ResourceModel\Attribute\OptionSelectBuilderInterface;
use Magento\Framework\DB\Select;

class InStockOptionSelectBuilder
{
    private $stockStatusResource;
    
    public function __construct(Status $stockStatusResource)
    {
        $this->stockStatusResource = $stockStatusResource;
    }

    public function afterGetSelect(OptionSelectBuilderInterface $subject, Select $select)
    {
        $select->joinInner(
            ['stock' => $this->stockStatusResource->getMainTable()],
            'stock.product_id = entity.entity_id',
            []
        )->where(
            'stock.stock_status = ?',
            \Magento\CatalogInventory\Model\Stock\Status::STATUS_IN_STOCK
        );
        
        return $select;
    }
}