Combine.php

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<?php
namespace Magento\CatalogRule\Model\Rule\Condition;

class Combine extends \Magento\Rule\Model\Condition\Combine
{
    protected $_productFactory;

    public function __construct(
        \Magento\Rule\Model\Condition\Context $context,
        \Magento\CatalogRule\Model\Rule\Condition\ProductFactory $conditionFactory,
        array $data = []
    ) {
        $this->_productFactory = $conditionFactory;
        parent::__construct($context, $data);
        $this->setType(\Magento\CatalogRule\Model\Rule\Condition\Combine::class);
    }

    public function getNewChildSelectOptions()
    {
        $productAttributes = $this->_productFactory->create()->loadAttributeOptions()->getAttributeOption();
        $attributes = [];
        foreach ($productAttributes as $code => $label) {
            $attributes[] = [
                'value' => 'Magento\CatalogRule\Model\Rule\Condition\Product|' . $code,
                'label' => $label,
            ];
        }
        $conditions = parent::getNewChildSelectOptions();
        $conditions = array_merge_recursive(
            $conditions,
            [
                [
                    'value' => \Magento\CatalogRule\Model\Rule\Condition\Combine::class,
                    'label' => __('Conditions Combination'),
                ],
                ['label' => __('Product Attribute'), 'value' => $attributes]
            ]
        );
        return $conditions;
    }

    public function collectValidatedAttributes($productCollection)
    {
        foreach ($this->getConditions() as $condition) {
            $condition->collectValidatedAttributes($productCollection);
        }
        return $this;
    }
}