DataProvider.php

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<?php
namespace Magento\Customer\Ui\Component;

use Magento\Customer\Api\Data\AttributeMetadataInterface;
use Magento\Customer\Ui\Component\Listing\AttributeRepository;
use Magento\Framework\Api\FilterBuilder;
use Magento\Framework\Api\Search\SearchCriteriaBuilder;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\View\Element\UiComponent\DataProvider\Reporting;

class DataProvider extends \Magento\Framework\View\Element\UiComponent\DataProvider\DataProvider
{
    private $attributeRepository;

    public function __construct(
        $name,
        $primaryFieldName,
        $requestFieldName,
        Reporting $reporting,
        SearchCriteriaBuilder $searchCriteriaBuilder,
        RequestInterface $request,
        FilterBuilder $filterBuilder,
        AttributeRepository $attributeRepository,
        array $meta = [],
        array $data = []
    ) {
        $this->attributeRepository = $attributeRepository;
        parent::__construct(
            $name,
            $primaryFieldName,
            $requestFieldName,
            $reporting,
            $searchCriteriaBuilder,
            $request,
            $filterBuilder,
            $meta,
            $data
        );
    }

    public function getData()
    {
        $data = parent::getData();
        foreach ($this->attributeRepository->getList() as $attributeCode => $attributeData) {
            foreach ($data['items'] as &$item) {
                if (isset($item[$attributeCode]) && !empty($attributeData[AttributeMetadataInterface::OPTIONS])) {
                    $item[$attributeCode] = explode(',', $item[$attributeCode]);
                }
            }
        }
        return $data;
    }
}