QueryBuilder.php

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<?php
namespace Magento\Framework\DB;

class QueryBuilder
{
    protected $select;

    protected $criteria;

    protected $resource;

    protected $mapperFactory;

    protected $queryFactory;

    public function __construct(
        \Magento\Framework\DB\MapperFactory $mapperFactory,
        \Magento\Framework\DB\QueryFactory $queryFactory
    ) {
        $this->mapperFactory = $mapperFactory;
        $this->queryFactory = $queryFactory;
    }

    public function setCriteria(\Magento\Framework\Api\CriteriaInterface $criteria)
    {
        $this->criteria = $criteria;
    }

    public function setResource(\Magento\Framework\Model\ResourceModel\Db\AbstractDb $resource)
    {
        $this->resource = $resource;
    }

    public function create()
    {
        $mapper = $this->criteria->getMapperInterfaceName();
        $mapperInstance = $this->mapperFactory->create($mapper);
        $select = $mapperInstance->map($this->criteria);
        $query = $this->queryFactory->create(
            \Magento\Framework\DB\Query::class,
            [
                'select' => $select,
                'criteria' => $this->criteria,
                'resource' => $this->resource
            ]
        );

        return $query;
    }
}