AliasResolver.php

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<?php
namespace Magento\CatalogSearch\Model\Adapter\Mysql\Filter;

use Magento\CatalogSearch\Model\Search\RequestGenerator;

class AliasResolver
{
    const STOCK_FILTER_SUFFIX = '_stock';

    public function getAlias(\Magento\Framework\Search\Request\FilterInterface $filter)
    {
        $alias = null;
        $field = $filter->getField();
        switch ($field) {
            case 'price':
                $alias = 'price_index';
                break;
            case 'category_ids':
                $alias = 'category_ids_index';
                break;
            default:
                $alias = $field . RequestGenerator::FILTER_SUFFIX;
                break;
        }
        return $alias;
    }
}