DefaultHandler.php

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<?php
namespace Magento\Framework\Indexer\Handler;

use Magento\Framework\App\ResourceConnection\SourceProviderInterface;
use Magento\Framework\Indexer\HandlerInterface;

class DefaultHandler implements HandlerInterface
{
    public function prepareSql(SourceProviderInterface $source, $alias, $fieldInfo)
    {
        $source->getSelect()->columns($fieldInfo['origin'] . ' AS ' . $fieldInfo['name'], $alias);
    }
}