ConcatHandler.php

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

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

class ConcatHandler implements HandlerInterface
{
    protected $concatExpression;

    public function __construct(
        \Zend_Db_Expr $concatExpression
    ) {
        $this->concatExpression = $concatExpression;
    }

    public function prepareSql(SourceProviderInterface $source, $alias, $fieldInfo)
    {
        $source->getSelect()->columns([$fieldInfo['name'] => $this->concatExpression]);
    }
}