GroupRenderer.php

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<?php
namespace Magento\Framework\DB\Select;

use Magento\Framework\DB\Select;
use Magento\Framework\DB\Platform\Quote;

class GroupRenderer implements RendererInterface
{
    protected $quote;

    public function __construct(
        Quote $quote
    ) {
        $this->quote = $quote;
    }

    public function render(Select $select, $sql = '')
    {
        if ($select->getPart(Select::FROM) && $select->getPart(Select::GROUP)) {
            $group = [];
            foreach ($select->getPart(Select::GROUP) as $term) {
                $group[] = $this->quote->quoteIdentifier($term);
            }
            $sql .= ' ' . Select::SQL_GROUP_BY . ' ' . implode(",\n\t", $group);
        }
        return $sql;
    }
}