ColumnsRenderer.php

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

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

class ColumnsRenderer implements RendererInterface
{
    protected $quote;

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

    public function render(Select $select, $sql = '')
    {
        if (!count($select->getPart(Select::COLUMNS))) {
            return null;
        }
        $columns = [];
        foreach ($select->getPart(Select::COLUMNS) as $columnEntry) {
            list($correlationName, $column, $alias) = $columnEntry;
            if ($column instanceof \Zend_Db_Expr) {
                $columns[] = $this->quote->quoteColumnAs($column, $alias);
            } else {
                if ($column == Select::SQL_WILDCARD) {
                    $column = new \Zend_Db_Expr(Select::SQL_WILDCARD);
                    $alias = null;
                }
                if (empty($correlationName)) {
                    $columns[] = $this->quote->quoteColumnAs($column, $alias);
                } else {
                    $columns[] = $this->quote->quoteColumnAs([$correlationName, $column], $alias);
                }
            }
        }
        return $sql . ' ' . implode(', ', $columns);
    }
}