Core: Database raw sql

Sometimes it is necessary to use a raw sql query as part of the main query.
I already suggested this, but as part of other changes. And now I would like to know your opinion on the implementation of this as an independent tool.

This solution will help bypass the unwanted raw sql processing and use it as is.

PHP Code:

class SQLExpression
{
    protected $query = '';

    /**
    * @param string $query
    */
    public function __construct(string $query)
    {
        $this->query = $query;
    }

    public function __toString(): string
    {
        return $this->query;
    }
}

function sql(string $query): SQLExpression
{
    return new SQLExpression($query);
} 


Usage

PHP Code:

$db->select(sql('a + b AS c'));
$db->from(sql('SELECT * FROM ....'));    
// etc 


// Raw sql detection

PHP Code:

public function from($from, bool $overwrite = false)
{
    if ($overwrite === true) {
        $this->QBFrom = [];
        $this->db->setAliasedTables([]);
    }

    // here detection

    if ($from instanceof SQLExpression)
    {
        $this->QBFrom[] = $from;
        
        return $this;
    }
    
    // ....
}