buildRaw() with duplicated column name

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Information

• Version of Medoo: 2.1.7
• Version of PHP: 7.3
• Type of Database (MySQL, MSSQL, SQLite...): MySQL
• System (Liunx|Windows|Mac): Windows 10

Describe the Problem
Column names other than the first disappear.

Detail Code
table test

os
win
mac
win
ios

$db->get('test', ['pc'=>Medoo::raw("count(<os>='win' OR <os>='mac' OR NULL)")]);

SQL with the second "os" column disappeared is executed

SELECT count("os"='win' OR ='mac' OR NULL) AS `pc` FROM `test` LIMIT 1

desired SQL

SELECT count("os"='win' OR "os"='mac' OR NULL) AS `pc` FROM `test` LIMIT 1

Solution I tried

I thought there was a problem with the "buildRaw" method

the value of the variable in buildRaw method

[$raw->value]
count(<os>='win' OR <os>='mac' OR NULL)

[$matches]
Array
(
    [0] => <os>
    [1] => 
    [2] => 
    [3] => 
    [4] => 
    [5] => os
    [6] => os
)
Array
(
    [0] => 'win' OR <os>='
    [1] => 'win' OR 
    [2] => '
    [3] => 
    [4] => 
    [5] => os
    [6] => os
    [7] => 
    [8] => ='
)

[$query]
count("os"='win' OR ='mac' OR NULL)

"os" is missing here

This issue was resolved by doing the following.

            function ($matches) {
                // add && empty($matches[5])
                if (!empty($matches[2]) && isset($matches[8]) && empty($matches[5])) {
                    return $matches[0];
                }

                if (!empty($matches[4])) {
                    return $matches[1] . $matches[4] . ' ' . $this->tableQuote($matches[5]);
                }

                // add . ($matches[8]??'')
                return $matches[1] . $this->columnQuote($matches[5]) . ($matches[8]??'');
            },