[php-src] Issue #14918: pdo_mysql not returning int for `sum` aggregate function

Issue: https://github.com/php/php-src/issues/14918 Author: SamMousa ### Description The following code: ```php <?php var_dump($db->pdo->query(<<<SQL select sum(id), avg(id), json_type(sum(id)) from ( select 1 as id union select 2 as id ) as sub SQL, \PDO::FETCH_ASSOC)->fetch()); ``` Resulted in this output: ``` array(3) { 'sum(id)' => string(1) "3" 'avg(id)' => string(6) "1.5000" 'json_type(sum(id))' => string(7) "INTEGER" } ``` But I expected this output instead: ``` array(6) { 'sum(id)' => int(3) 'avg(id)' => float(1.5) 'json_array(sum(id))' => int(3) 'json_type(sum(id))' => string(7) "INTEGER" } ``` It seems the sum function does not result in a properly typed value. Upon further investigation: - avg also exhibits this behavior - I added a json_type column (which could be mariadb only) to see what the database engine thinks of the type - tested on version 8.3.? as well with mysql ### PHP Version 8.2.20 ### Operating System docker(alpine)