MariaDB & Doctrine DBAL 4 support

[eiderdaus]

MariaDB does not work when I use the doctrine-extensions and DBAL 4. In this combination, the following check in src/Oro/ORM/Query/AST/FunctionFactory.php fails:

    if ($platform instanceof PostgreSQLPlatform) {
        $platformName = 'postgresql';
    } elseif ($platform instanceof MySQLPlatform) {
        $platformName = 'mysql';
    } else {
        throw QueryException::syntaxError(
            \sprintf(
                'Not supported platform "%s"',
                $platform::class
            )
        );
    }

I get the error:

[Syntax Error] Not supported platform "Doctrine\DBAL\Platforms\MariaDB1052Platform"

It is because since DBAL 4, MariaDBPlatform does not extend MySQLPlatform anymore, but from AbstractMySQLPlatform.

Since DBAL 3, MySQLPlatform always extends from AbstractMySQLPlatform, so simply checking $platform instanceof AbstractMySQLPlatform instead of $platform instanceof MySQLPlatform should fix this for DBAL 4 and not break DBAL 3 at the same time.

Other than that, I had great success when testing the master branch! Probably after fixing this issue, an official release would be greatly appreciated :)

[tups]

Thank you for reporting this issue and providing the patch! I've created a PR here: #115

Now we'll need to wait for a maintainer to review it. I'm also experiencing this issue in my current project, so I'm hoping it gets reviewed soon.