MariaDB support for null in parser

[thanasisxan]

When using MariaDB 10 and define a parser for a specific field that returns null under certain conditions, the row is populated with 'NULL' as string literal in the table. The parser looks like this:

$set->parsers = [
            'image_path' => function ($value) {
                return $value == 0 ? null : strtoupper($value).'.jpg';
            },
]

In MySQL 8 and PostgreSQL 15 it works as expected and database NULL is inserted.

[bfinlay]

I am looking into this.

I need to add some more test cases for null.

[bfinlay]

This issue is fixed in release 3.4.1.

Let me know if it worked for you.

Closing issue as complete, but feel free to add comments if something is still not working.