Cannot assign variable to group_concat_max_len

In MySQL, this is perfectly valid:

set @t = @@group_concat_max_len;
set @@group_concat_max_len = @t;

In Single Store, the second assignment fails with this error

SQL Error [1064] [42000]: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘@t’ at line 1

None of these syntaxes work, either:

set @@group_concat_max_len = (select @t);
select @t into @@group_concat_max_len;

I can only assign constants to that flag, it seems:

set @@group_concat_max_len = 1234;

I’m using the latest version from docker hub:

Which corresponds to the tag alma-7.8.9-e94a66258d-4.0.7-1.13.9

Hi Lukas! :wave:

Thank you for bringing this to our attention. Will pass this on to the internal team to update. We appreciate our community members providing feedback. Much appreciated! :dizzy: