How to increase group_concat max limit in mysql cloud instance?

If you're calling a view you can create a stored procedure that pulls the select itself and declare the length by session. This should be able to solve your problem if by any restriction that configuration cant be changed.

If you're calling a view you can create a stored procedure that pulls the select itself and declare the length by session. This should be able to solve your problem if by any restriction that configuration cant be changed.