where clause with length

How do I have a where clause with a length, e.g.

select * from data where length(prodcode) = 3

I've managed to do it like this:

where(sqllength(product_cd), "=", 4)

Type-safe and extensible way: https://kyse.link/?p=s&i=ucs9UpJeiJAhAc69C9gv

Or simply https://kyse.link/?p=s&i=xtAnYYuk0pDFwymOAi2i

No need to use ref in the function arguments. They are references by default

Thank you, will try them