I'd argue that golang is inherently not a systems language, with its mandatory GC managed memory. I think it's a poor choice for anything performance or memory sensitive, especially a database. I know people would disagree (hence all the DBs written in golang these days, and Java before it), but I think C/C++/Rust/D are all superior for that kind of application.

All of which is to say, I don't think it matters. Use the right tool for the job - if you care about generic overhead, golang is not the right thing to use in the first place.