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.
There are very fast DB written in Go so this comment is irrelevant, what is the equivalent of https://github.com/VictoriaMetrics/VictoriaMetrics in an other language?