No idea about the history. From my perspective (as the author of OctoSQL): I need a SQL parser. Vitess has a fully fledged MySQL compatible one. I'd probably w

No idea about the history. From my perspective (as the author of OctoSQL): I need a SQL parser. Vitess has a fully fledged MySQL compatible one. I'd probably want to copy the open source vitess one and add the necessary features myself, instead of writing it from scratch. It's just a big endeavor, a few thousand lines of goyacc code and even more Go boilerplate. I'm not saying everybody is using the same library, because the code has been heavily modified after being copied. A look at the cockroachdb parses suffices to see how much changed it is. If you look at OctoSQL, there too have been many changes to add stuff like table valued functions.