Hi, This is regarding my question about the datafusion's vision and roadmap.
As a new contributor, I wonder what would be a vision and roadmap that most of the contributors can/already have be aligned upon. Maybe due to my lack of prior context I might have missed such discussion, or maybe this is intentionally left to be open so that different contributors and companies can have their own features to be compatible. But I still believe in the value of having one, and it can somehow be shown in the README.md or contributing guideline, so that users and the community can see what to expect from and contribute to. By "vision" I mean something that's necessarily vague and serving as an overarching goal, e.g. "leveraging rust and arrow and become the most performant SQL-compatible query engine on a single node", or "fully compatible with (most of) PostgreSQL syntax and pluggable in most of the web-scale analytical engines". I believe having this in place can help pushing the project forwards esp. in cases of trade off, e.g. sticking to newest rust release v.s. providing LTS, or incorporating as many features as possible (e.g. recursive CTE? BSON support? query materializations?) v.s. keeping binary size small and everything else into a plugin mode.
