I broadly classify them as such since the former has a stronger disposition towards linear/tensor-algebra, while the latter towards relational algebra, and it isn't yet clear (to me) how well innovations in one carry over to the other (if they do), and hence I'm also curious to hear more about proposals for a unified language across linalg and relational alg (e.g. https://news.ycombinator.com/item?id=36349015).
That's cool, thanks for sharing! Do you know how close they are to their example use cases [1]? So far I've only been able to find a tool for calcite SQL parsing [2] but not the portion connecting to Arrow C++ compute kernel yet.