Impressive, love it, many thanks!

CedrarDB [0] (commercialization of Umbra [1] research DB) would be an interesting contender. The group creating Umbra researches on JSON representations in column stores, see [2].

[0] https://cedardb.com/ (commerciUmbra) [1] https://umbra-db.com/ [2] https://db.in.tum.de/~durner/papers/json-tiles-sigmod21.pdf