All lots of fun, but kdb has an eye watering cost of 200k dollars per year per server.

Here's hoping some combo of Apache Arrow (also cache aware, much more language stack flexibilty), Aerospike (lua built in), Impala, and others, can finally take on this overpriced product, which has had a lack of serious competitors for 20 years, owing to its (price inelastic) finance client base.