I think it's more generalized distributed compute, with OLAP being one of the use cases. There are a lot of videos on YouTube if you search "Bacalhau cluster" or similar, including what appears to be their legacy channel [0] (which I saw a year ago and found very impressive) and a newer one [1], but also conference talks from other channels.
I haven't been following the project, but I remember finding the original demo to be very impressive - I don't remember the details off-hand, but IPFS was somehow involved. Seems like a lot of work has taken place since then. Docs are here [2]
[0] https://www.youtube.com/@bacalhau3295