Thanks for clarifying; I'm not trying to take anything away from you, I work in the OLAP space too so it's always good to see people pushing it forwards. It would be interesting to see a comparison of totally cold Vs hot caches.
Are you looking at distributed queries directly over S3? We did this in ClickHouse and can do instant virtual sharding over large data sets S3. We call it parallel replicas https://clickhouse.com/blog/clickhouse-parallel-replicas
(I submitted this link). My interest in this approach in general is about observability infra at scale - thinking about buffering detailed events, metrics and thread samples at the edge and later only extract things of interest, after early filtering at the edge. I’m a SQL & database nerd, thus this approach looks interesting.
Are you looking at distributed queries directly over S3? We did this in ClickHouse and can do instant virtual sharding over large data sets S3. We call it parallel replicas https://clickhouse.com/blog/clickhouse-parallel-replicas