Clickhouse based query engine

[jeffling]

Forgive me if this is not the place for ideas, but this is something I've been looking at, and discovering Tansu today made me think it would be a great fit.

A ReplacingMergeTree table in clickouse is essentially an auto-compacting topic, and works in an append-only fashion very efficiently. Using an OLAP engine would also have the advantage of great compression and fast scans compared to postgres. I think it's a great fit, so just tossing this idea in the ring.