@Robby - Awesome introduction to DuckDB! I have been reading about it and have been doing some basic PoCs using DuckDB lately. I'm not sure how many databases have actually implemented the EXCLUDE keyword. I think it's a novelty in DuckDB. With ClickHouse, Druid, and now DuckDB (and maybe some more), I think there are plenty of really good open-source OLAP engines to choose from.