Spark is still a safe port when compared to DuckDB and Polars

mertkavi.com

2 pointsmertkavi3 comments

I'm a developer of ClickHouse, and I can proudly say that the system's performance, feature completeness, usability, and maturity are second to none.

Just for my curiosity, Is the clickhouse internal columnar file format documented somewhere?

Not much - the source code contains a brief description. See MergeTreeData.h, MergeTreeDataPartWide, MergeTreeDataPartCompact.