TIL how ClickHouse works with Parquet beyond just reading files.

Part 1: https://clickhouse.com/blog/apache-parquet-clickhouse-local-querying-writing You can query and even write Parquet files directly using ClickHouse, without fully importing them first. This changes how you think about data movement and storage.

Part 2: https://clickhouse.com/blog/apache-parquet-clickhouse-local-querying-writing-internals-row-groups Row groups are the basic units inside Parquet. Performance depends a lot on how data is divided into these groups, affecting how much data gets read, how well it compresses, and how efficiently queries run.