Parquet has a few compression option. Not sure which one they are using.
Plus isn't the least wasteful format, native duckdb for instance compacts better. That's not just down to the compression algorithm, which as you say got three main options for parquet.
Plus isn't the least wasteful format, native duckdb for instance compacts better. That's not just down to the compression algorithm, which as you say got three main options for parquet.