@1egg0myegg0 that's great to hear. I'll check to see if it applies to Arrow.
Another performance issue with DuckDB/Arrow integration that we've been working to solve is that Arrow lacked a canonical way to pass statistics along with a stream of data. So for example if you're reading Parquet files and passing them to DuckDB, you would lose the ability to pass the Parquet column statistics to DuckDB for things like join order optimization. We recently added an API to Arrow to enable passing statistics, and the DuckDB devs are working to implement this. Discussion at https://github.com/apache/arrow/issues/38837.
Another performance issue with DuckDB/Arrow integration that we've been working to solve is that Arrow lacked a canonical way to pass statistics along with a stream of data. So for example if you're reading Parquet files and passing them to DuckDB, you would lose the ability to pass the Parquet column statistics to DuckDB for things like join order optimization. We recently added an API to Arrow to enable passing statistics, and the DuckDB devs are working to implement this. Discussion at https://github.com/apache/arrow/issues/38837.