polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- POLARS_MAX_THREADS=1 slower with subprocess since 1.42.0
- perf: Skip the expression engine for eager `repeat` with scalar literals
- `pd.Timestamp` loses `ns` precision and can underflow when ingested into Polars
- `collect_async` and `collect_batches` silently run on the CPU when GPU is selected
- Improve "disable morsel split" optimization pass
- Nested CSPE prevents predicate pushdown to scans
- Raise a clear error for multiple iterable positional expressions in select/with_columns/agg
- MemoryLeak in conjunction with SqlAlchemy when rows are not consumed with .all()
- fix(python): default `show_graph` physical plan to the streaming engine
- Add `seek(0)` hint to `BufferIO()` read errors in 2.0
- Docs
- Rust not yet supported