polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- .rolling(...).agg(...) ~20–40x slower ≥ 64 threads
- Grouped streaming AsOf join uses a lot of memory when the right side has many group matches wrt the left side
- feat(rust): Add PyO3-independent plugin crates
- fix(rust): Move `split_to_morsels` to shared so `ipc` builds without `parquet`
- docs(python): add warning about non-deterministic inputs to with_row_index
- feat(io): optimize single-put buffering in InternalCloudWriter
- Parquet writer does not dictionary-encode Decimal columns
- to_date and strptime should raise when date is padded
- fix(rust): Don't panic in `rolling_*_by` when `by` contains nulls
- parquet scan/reads fail over HTTP for small files hosted with miniserve
- Docs
- Rust not yet supported