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
- fix: Return error instead of panicking when casting/displaying out-of-range datetimes
- Avoid materializing broadcast scalar Arrays in arr.dot streaming
- Improve "disable morsel split" optimization pass
- Nested CSPE prevents predicate pushdown to scans
- feat(python): Expose the registered IO source on the scan function
- Docs: clarify meaning of `ambiguous` in `str.to_datetime` (and other docstrings where `ambiguous` appears)
- Docs
- Rust not yet supported