polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Categorical chunks returned by collect_batches() have differing dictionaries when exported via to_pandas()
- fix(python): Fix a few typos in the docstrings
- fix(python): Fix some type hints and type aliases
- Consider removing the pyarrow dependency for to_pandas() (numpy backed)
- Memory regression in 1.42.0: async Parquet prefetch count raised to 512 → ~2× peak RAM on streaming scan_parquet → sink_parquet, OOMs scripts that worked on 1.41.2
- fix(rust): Avoid dedup-name collision when a generated header already exists
- Add filter predicates to with_column/select literal generation for filter expression optimisation
- Add warning to documentation of `with_row_index` about non-deterministic inputs
- Apply filters in order based on selectivity in parquet scan
- fix(python): Modify list function so first argument is positional-only
- Docs
- Rust not yet supported