polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Opt-in short-circuit evaluation for when/then/otherwise
- parquet scan/reads fail over HTTP for small files hosted with miniserve
- Flag that disables pre-filtered parquet decode is unnecessarily strict
- fix(rust): Drop non-output columns from streaming equi and semi/anti joins
- docs(python): Note the NaN ordering footgun for median / quantile
- perf: Add dedicated kernel for `concat_list`
- Categorical chunks returned by collect_batches() have differing dictionaries when exported via to_pandas()
- fix(python): Fix some type hints and type aliases
- 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
- Docs
- Rust not yet supported