polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- perf: Probe in-flight byte budget for cloud reads
- Parquet writer: dictionary-encodes high-cardinality columns where plain is much smaller; no way to opt out per column
- Polars List type in sink_parquet discards Pyarrow metadata
- Support for DenseUnion type
- fix(io): clear scratch buffer in scientific decimal_comma float CSV serializer (#29641)
- Performance regression in 2.0.0
- feat(rust): Implement `TryFrom<&Path>` and `TryFrom<PathBuf>` for `PlRefPath`
- Panic in scan_parquet when filtering on a struct field if the struct contains a Datetime/Date field
- Improve IO pipeline for Parquet/IPC on S3
- perf: Increase prefetch window for ordered Parquet and IPC scans
- Docs
- Rust not yet supported