polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Avro reader/writer cannot roundtrip chunked structs
- read_csv() does not support `file:///tmp/foo.csv` fsspec URLs while scan_csv() does
- add a `pipeline` function that would be like pipe but take multiple funcs
- `.list.unique` takes exceedingly long compared to `pl.col('x').list.set_union('x')`
- Filter predicates mis-parsed for pyarrow-based LazyFrames: parses backslash `\` as an escape character
- LazyFrame.with_context() broadcasting
- Let `scan_delta` take a DeltaTable object instead of just string
- Compute-on-the-fly join (type?)
- Slow `cum_count` with `over()`
- Explicitly ordered Nominal and Ordinal Categorical Variables
- Docs
- Rust not yet supported