polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- `.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
- `read_csv`/`read_database` incorrectly converts naive datetime to UTC before applying timezone from a given schema
- let pl.Expr.reshape optionally take a tuple or 2 scalars rather than just a tuple
- docs(python): Remove y and mo from join_asof
- Docs
- Rust not yet supported