polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- `DataFrame.map_rows` is slower than iterating "manually" over rows.
- Expr for dtype assertion
- `map_elements` with return_dtype=pl.Float32 fails to cast from pl.Float64
- Sort on already sorted DataFrame causes unnecessary rechunk
- Panic from slicing a list of structs containing an Enum field
- Incorrect results when using `group_by` column on `quantile`
- Support holiday expressions for business day operations
- pl.from_epoch() timezone support
- Fragmentation issues using `read_ipc` or `scan_ipc`.
- DataFrame.partition_by should support expressions and not just existing columns
- Docs
- Rust not yet supported