polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Implement `DataType.serialize/deserialize` for serializing to/from JSON
- map_groups has inconsistent behavior between lazy and eager. It should also accept expressions.
- optional `file_index:int` column when using `source:list[str] | list[Path]` with `scan_*`
- Make head(), tail() and limit() return the same number of rows for Expr, Series, DataFrame and LazyFrame
- JoinArgs.suffix doesn't work when using LazyFrame.join
- Raise error in str.replace and str.replace_all when referencing non-existent capture groups
- Cannot use very large/small Datetime values
- Scan Parquet .collect() on Azure Blobs fails when column in different order. ShapeError: unable to vstack, column names don't match
- Meta-issue: improving CSV reading and writing
- feat(python): improve large Enum reprs
- Docs
- Rust not yet supported