polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Poor error message "ComputeError: Series length 2 doesn't match the DataFrame height of 4"
- make reduce/fold agg friendly AND/OR make exprs parameter take list.
- Add time-based shifting to .shift method
- Add batching (`batches` / `batched`) to DataFrame
- read_csv() do not cast the dtype automatically
- Typehinting for columns
- Seeing different behavior of pl.read_csv across different RHEL versions (8.2.1 and 8.4.1)
- Minor inconsistency between casting to col.cast(pl.Utf8) and using col.map_elements(str) for struct columns
- Memory not being released after running the melt function
- Allow multiple positional arguments for `pl.scan_csv()`
- Docs
- Rust not yet supported