polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- write_batch_size and max_file_size for parquet
- Strange behavior of bool columns in dataframe
- Rolling_min/max incorrectly propagate NaNs, and no non-propagating option is available
- API: inconsistent column expansion in group_by: `pl.col('a', 'b')` vs `pl.nth(0, 1)` vs `pl.all()`
- Loading the same file multiple times causes changes in values using polars, but not when using pandas
- Add WriteResult / SinkResult which could include written file paths
- Eventual crash from collecting pyarrow dataset: `libc++abi: terminating due to uncaught exception of type std::__1::system_error: condition_variable wait failed: Invalid argument`
- Add python-like zip for list columns
- Add maps_as_pydicts equivelant to `from_arrow`
- Support Hugging Face in `read_json`
- Docs
- Rust not yet supported