polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Panic when melting since 0.19.14
- Unable to `scan_parquet` a table where some of the files have columns of List[null] and some of the files have columns that conflict with datatype of List[f64]
- Polars verbose mode should provide more information about IO operations
- Option for polars.DataFrame.to_dicts to skip null fields entirely
- Add set operations (intersection, difference, union, ...) to Series and Expr
- OOM errors with scan_pyarrow_dataset > fetch > limit
- Polars ~20x slower than pandas in DataFrame creation for `list[...]` columns using generators
- `cast` and other parsers should handle whitespace consistently
- Read index oriented json
- Utilize parquet's PageIndex for more efficient IO/faster queries
- Docs
- Rust not yet supported