polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Allow join on different types if upcast is safe
- Support `group_by_dynamic` in streaming engine
- process crashes with `memory allocation failed` when reading small parquet file
- Add `check_sorted` parameter to `join_asof` that defaults to `False`
- Minimal tests for memory usage contraints in partial-column read APIs
- Parquet row group filter pushdown not working as expected
- Larger integer value can not be found when using Parquet files with statistics
- Expand metadata to be able to track multi-column and group sort status + add lazyframe method to check whether a group or multicolumns are sorted
- Some S3 difficulties
- `offset_by` raises ambiguous datetime error for day light time change
- Docs
- Rust not yet supported