polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Regression: Incorrect categorical encoding
- Failing inner join with join_nulls=False on some hardware
- LazyFrame `type_coercion` breaks complex query output
- perf: Add fast paths for series.arg_sort and dataframe.sort + bug fix in existing fast path
- refactor: Implement nested row encoding / decoding
- Reading empty delta table panics
- `pl.concat()` output with Expr input is wrong when using the new streaming engine
- Document copy-on-write logic
- _select_column, getitem misinterprets 0d numpy array as multi-dimensional array
- fix: Fix panic with empty delta scan, or empty parquet scan with a provided schema
- Docs
- Rust not yet supported