polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- `list.agg(pl.element().explode())` shifts values into the wrong rows
- Polars 2 regression: `collect()` needs ca. 5x the memory and time of Polars 1.44 for `.over()` aggregates, leading to OOM kills
- perf: Compute group-by keys that are derived from other keys after the aggregation
- fix: Validate input dtype of `str`, `dt`, `bin` and `cat` namespace functions during schema resolution
- `scan_delta` filter on a struct column fails with "cast from `struct[1]` to `struct[5]`" when Delta stats cover only some of the struct's fields
- Support reading encrypted Iceberg tables
- rolling_corr and rolling_cov lose all precision on data far from zero, such as prices
- Streaming engine doesn't error on mismatched length when the input data has one row
- fix: allow `scan_delta` filter on struct columns with partial Delta stats
- `str.contains(regex=True)` OR-chains slower on 1.44.0+/2.0.0 vs 1.43.2
- Docs
- Rust not yet supported