polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- DataFrame.rolling produces incorrect result if window boundaries are not monotone
- scan_parquet combines naive and UTC datetime files without error; the time zone is dropped or applied depending on file order
- Support stateful, ordered streaming operators (plugins or lazy UDFs)
- pl.Expr JSON serialization writes non-finite float literals (NaN, inf, -inf) as null, which then fails to deserialize
- chore: Overhaul nix flake and check it in CI
- Exact accumulation for `mean`
- Exact `median` for integer and temporal dtypes
- Exact temporal `rolling_mean`
- `arr.median` returns Float64 for temporal inner types
- Consistent JSON reading of Struct and Map
- Docs
- Rust not yet supported