polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- the out-of-core memory estimate is permanently eroded by thread churn, disabling spilling
- perf: Start writeback per row group instead of at file close
- Wrapping a PyCapsule-interface Arrow array with an extension type backed by Dictionary-typed storage fails with `ComputeError("Dictionary Array must contain a dictionary in ffi")`
- fix(rust): Fix constructing a Polars array around an Arrow PyCapsule array of extension-on-dictionary type
- perf: Optimize `rolling_min` and `rolling_max` with a van Herk block scan
- fix: Report failing object path in object-store error
- Stale path on ObjectStore error
- Predicate pushdown into `scan_parquet` evaluates the predicate on truncated string/binary column statistics and fails
- DuplicateError when a LazyFrame from `scan_parquet` is reused after a query that joined it with its own `with_row_index`
- `strptime` with `strict=False` still raise error when format is inferred from the data
- Docs
- Rust not yet supported