polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- fix: Support varying quantiles per group in group_by aggregation
- ChildProcessCrashException (0xC0000005) with Dagster on Windows in VS Code debug mode — regression in >= 1.32.2
- Accept arrow schema / field for `DataFrame.to_arrow()/Series.to_arrow()`
- Export using `arrow_schema` with `nullable: false` on list values array raises on NULL values masked out on the list level
- sink_delta out of memory while sink_parquet works fine
- Implement predicate pushdown for aliased groupby queries
- Build pyarrow predicates via pyarrow API instead of string formatting / eval in `predicate_to_pa`
- Insert IR-level slice before `select(all().head/tail(N)/first/last)`
- Optimize `get_ranges()` for IPC from S3
- Big-endian correctness gaps in Arrow view/aligned-bytes/bitmap internals
- Docs
- Rust not yet supported