polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Constant folding replicates rules from the engine and leaves many gaps unimplemented
- NDJSON reader panics on Int8/Int16/UInt8/UInt16/Time/Duration schema types
- perf: Native gather for List arrays
- perf: Explode lists in group_by aggregations without a per-group apply
- Unique after gather on 2-D array with null incorrect.
- `list.agg(pl.element().explode())` shifts values into the wrong rows
- 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
- Docs
- Rust not yet supported