polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Large memory usage due to (duplicated?) list data in a join
- Memory leakage in `read_parquet` when not using pyarrow since polars 1.28
- `jemalloc` future/replacement?
- `list.eval(pl.element().fill_null())` doesn't work on empty DataFrames
- `pl.lit(series)` does not create a scalar value
- Polars scan_parquet only infers schema from first file
- Add `exact: bool` parameter to `sample`, and default to approximate sampling
- add a iter_samples function
- feat: Allow customizing explain output for debugging custom io sources
- KeyboardInterrupt re-raised in except block when query is cancelled
- Docs
- Rust not yet supported