polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- Reading AVRO using columns doesn't maintain the correct columns
- readJSON Fails on JSON with Newline Characters
- In `cast()`, the argument `wrap_numerical` works differently on floats and integers
- Crash when using write_parquet
- Support BigQuery client or URI in database I/O functions
- Severe memory issues with `rolling` and `group_by`
- StringCacheMismatchError when using joblib.Parallel and Categorical data
- Expr.rank() function changed to unstable sort in polars >=1
- Significant performance difference depending on how I use the "filter" method
- computation of list.len for null list seems incorrect
- Docs
- Rust not yet supported