polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- init dataframe with all columns as string data type
- RFC: `pl.Categories` and Streaming Compatible Categoricals
- RFC: DataType expressions
- 2× CSV Parsing performance regression introduced after version 1.10.0
- Duration `std` aggregation is not implemented for new streaming engine.
- Error: `DSL_SCHEMA_HASH` is not compatible, can't deserialize DSL with incompatible schema
- SchemaMismatch(ErrString("cannot build list with different dtypes \n\nExpected list[f32], got f64.")
- Significant slowdown in conversion from arrow with categoricals post 1.32.0
- Rare S3 `scan_parquet` deadlock
- Polars - Discard option in scan_parquet
- Docs
- Rust not yet supported