polars
https://github.com/pola-rs/polars
Rust
Dataframes powered by a multithreaded, vectorized query engine, written in Rust
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- Issues
- SOLUTION IN COMMENTS: write_parquet() using pyarrow with a "partition_cols" of type "str" maps all partition values to "...". This is NOT an issue in pyarrow.parquet.write_to_dataset
- JSON Error should also report line
- Implement a read_parquet_batched (similar to read_csv_batched) for parquet files.
- expose utility methods for creating Arrays from slices.
- InvalidOperation(ErrString("It is not possible to concatenate arrays of different data types."))
- Object Series with string elements converts to pyarrow FixedSizeBinaryArray, not LargeStringArray
- polars.DataFrame.join: Add information on the source of each row.
- Selecting null values from an object column makes the process unresponsive
- Support for the default datetime fmt when using .cast(pl.Datetime)
- dtype is upcasted silently in `list.concat`
- Docs
- Rust not yet supported