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Project description
Polars
Blazingly fast DataFrames in Rust & Python
Polars is a blazingly fast DataFrames library implemented in Rust using Apache Arrow(2) as memory model.
- Lazy | eager execution
- Multi-threaded
- SIMD
- Query optimization
- Powerful expression API
- Rust | Python | ...
To learn more, read the User Guide.
Performance
Polars is very fast, and in fact is one of the best performing solutions available. See the results in h2oai's db-benchmark.
Rust setup
You can take latest release from crates.io
, or if you want to use the latest features/ performance improvements
point to the master
branch of this repo.
polars = {git = "https://github.com/ritchie46/polars", rev = "<optional git tag>" }
Rust version
Required Rust version >=1.52
Python users read this!
Polars is currently transitioning from py-polars
to polars
. Some docs may still refer the old name.
Install the latest polars version with:
$ pip3 install polars
Documentation
Want to know about all the features Polars support? Read the docs!
Rust
Python
- installation guide:
$ pip3 install polars
- User Guide
- Reference guide
Contribution
Want to contribute? Read our contribution guideline.
[Python] compile py-polars from source
If you want a bleeding edge release or maximal performance you should compile py-polars from source.
This can be done by going through the following steps in sequence:
- install the latest rust compiler
$ pip3 install maturin
- Choose any of:
- Very long compile times, fastest binary:
$ cd py-polars && maturin develop --rustc-extra-args="-C target-cpu=native" --release
- Shorter compile times, fast binary:
$ cd py-polars && maturin develop --rustc-extra-args="-C codegen-units=16 -C lto=thin -C target-cpu=native" --release
Note that the Rust crate implementing the Python bindings is called py-polars
to distinguish from the wrapped
Rust crate polars
itself. However, both the Python package and the Python module are named polars
, so you
can pip install polars
and import polars
(previously, these were called py-polars
and pypolars
).
Arrow2
Polars has a fully functional arrow2 branch and will ship the python binaries from this branch. Arrow2 is a faster and safer implementation of the arrow spec. Arrow2 also has a more granular code base, helping to reduce the compiler bloat.
Acknowledgements
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