包的介绍：
Polars is a DataFrame library for Rust. It is based on Apache Arrows memory model. This means that operations on Polars array's (called Series or ChunkedArray<T> {if the type T is known}) are optimally aligned cache friendly operations and SIMD. Sadly, Apache Arrow needs nightly Rust, which means that Polars cannot run on stable.
Polars supports an eager and a lazy api. The eager api is similar to pandas, the lazy api is similar to Spark.
github地址：
https://github.com/ritchie46/polars
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