Polars Series in Rust

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

:timing
:sccache 1
:dep polars = { version = "0.21.1", features = ["lazy", "parquet"] }

use polars::prelude::*;

ChunkedArray¶

let s: Series = [10, 20, 30].iter().collect();
s

shape: (3,)
Series: '' [i32]
[
	10
	20
	30
]

s.len()

3

s.get(2)

Int32(30)

match s.get(2) {
    AnyValue::Int32(x) => x,
    _ => panic!(),
}

30

Convert a Series to a ChunkedArray.

{
    let ca = s.i32().unwrap();
    ca
}

shape: (3,)
ChunkedArray: '' [Int32]
[
	10
	20
	30
]

Get the first element of the ChunkedArray.

{
    let ca = s.i32().unwrap();
    ca.get(0)
}

Some(10)