Rust Polars Series compare to scalar not working - rust

Question

I am trying to figure out, why the sample code does not work?
This is in my toml file:
polars = "*"
This is the sample from Polars Eager cookbook:
use polars::prelude::*;
fn main() {
let s = Series::new("a", &[1, 2, 3]);
let ca = UInt32Chunked::new("b", &[Some(3), None, Some(1)]);
println!("{:?}", s.eq(2));
println!("{:?}", ca.eq(2));
}
It looks like the "eq" function is not properly overloaded?! I am getting the following errors:
error[E0308]: mismatched types
--> src\main.rs:7:27
|
7 | println!("{:?}", s.eq(2));
| -- ^ expected `&polars::prelude::Series`, found integer
| |
| arguments to this function are incorrect
|
note: associated function defined here
--> C:\Users\rnio\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib/rustlib/src/rust\library\core\src\cmp.rs:228:8
|
228 | fn eq(&self, other: &Rhs) -> bool;
| ^^
error[E0599]: `ChunkedArray<UInt32Type>` is not an iterator
--> src\main.rs:9:25
|
9 | println!("{:?}", ca.eq(2));
| ^^ `ChunkedArray<UInt32Type>` is not an iterator
|
::: C:\Users\rnio\.cargo\registry\src\github.com-1ecc6299db9ec823\polars-core-0.22.7\src\chunked_array\mod.rs:143:1
|
143 | pub struct ChunkedArray<T> {
| -------------------------- doesn't satisfy `ChunkedArray<UInt32Type>: Iterator`
|
= note: the following trait bounds were not satisfied:
`ChunkedArray<UInt32Type>: Iterator`
which is required by `&mut ChunkedArray<UInt32Type>: Iterator`

Answer 1

Thanks to #isaactfa ... the current workaround is to convert the Series to a ChunckedArray before comparisons.
Here is a working code:
use polars::prelude::*;
fn main() {
let s = Series::new("a", &[1, 2, 3]);
let ca = UInt32Chunked::new("b", &[Some(3), None, Some(1)]);
println!("{:?}", s.i32().unwrap().equal(2));
println!("{:?}", ca.equal(3));
}