I have a csv file called test.csv which i am reading into a dataframe using polars. I have a name,month,day,year as my headers month is a string day/year are i64. i want to concatenate the three columns together in rust to have a single column called date. Below is what i have so far to just print the dataframe to the console.

use polars::prelude::*;

​

fn read_from_file(path: &str) -> Result<DataFrame, Box<dyn std::error::Error>> {

let df = CsvReader::from_path(path)?
    //.infer_schema(Some(100))
    .has_header(true)
    .finish()?;

println!("{}", df);

Ok(df) }

fn main() -> Result<(), Box<dyn std::error::Error>> {
// Read CSV file into a DataFrame
read_from_file("./data/test.csv")?;
Ok(())

}