Read TSV files with Rust.

load_tsv.rs

use polars::prelude::*; // cargo add polars

pub fn load_tsv(file_path:&PathBuf) -> DataFrame {
    let mut df = CsvReader::from_path(file_path)
                .unwrap()
                .with_delimiter(b'\t')
                .infer_schema(None) // if None polars look through all data, so when loading big data it probably takes long time. You can limit the records polars will look into.
                .has_header(false) // if it has then 'true'
                .finish()
                .unwrap();

    df.set_column_names(&["Breakfast", "Lunch", "Dinner", "Sum"]).unwrap(); // if tsv has a header comment this out.
    
    df
}