Function polars::functions::argsort_by

pub fn argsort_by(
    by: &[Series], 
    reverse: &[bool]
) -> Result<ChunkedArray<UInt32Type>, PolarsError>

Find the indexes that would sort these series in order of appearance. That means that the first Series will be used to determine the ordering until duplicates are found. Once duplicates are found, the next Series will be used and so on.