arrow_ord::rank

Function rank

Source 
pub fn rank(
    array: &dyn Array,
    options: Option<SortOptions>,
) -> Result<Vec<u32>, ArrowError>
Expand description

Assigns a rank to each value in array based on its position in the sorted order

Where values are equal, they will be assigned the highest of their ranks, leaving gaps in the overall rank assignment

let array = StringArray::from(vec![Some("foo"), None, Some("foo"), None, Some("bar")]);
let ranks = rank(&array, None).unwrap();
assert_eq!(ranks, &[5, 2, 5, 2, 3]);