Function rank_int 

pub fn rank_int<T: Ord + Copy>(window: IntegerAVT<'_, T>) -> IntegerArray<i32>

Computes standard SQL ROW_NUMBER() ranking for integer data with tie handling.

Assigns sequential rank values to elements based on their sorted order, providing standard SQL ROW_NUMBER() semantics where tied values receive different ranks. Essential for analytical queries requiring unique positional ranking.

Parameters

• window - Integer array view containing values for ranking

Returns

Returns an IntegerArray<i32> containing:

• Rank values from 1 to n for valid elements
• Zero values for null elements
• Null mask indicating which positions have valid ranks

Ranking Semantics

• ROW_NUMBER() behaviour: Each element receives a unique rank (1, 2, 3, …)
• Tie breaking: Tied values receive different ranks based on their position
• Ascending order: Smaller values receive lower (better) ranks
• Null exclusion: Null values are excluded from ranking and receive rank 0

Use Cases

• Analytical queries: SQL ROW_NUMBER() window function implementation
• Leaderboards: Creating ordered rankings with unique positions
• Percentile calculation: Basis for percentile and quartile computations
• Data analysis: Establishing ordinality in integer datasets

Examples

use minarrow::IntegerArray;
use simd_kernels::kernels::window::rank_int;

let arr = IntegerArray::<i32>::from_slice(&[30, 10, 20, 10]);
let result = rank_int((&arr, 0, arr.len()));
// Output: [4, 1, 3, 2] - ROW_NUMBER() style ranking