HF RL Explorer

Feature Request: Add roaring bitmap select to Retrieve Element by Rank

Feature Request: Add roaring bitmap select to Retrieve Element by Rank: a task in LegoFlow-SWE (Harbor dataset). Currently, there is no efficient way to obtain an element from a roaring bitmap by its rank (its position in the sorted order of elements). Users need a function that, given a rank k …

The task

Currently, there is no efficient way to obtain an element from a roaring bitmap by its **rank** (its position in the sorted order of elements). Users need a function that, given a rank *k*, returns the *k‑th* smallest element in the bitmap. This is a common operation for rank/select queries on compressed bitmaps.

Part of Lego-X/LegoFlow-SWE.