Function refresh_picker_output 

fn refresh_picker_output(
    output: PickerOutput,
    current: &SstVersion,
) -> Option<PickerOutput>

Rebuilds picker output with current SST handles while preserving the picker’s grouping.

Picking runs in background on a version snapshot that may be stale by the time the plan is accepted: a concurrent flush, compaction or index rebuild can replace a selected file with a new handle carrying updated metadata (e.g. index_version), or remove the file entirely. The handles in the picker output therefore cannot be used as-is; re-resolving them against the current version both detects gone files (aborting the plan) and ensures the execution reads and reserves the up-to-date handle.