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A null run is replaced by its hidden payload · case 04

A null run is replaced by its hidden payload.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Decode a run-end vector into the requested [start,start+length) slice. Run ends are exclusive cumulative positions; values and validity are stored per run. Empty slices return empty.

Why this case matters

A bounded deterministic data engine model makes representation and changelog faults reproducible.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
null middle run	`[4, 5, 5, 6, 6]`	`[4, null, null, 6, 6]`	Failed

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