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Position deletes use fragment-local row positions · case 04

Position deletes use fragment-local row positions.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Scan fragments [file-id,base-row-position,values] applying position-delete pairs [file-id,absolute-row-position]. Deletions are file-scoped and use physical positions before filtering. Return [file-id,absolute-position,value] for surviving rows, including null values.

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
fragment origin	`[["a", 0, 4], ["a", 1, 5]]`	`[["a", 6, 5]]`	Failed

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