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Chunk assembly treats repeated physical rows as duplicates · case 03

Chunk assembly treats repeated physical rows as duplicates.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Assemble two equally long logical columns from independent chunk layouts. Empty chunks carry no rows. Zip by global row ordinal, retain null values, and apply the requested half-open row slice after alignment.

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
repeated rows	`[[3, 4]]`	`[[3, 4], [3, 4]]`	Failed

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