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Constant vector materializes the first selection-length rows · case 03

Constant vector materializes the first selection-length rows.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Materialize a constant vector over a requested logical length, combining scalar validity with row validity. A selection chooses logical rows and may repeat them. Return [row-index,value-or-null] for every selected row; scalar zero is a valid value.

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
selected validity	`[[0, 3], [1, null], [2, 3]]`	`[[2, 3], [1, null], [0, 3]]`	Failed

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