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Struct projection ignores a gathered row selection · case 03

Struct projection ignores a gathered row selection.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Project requested fields from a struct array. Parent validity dominates field validity, absent schema fields materialize None, selection retains row order, and projection retains requested field order.

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
gather with field order	`[[5, 3], [6, 4]]`	`[[6, 4], [5, 3]]`	Failed

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