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A projected struct field broadcasts its first lane · case 05

A projected struct field broadcasts its first lane.

Member previewVariant 5 · 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	`[[7, 5], [7, 5]]`	`[[8, 6], [7, 5]]`	Failed

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