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Projection evaluates expressions in key order · case 05

Projection evaluates expressions in key order.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Evaluate projection expressions over row IDs. Expressions are [kind,key] with stable, volatile, or row. A deterministic counter starts at seed and increments on each stable first call or volatile call; stable calls cache by key for the whole query. Row expressions return the current row ID. Preserve expression and row 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
mixed expression order	`[[9, 6, 7]]`	`[[6, 9, 7]]`	Failed

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