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Projection evaluates every row against the first source record · case 02

Projection evaluates every row against the first source record.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Evaluate ordered projection [output-name,input-name] pairs against each immutable input record, not earlier output aliases. Missing inputs yield None. Repeated output names occupy distinct result columns, and empty projections retain one empty result per input row.

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
multiple rows	`[[["z", 2]], [["z", 2]]]`	`[[["z", 2]], [["z", 3]]]`	Failed

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