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Recursive query joins frontier values to target rather than source · case 05

Recursive query joins frontier values to target rather than source.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Evaluate a bounded recursive UNION ALL query. Anchors are integer values; each frontier value joins all rules [source,target], preserving duplicate anchors and duplicate rules. Emit [depth,value] for depth zero through max-depth, expanding only the newest frontier. Preserve anchor and rule encounter 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
chain frontier	`[[0, 5]]`	`[[0, 5], [1, 6], [2, 7]]`	Failed

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