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Join delta weights lose retraction signs · case 05

Join delta weights lose retraction signs.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Apply simultaneous signed changes to two bag relations. Emit the consolidated join delta Ldelta*Rold + Lold*Rdelta + Ldelta*Rdelta. Inputs are [key,value,weight]; ordinary non-null equality joins. Return sorted [leftvalue,rightvalue,weight] nonzero rows.

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
right retraction	`[[5, 6, 2]]`	`[[5, 6, -2]]`	Failed

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