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Unpivot materializes absent columns as explicit null values · case 03

Unpivot materializes absent columns as explicit null values.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Unpivot selected columns of record dictionaries into [id,column,value] rows. Include explicitly present None values, skip absent columns, respect requested column order and repetitions, and retain parent 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
missing field	`[[9, "a", 3], [9, "b", null]]`	`[[9, "a", 3]]`	Failed

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