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Unpivot deduplicates repeated selected columns · case 02

Unpivot deduplicates repeated selected columns.

Member previewVariant 2 · 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
duplicate column	`[[9, "a", 2]]`	`[[9, "a", 2], [9, "a", 2]]`	Failed

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