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Pivot table column descriptor generation: tuple column key · case 02

The table tuple column key result violates the stipulated pivot table column descriptor generation contract.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Pivot columns use typed dimension tuples plus measure IDs as identity, deduplicate paths in encounter order, keep measure-specific visibility, distinguish missing/empty/zero dimensions in labels, and represent grand totals with empty ancestry and separately hideable measure keys.

Why this case matters

An offline table UI model isolates pivot table column descriptor generation, including adversarial row/column relationships.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
duplicate paths measures	[{"key": [["east", "2"], "sum"], "label": "east / 2 / Sales", "measure": "sum", "path": ["east", 2], "total": false}, {"key": [["east", "2"], "cnt"], "label": "east / 2 / Count", "measure": "cnt", "path": ["east", 2], "total": false}, {"key": [["west", "2"], "sum"], "label": "west / 2 / Sales", "measure": "sum", "path": ["west", 2], "total": false}, {"key": [["west", "2"], "cnt"], "label": "west / 2 / Count", "measure": "cnt", "path": ["west", 2], "total": false}, {"key": [["TOTAL"], "sum"], "label": "Total / Sales", "measure": "sum", "path": [], "total": true}, {"key": [["TOTAL"], "cnt"], "label": "Total / Count", "measure": "cnt", "path": [], "total": true}]	[{"key": [["east", 2], "sum"], "label": "east / 2 / Sales", "measure": "sum", "path": ["east", 2], "total": false}, {"key": [["east", 2], "cnt"], "label": "east / 2 / Count", "measure": "cnt", "path": ["east", 2], "total": false}, {"key": [["west", 2], "sum"], "label": "west / 2 / Sales", "measure": "sum", "path": ["west", 2], "total": false}, {"key": [["west", 2], "cnt"], "label": "west / 2 / Count", "measure": "cnt", "path": ["west", 2], "total": false}, {"key": [["TOTAL"], "sum"], "label": "Total / Sales", "measure": "sum", "path": [], "total": true}, {"key": [["TOTAL"], "cnt"], "label": "Total / Count", "measure": "cnt", "path": [], "total": true}]	Failed

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