{
  "language": "sql",
  "formula": "SELECT date_add(DATE '2026-01-01', CAST(Period AS INTEGER) * INTERVAL '1 day') AS result FROM input ORDER BY Period",
  "dataset": [
    {
      "Region": "North",
      "Amount": 10,
      "Label": "North-one",
      "Period": 1
    },
    {
      "Region": "North",
      "Amount": 20,
      "Label": "North-two",
      "Period": 2
    },
    {
      "Region": "South",
      "Amount": null,
      "Label": "South-one",
      "Period": 3
    },
    {
      "Region": "South",
      "Amount": 5,
      "Label": "South-two",
      "Period": 4
    }
  ],
  "types": {
    "Region": "string",
    "Amount": "float",
    "Label": "string",
    "Period": "integer"
  },
  "expected_rows": [
    [
      "2026-01-02 00:00:00"
    ],
    [
      "2026-01-03 00:00:00"
    ],
    [
      "2026-01-04 00:00:00"
    ],
    [
      "2026-01-05 00:00:00"
    ]
  ],
  "checked_on": "2026-10-27",
  "proof_scope": "xmetric browser engine on the stated sample and an independent own-CSV fixture; not native vendor or corpus parity"
}