fixtures/add_nullable_string_column/scenario.json

{
  "schema_version": "1.0",
  "scenario_id": "add_nullable_string_column",
  "title": "Add nullable string column",
  "category": "additive",
  "description": "A nullable string column is appended. Every existing column, value and row is unchanged. The new column holds both nulls and empty strings, which are different values.",
  "notes": [],
  "tags": [
    "add-field",
    "string",
    "nullable"
  ],
  "row_identity": [
    "id"
  ],
  "versions": [
    {
      "id": "v0",
      "file": "v0.parquet",
      "row_count": 6,
      "fingerprint": "sha256:ffbd13144dd0c4b932b54b17badd51ef9e9209a5e577a165cab231d0fed9b6d2",
      "schema": [
        {
          "name": "id",
          "type": "int64",
          "nullable": false
        },
        {
          "name": "name",
          "type": "string",
          "nullable": true
        }
      ],
      "writer": {
        "use_dictionary": true
      },
      "dictionaries": []
    },
    {
      "id": "v1",
      "file": "v1.parquet",
      "row_count": 6,
      "fingerprint": "sha256:3d0adf61168f53d1f9fcfbc45c5b056f18a1acdbfd57826e5dd6d970568ca47c",
      "schema": [
        {
          "name": "id",
          "type": "int64",
          "nullable": false
        },
        {
          "name": "name",
          "type": "string",
          "nullable": true
        },
        {
          "name": "customer_segment",
          "type": "string",
          "nullable": true
        }
      ],
      "writer": {
        "use_dictionary": true
      },
      "dictionaries": []
    }
  ],
  "transitions": [
    {
      "from": "v0",
      "to": "v1",
      "mutations": [
        {
          "kind": "add_field",
          "path": "customer_segment",
          "type": "string",
          "nullable": true
        }
      ],
      "invariants": {
        "row_count_preserved": true,
        "row_identity_preserved": true,
        "rows_retained": true,
        "paths_retained": true,
        "common_values_preserved": true,
        "value_changes": [],
        "parquet_schema_preserved": false
      }
    }
  ]
}