Nested Tuple

Full example here

    {
  "name": "attributes",
  "schemaType": "optionalGroup",
  "logicalType": "INT32",
  "fields": [
    {
      "name": "key_value",
      "schemaType": "requiredGroup",
      "fields": [
        {
          "name": "key",
          "schemaType": "required",
          "physicalType": "BINARY",
          "logicalType": "STRING"
        },
        {
          "name": "value",
          "schemaType": "optional",
          "physicalType": "BINARY",
          "logicalType": "STRING"
        }
      ]
    }
  ],
  "data": [{"key_value": [{"key": "tqwqmcqvqo", "value": "gkqcl"}]}]
}