parquet-avro/src/test/resources/list_with_nulls.avsc

{
  "type": "record",
  "name": "NullLists",
  "namespace": "com.test",
  "fields": [
    {
      "name": "KeyID",
      "type": "string"
    },
    {
      "name": "NullableList",
      "type": [
        "null",
        {
          "type": "array",
          "items": [
            "null",
            "string"
          ]
        }
      ],
      "default": null
    }
  ]
}