[
  {
    "numeric_col": 1.3,
    "text_col": "text",
    "list_col": [
      "v1", "v2"
    ],
   "map_column": {
    "field1": "value1",
    "field2": "value2",
    "nested_map": {
      "nested_field1": "nested_value1",
      "nested_field2" : "nested_value2"
      }
    }
  },{
    "numeric_col": 2.3,
    "text_col": "",
    "list_col": [],
    "map_column": {}
  },{
    "numeric_col": null,
    "text_col": null,
    "list_col": [],
    "map_column": {}
  },{
  "numeric_col": 1
  }
]