      "constraints": {"enum": ["a", "b", "c"]},
    ...         "ordered": True,
    ...     }
    ... )
    CategoricalDtype(categories=['a', 'b', 'c'], ordered=True, categories_dtype=object)

    >>> convert_json_field_to_pandas_type({"name": "a_datetime", "type": "datetime"})
    'datetime64[ns]'

    >>> convert_json_field_to_pandas_type(
    ...     {"name": "a_datetime_with_tz", "type": "datetime", "tz": "US/Central"}
    ... )
    'datetime64[ns, US/Central]'
    r=