Hash scalar value

    Returns
    -------
    1d uint64 numpy array of hash value, of length 1

def _hash_scalar(val, encoding='utf8', hash_key=None):
    """
    Hash scalar value

    Returns
    -------
    1d uint64 numpy array of hash value, of length 1
    """

    if isna(val):
        # this is to be consistent with the _hash_categorical implementation
        return np.array([np.iinfo(np.uint64).max], dtype='u8')

    if getattr(val, 'tzinfo', None) is not None:
        # for tz-aware datetimes, we need the underlying naive UTC value and
        # not the tz aware object or pd extension type (as
        # infer_dtype_from_scalar would do)
        if not isinstance(val, tslibs.Timestamp):
            val = tslibs.Timestamp(val)
        val = val.tz_convert(None)

    dtype, val = infer_dtype_from_scalar(val)
    vals = np.array([val], dtype=dtype)

    return hash_array(vals, hash_key=hash_key, encoding=encoding,
                      categorize=False)