def get_updated_impressions(impressions: List[str], impressions_visible: List[str]) -> List[str]:
    """Returns an array of updated impressions based on logs of visible impressions."""
    if isinstance(impressions_visible, list) and len(impressions) >= len(impressions_visible):
        return impressions_visible
    return impressions


# Unit test: Row level (added)
@pytest.mark.parametrize('impressions,impressions_visible,updated_impressions',
                         [(['i1', 'i2', 'i3', 'i4'], ['i1', 'i2', 'i3'], ['i1', 'i2', 'i3']),
                          (['i1', 'i2'], ['i1', 'i2', 'i3'], ['i1', 'i2']),
                          (['i1', 'i2', 'i3', 'i4'], None, ['i1', 'i2', 'i3', 'i4'])])
def test_get_updated_impressions(impressions, impressions_visible, updated_impressions):
    assert get_updated_impressions(impressions, impressions_visible) == updated_impressions