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


def update_impression_col(df: pd.DataFrame) -> pd.DataFrame:
    """Returns a table of logs where impressions is updated to consider visible impressions."""
    _df = df.copy()
    _df['impressions'] = _df.apply(lambda x: get_updated_impressions(x['impressions'],
                                                                     x['impressions_visible']), axis=1)
    _df = _df.drop(columns=['impressions_visible'])
    return _df