Get a wrapped, registered column.

    This function cannot return columns that are part of wrapped
    DataFrames, it's only for columns registered directly through Orca.

    Parameters
    ----------
    table_name : str
    column_name : str

    Returns
    -------
    wrapped : _SeriesWrapper or _ColumnFuncWrapper

def get_raw_column(table_name, column_name):
    """
    Get a wrapped, registered column.

    This function cannot return columns that are part of wrapped
    DataFrames, it's only for columns registered directly through Orca.

    Parameters
    ----------
    table_name : str
    column_name : str

    Returns
    -------
    wrapped : _SeriesWrapper or _ColumnFuncWrapper

    """
    try:
        return _COLUMNS[(table_name, column_name)]
    except KeyError:
        raise KeyError('column {!r} not found for table {!r}'.format(
            column_name, table_name))