Function _resolve_columns_of_interest

python/pyarrow/pandas_compat.py:555–566

(df, schema, columns)

def _resolve_columns_of_interest(df, schema, columns):
    if schema is not None and columns is not None:
        raise ValueError('Schema and columns arguments are mutually '
                         'exclusive, pass only one of them')
    elif schema is not None:
        columns = schema.names
    elif columns is not None:
        columns = [c for c in columns if c in df.columns]
    else:
        columns = df.columns

    return columns


def dataframe_to_types(df, preserve_index, columns=None):