Function renamed_column_position 

pub fn renamed_column_position<'a>(
    relation: &str,
    columns: impl IntoIterator<Item = &'a str>,
    from: &str,
    to: &str,
    has_system_columns: bool,
) -> Result<usize, SQLError>

renameatt_internal: find the original live attribute before checking the destination. Views and standalone composite relations have no system attributes.