pub fn ts_rank_cd_weighted_normalized<w, x, y, n>(
    w: w,
    x: x,
    y: y,
    n: n
) -> ts_rank_cd_weighted_normalized<<w as AsExpression<Array<Float>>>::Expression, <x as AsExpression<TsVector>>::Expression, <y as AsExpression<TsQuery>>::Expression, <n as AsExpression<Integer>>::Expression>