Struct PrefetchPlan 

pub struct PrefetchPlan {
    pub shard_badges: HashMap<u64, Vec<u64>>,
    pub n_badges: usize,
}

预取计划：按分片分组的 badge 块列表（每 shard 内部升序，供顺序预读/合并）。

Fields

shard_badges: HashMap<u64, Vec<u64>>

shard_id -> 去重升序的 badge 块号

n_badges: usize

Implementations

impl PrefetchPlan

pub fn build(keys: &[u64], layout: &Layout) -> Self

pub fn badges(&self, shard: u64) -> &[u64]

pub fn entry(&mut self, shard: u64, badge: u64)

追加一个（shard, badge）到计划（流水线增量累积；重复由 settle 处理）。

pub fn settle(&mut self)

结算：shard 内排序 + 去重 + 重算 n_badges（计划被消费前调用）。

Trait Implementations

impl Clone for PrefetchPlan

fn clone(&self) -> PrefetchPlan

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PrefetchPlan

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PrefetchPlan

fn default() -> PrefetchPlan

Returns the “default value” for a type.