Struct PlanCacheKey 

pub struct PlanCacheKey {
    pub hash: u64,
    pub sql_normalized: String,
}

查询计划缓存键

由归一化 SQL 的 xxHash 64bit 哈希值 + 归一化 SQL 文本组成。 哈希值用于快速查找，SQL 文本用于二次校验（防哈希碰撞）。

Fields

hash: u64

xxHash 64bit 哈希值

sql_normalized: String

归一化 SQL 文本（用于碰撞校验）

Implementations

impl PlanCacheKey

pub fn from_sql(sql: &str) -> Self

从原始 SQL 生成缓存键

1. 归一化 SQL（忽略大小写/空白差异）
2. 计算归一化 SQL 的 xxHash 64bit 哈希

Trait Implementations

impl Clone for PlanCacheKey

fn clone(&self) -> PlanCacheKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PlanCacheKey

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

Formats the value using the given formatter.

impl Eq for PlanCacheKey

impl Hash for PlanCacheKey

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for PlanCacheKey

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.