Struct QueryFingerprint 

pub struct QueryFingerprint {
    pub table_name: String,
    pub columns: Vec<String>,
    pub predicate_structure_hash: u64,
}

Fingerprint for a cacheable query pattern

Fields

table_name: String

Table name (lowercase)

columns: Vec<String>

Selected columns (sorted for comparison)

predicate_structure_hash: u64

Hash of the predicate structure (not values)

Implementations

impl QueryFingerprint

pub fn new(table_name: &str, columns: Vec<String>) -> Self

Create a fingerprint for a simple table scan

pub fn with_predicate( table_name: &str, columns: Vec<String>, predicate: &Expression, ) -> Self

Create a fingerprint with predicate structure

Trait Implementations

impl Clone for QueryFingerprint

fn clone(&self) -> QueryFingerprint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryFingerprint

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

Formats the value using the given formatter.

impl Eq for QueryFingerprint

impl Hash for QueryFingerprint

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 QueryFingerprint

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for QueryFingerprint