Struct IndexStatistics 

pub struct IndexStatistics {
    pub name: String,
    pub columns: Vec<String>,
    pub index_type: IndexType,
    pub size: usize,
    pub height: Option<usize>,
}

Index statistics.

Fields

name: String

Index name.

columns: Vec<String>

Indexed columns.

index_type: IndexType

Index type (btree, rtree, hash).

size: usize

Index size in bytes.

height: Option<usize>

Height of index tree (for tree indexes).

Implementations

impl IndexStatistics

pub fn new( name: String, columns: Vec<String>, index_type: IndexType, size: usize, ) -> Self

Create new index statistics.

pub fn lookup_cost(&self) -> Cost

Cost of index lookup.

pub fn scan_cost(&self, selectivity: f64) -> Cost

Cost of index scan.

Trait Implementations

impl Clone for IndexStatistics

fn clone(&self) -> IndexStatistics

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for IndexStatistics

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for IndexStatistics

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for IndexStatistics

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.