Enum SqpCostModel 

pub enum SqpCostModel {
    SimpleRowCount,
    IOCost,
    MemoryCost,
    HybridCost,
}

Cost model used to estimate query execution cost.

Variants

SimpleRowCount

Cost is proportional to the estimated row count touched.

IOCost

Cost includes I/O page reads based on block counts.

MemoryCost

Cost based on working-set memory pressure.

HybridCost

Weighted combination of row-count, I/O, and memory.

Trait Implementations

impl Clone for SqpCostModel

fn clone(&self) -> SqpCostModel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SqpCostModel

impl Debug for SqpCostModel

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

Formats the value using the given formatter.

impl Default for SqpCostModel

fn default() -> SqpCostModel

Returns the “default value” for a type.

impl Eq for SqpCostModel

impl Hash for SqpCostModel

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 SqpCostModel

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for SqpCostModel