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CostWeights

oxirs_vec::optimizer::cost_model

Struct CostWeights 

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pub struct CostWeights { /* private fields */ }
Expand description

Online-learnable weights applied to each per-index formula output.

weight = 1.0 means “trust the formula”; higher values indicate the formula systematically underestimates real latency for that family; lower values indicate it overestimates. Weights are updated by crate::optimizer::query_stats::QueryStats::recommended_weights.

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impl CostWeights

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pub fn get(&self, family: IndexFamily) -> f64

Get weight for a family (defaults to 1.0 if not yet set).

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pub fn set(&mut self, family: IndexFamily, weight: f64)

Set weight for a family. Values are clamped to [0.05, 20.0] to prevent runaway feedback loops from outlier observations.

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impl Clone for CostWeights

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fn clone(&self) -> CostWeights

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for CostWeights

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

Formats the value using the given formatter. Read more
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impl Default for CostWeights

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for CostWeights

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl PartialEq for CostWeights

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

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

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

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

Serialize this value into the given Serde serializer. Read more
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impl StructuralPartialEq for CostWeights

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