CostEstimate

kotoba_execution::planner::optimizer

Struct CostEstimate 

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pub struct CostEstimate {
    pub cardinality: f64,
    pub cost: f64,
    pub selectivity: f64,
}
Expand description

コスト推定情報

Fields§

§cardinality: f64

推定行数

§cost: f64

推定コスト（処理時間）

§selectivity: f64

選択性（0.0-1.0）

Trait Implementations§

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impl Clone for CostEstimate

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fn clone(&self) -> CostEstimate

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

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

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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<T> Any for T
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impl<T> CloneToUninit for T
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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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fn __clone_box(&self, _: Private) -> *mut ()

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type Output = T

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type Error = <U as TryFrom<T>>::Error

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