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CostConfiguration

oxirs_core::query::cost_based_optimizer

Struct CostConfiguration 

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pub struct CostConfiguration {
    pub sequential_scan_cost: f64,
    pub index_access_cost: f64,
    pub cpu_tuple_cost: f64,
    pub hash_build_cost: f64,
    pub hash_probe_cost: f64,
    pub filter_selectivity: f64,
    pub parallel_threshold: f64,
}
Expand description

Cost configuration parameters

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§sequential_scan_cost: f64

Cost per sequential scan of one triple

§index_access_cost: f64

Cost per index access

§cpu_tuple_cost: f64

Cost per tuple processed by CPU

§hash_build_cost: f64

Cost to build hash table per tuple

§hash_probe_cost: f64

Cost to probe hash table per tuple

§filter_selectivity: f64

Default filter selectivity

§parallel_threshold: f64

Threshold for parallel execution

Trait Implementations§

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impl Clone for CostConfiguration

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fn clone(&self) -> CostConfiguration

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

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

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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 CostConfiguration

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fn default() -> Self

Returns the “default value” for a type. Read more

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