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IndexStatistics

grafeo_core::statistics

Struct IndexStatistics 

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pub struct IndexStatistics {
    pub spo_lookup_cost: f64,
    pub pos_lookup_cost: f64,
    pub osp_lookup_cost: f64,
    pub has_osp_index: bool,
}
Expand description

Statistics about index access patterns for cost estimation.

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§spo_lookup_cost: f64

Average cost of SPO index lookup (subject first).

§pos_lookup_cost: f64

Average cost of POS index lookup (predicate first).

§osp_lookup_cost: f64

Average cost of OSP index lookup (object first).

§has_osp_index: bool

Whether OSP index is available.

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impl IndexStatistics

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pub fn new() -> Self

Creates default index statistics.

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pub fn estimate_pattern_cost( &self, subject_bound: bool, predicate_bound: bool, object_bound: bool, ) -> f64

Estimates the cost of executing a triple pattern.

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impl Clone for IndexStatistics

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fn clone(&self) -> IndexStatistics

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 IndexStatistics

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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 IndexStatistics

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fn default() -> IndexStatistics

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

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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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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impl<T> From<T> for T

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fn from(t: T) -> T

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Pointable for T

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const ALIGN: usize

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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

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fn clone_into(&self, target: &mut T)

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impl<T, U> TryFrom<U> for T
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type Error = Infallible

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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.