CostEstimator

kotoba_query_engine::optimizer

Struct CostEstimator 

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pub struct CostEstimator<T: KeyValueStore> { /* private fields */ }
Expand description

Cost estimation for query optimization

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impl<T: KeyValueStore + 'static> CostEstimator<T>

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pub fn new(storage: Arc<T>) -> Self

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pub async fn estimate_cost(&self, _plan: &ExecutionPlan) -> Result<QueryCost>

Estimate the cost of executing a query plan

Auto Trait Implementations§

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impl<T> Freeze for CostEstimator<T>

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impl<T> RefUnwindSafe for CostEstimator<T>
where T: RefUnwindSafe,

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impl<T> Send for CostEstimator<T>

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impl<T> Sync for CostEstimator<T>

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impl<T> Unpin for CostEstimator<T>

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impl<T> UnwindSafe for CostEstimator<T>
where T: RefUnwindSafe,

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

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fn type_id(&self) -> TypeId

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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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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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, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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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.