Struct IndexScanCandidate

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pub struct IndexScanCandidate {
    pub index_name: String,
    pub table_name: String,
    pub field: String,
    pub predicate: Predicate,
    pub scan_cost: f64,
}

Expand description

Query-local physical index candidate supplied by an engine catalog.

The candidate already contains the scan cost for this predicate. This keeps the planner independent of an engine’s index implementation while allowing the final optimizer pass to emit a concrete OperatorTree::IndexScan.

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§index_name: String§table_name: String§field: String§predicate: Predicate§scan_cost: f64

Trait Implementations§

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impl Clone for IndexScanCandidate

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fn clone(&self) -> IndexScanCandidate

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 IndexScanCandidate

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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 PartialEq for IndexScanCandidate

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

Equality operator ==. Read more

1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more

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impl StructuralPartialEq for IndexScanCandidate

Auto Trait Implementations§

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impl UnwindSafe for IndexScanCandidate

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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> ErasedDestructor for T
where T: 'static,

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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 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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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