Struct JoinCost

Source

pub struct JoinCost {
    pub cardinality: usize,
    pub operations: u64,
}

Expand description

Represents the cost of joining a set of tables

Fields§

§cardinality: usize

Estimated number of intermediate rows

§operations: u64

Estimated comparison operations

Implementations§

Source §

impl JoinCost

Source

pub fn new(cardinality: usize, operations: u64) -> Self

Source

pub fn total(&self) -> u64

Estimate total cost as a comparable value Prioritizes reducing intermediate row count (cardinality) then comparison operations

Trait Implementations§

Source §

impl Clone for JoinCost

Source §

fn clone(&self) -> JoinCost

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

Source §

impl Debug for JoinCost

Source §

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Source §

impl PartialEq for JoinCost

Source §

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

Tests for self and other values to be equal, and is used by ==.

1.0.0 · Source§

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

Source §

impl Copy for JoinCost

Source §

impl StructuralPartialEq for JoinCost

Auto Trait Implementations§

§

impl UnwindSafe for JoinCost

Blanket Implementations§

Source §

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

Source §

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

Source §

impl<T> AnyEq for T
where T: Any + PartialEq,

Source §

fn equals(&self, other: &(dyn Any + 'static)) -> bool

Source §

fn as_any(&self) -> &(dyn Any + 'static)

Source §

impl<T> Borrow<T> for T
where T: ?Sized,

Source §

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

Source §

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source §

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

Mutably borrows from an owned value. Read more

Source §

impl<T> CloneToUninit for T
where T: Clone,

Source §

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

Source §

impl<T> From<T> for T

Source §

fn from(t: T) -> T

Returns the argument unchanged.

Source §

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

Source §

fn into(self) -> U

Calls U::from(self).

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

Source §

impl<T> IntoEither for T

Source §

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

Source §

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

Source §