Struct CostEstimate 

pub struct CostEstimate {
    pub rows: f64,
    pub cpu_cost: f64,
    pub io_cost: f64,
    pub total_cost: f64,
}

The estimated cost breakdown for a LogicalPlan node.

Fields

rows: f64

Estimated number of output rows.

cpu_cost: f64

Relative CPU cost units.

io_cost: f64

Relative I/O cost units (page reads).

total_cost: f64

Weighted total: io_cost + cpu_weight * cpu_cost.

Implementations

impl CostEstimate

pub fn zero() -> Self

A zero-cost estimate (empty plan / leaf with no work).

pub fn combine(a: &Self, b: &Self) -> Self

Combine two estimates by summing all fields component-wise.

Used for set operations and parallel branches.

Trait Implementations

impl Clone for CostEstimate

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CostEstimate

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

Formats the value using the given formatter.

impl PartialEq for CostEstimate

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CostEstimate