Struct OperationMetadata 

pub struct OperationMetadata {
    pub name: &'static str,
    pub cse_key: Option<Box<str>>,
    pub cost: Cost,
    pub estimated_output_bytes: usize,
    pub uses_spatial_index: bool,
}

Static information used by compilation, explanation and memory admission.

Fields

name: &'static str

Canonical operation name shown by explain.

cse_key: Option<Box<str>>

Stable semantic key. Equal keys and equal dependencies are CSE candidates.

cost: Cost

Dominant data-movement cost.

estimated_output_bytes: usize

Conservative bytes retained by the operation result.

uses_spatial_index: bool

Whether the operation needs a reusable spatial index.

Implementations

impl OperationMetadata

pub const fn new(name: &'static str, cost: Cost) -> Self

Metadata for an operation without a semantic CSE key.

pub fn with_cse_key(self, key: impl Into<Box<str>>) -> Self

Adds a stable key used for common-subexpression elimination.

pub const fn with_estimated_output_bytes(self, bytes: usize) -> Self

Adds a conservative retained-size estimate.

pub const fn with_spatial_index(self) -> Self

Marks an operation as a spatial-index consumer.

Trait Implementations

impl Clone for OperationMetadata

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 OperationMetadata

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

Formats the value using the given formatter.

impl Eq for OperationMetadata

impl PartialEq for OperationMetadata

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for OperationMetadata