Struct ProjectionMatch 

pub struct ProjectionMatch {
    pub projection_name: String,
    pub cost: u32,
}

Result of matching a query against a set of projections. Callers use the lowest-cost hit; ties broken by declaration order.

Fields

projection_name: String

cost: u32

Relative cost hint. Smaller = better. Currently encodes “extra group keys the query doesn’t need” as cost — so the narrowest-fit projection wins.

Trait Implementations

impl Clone for ProjectionMatch

fn clone(&self) -> ProjectionMatch

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProjectionMatch

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

Formats the value using the given formatter.

impl PartialEq for ProjectionMatch

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

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

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

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

impl StructuralPartialEq for ProjectionMatch