Enum MultiwayPlan 

pub enum MultiwayPlan {
    WcojWithPlan(KCliqueVariableOrder),
    PlannedHashRoute {
        reason: PlannedHashReason,
        planner_evidence: CostPredictionRecord,
    },
    FreeJoin,
}

Route chosen for a recognized multiway shape.

Variants

WcojWithPlan(KCliqueVariableOrder)

Execute the WCOJ path with the attached K-clique plan.

PlannedHashRoute

Execute the captured fallback as a planned hash route.

Fields

reason: PlannedHashReason

Why the recognized shape routes to hash.

planner_evidence: CostPredictionRecord

Cost evidence that made the route auditable.

FreeJoin

Generic Free Join route emitted ONLY by the general multiway promoter. Provenance contract: inputs are the fallback body’s Scan leaves in left-to-right traversal order, so output_columns (which carries the fallback projection, as on every MultiWayJoin) coincides positionally with the concatenated-inputs column space — the property the Free Join dispatcher’s head projection relies on. Dedicated-shape promoters reorder inputs canonically and must never use this variant; the dispatcher declines every other plan value.

Trait Implementations

impl Clone for MultiwayPlan

fn clone(&self) -> MultiwayPlan

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MultiwayPlan

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

Formats the value using the given formatter.

impl PartialEq for MultiwayPlan

fn eq(&self, other: &MultiwayPlan) -> 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 MultiwayPlan