Struct NodeCost 

pub struct NodeCost {
    pub op: &'static str,
    pub estimate: CostEstimate,
    pub children: Vec<NodeCost>,
}

An annotated plan cost tree mirroring the LogicalPlan structure.

Each node stores the operator name, its estimated cost, and the cost trees for its children. Built by CostModel::explain_costs and consumed by the verbose / JSON explain formatters.

Fields

op: &'static str

Short operator name (e.g. "Scan", "Join", "Filter").

estimate: CostEstimate

The cost estimate for this node.

children: Vec<NodeCost>

Cost trees for child nodes, in the same order as the plan children.

Trait Implementations

impl Clone for NodeCost

fn clone(&self) -> NodeCost

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NodeCost

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

Formats the value using the given formatter.