Enum JoinPlanNode 

pub enum JoinPlanNode {
    Scan {
        relation: String,
        estimated_cost: u64,
    },
    HashJoin {
        left: Box<JoinPlanNode>,
        right: Box<JoinPlanNode>,
        conditions: Vec<JoinCondition>,
        estimated_cost: u64,
        estimated_rows: u64,
    },
    NestedLoopJoin {
        left: Box<JoinPlanNode>,
        right: Box<JoinPlanNode>,
        conditions: Vec<JoinCondition>,
        estimated_cost: u64,
        estimated_rows: u64,
    },
}

A node in a join plan tree.

Variants

Scan

Leaf: scan a single relation.

Fields

relation: String

estimated_cost: u64

HashJoin

Hash join (good for larger inner relations).

Fields

left: Box<JoinPlanNode>

right: Box<JoinPlanNode>

conditions: Vec<JoinCondition>

estimated_cost: u64

estimated_rows: u64

NestedLoopJoin

Nested-loop join (fallback / small inner).

Fields

left: Box<JoinPlanNode>

right: Box<JoinPlanNode>

conditions: Vec<JoinCondition>

estimated_cost: u64

estimated_rows: u64

Implementations

impl JoinPlanNode

pub fn cost(&self) -> u64

Total estimated cost of this sub-plan.

pub fn estimated_output_rows(&self) -> u64

Estimated number of output rows.

pub fn depth(&self) -> usize

Depth of the plan tree (leaf = 1).

pub fn relations_involved(&self) -> Vec<String>

Collect all relation names involved in this sub-plan.

Trait Implementations

impl Clone for JoinPlanNode

fn clone(&self) -> JoinPlanNode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for JoinPlanNode

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

Formats the value using the given formatter.