Struct OptimizationDecision 

pub struct OptimizationDecision {
    pub traversal_start: TraversalStartDecision,
    pub index_selection: IndexSelectionDecision,
    pub join_order: JoinOrderDecision,
    pub rewrite_rules: Vec<RewriteRuleId>,
    pub stats_version: u64,
    pub index_version: u64,
    pub created_at: Instant,
}

The complete optimization decision

Fields

traversal_start: TraversalStartDecision

Traverse the starting point and make a decision

index_selection: IndexSelectionDecision

Index selection decision

join_order: JoinOrderDecision

Decision on the order of connections

rewrite_rules: Vec<RewriteRuleId>

Sequence of applicable rewriting rules

stats_version: u64

Statistical information version for decision-making

index_version: u64

Index version used during decision-making

created_at: Instant

Decision Timestamp

Implementations

impl OptimizationDecision

pub fn new( traversal_start: TraversalStartDecision, index_selection: IndexSelectionDecision, join_order: JoinOrderDecision, stats_version: u64, index_version: u64, ) -> Self

Create new optimization decisions

pub fn is_valid( &self, current_stats_version: u64, current_index_version: u64, ) -> bool

Check whether the decision is still valid.

pub fn age_secs(&self) -> u64

Obtain the decision-making age (in seconds)

Trait Implementations

impl Clone for OptimizationDecision

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 OptimizationDecision

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

Formats the value using the given formatter.

impl PartialEq for OptimizationDecision

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for OptimizationDecision