Struct QueryOptimizer 

pub struct QueryOptimizer {
    pub estimator: CardinalityEstimator,
    pub cost_model: CostModel,
    pub graph_stats: Option<GraphStats>,
    pub index_candidates: Vec<IndexScanCandidate>,
    pub table_name: Option<String>,
    pub row_count: Option<u64>,
    pub index_stats: IndexStats,
    pub config: OptimizerConfig,
}

Operator-tree query optimizer.

Fields

estimator: CardinalityEstimator

cost_model: CostModel

graph_stats: Option<GraphStats>

index_candidates: Vec<IndexScanCandidate>

table_name: Option<String>

row_count: Option<u64>

index_stats: IndexStats

config: OptimizerConfig

Implementations

impl QueryOptimizer

pub fn new() -> Self

pub fn with_index_candidates( self, candidates: impl IntoIterator<Item = IndexScanCandidate>, table: impl Into<String>, ) -> Self

Attach immutable scan candidates discovered from the caller’s catalog snapshot. The optimizer selects among these candidates without retaining a storage handle.

pub fn with_graph_stats(self, gs: GraphStats) -> Self

pub fn with_graph_store(self, store: Arc<dyn GraphStoreSampler>) -> Self

pub fn with_row_count(self, n: u64) -> Self

pub fn with_index_stats(self, stats: IndexStats) -> Self

pub fn with_column_stats(self, stats: BTreeMap<String, ColumnStats>) -> Self

pub fn optimize(&self, op: OperatorTree) -> OperatorTree

Optimize a query through the complete rewrite pipeline.

Trait Implementations

impl Default for QueryOptimizer

fn default() -> Self

Returns the “default value” for a type.