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JoinOrderOptimizer

linkrs_query::optimizer::cost_based::join_order

Struct JoinOrderOptimizer 

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pub struct JoinOrderOptimizer { /* private fields */ }
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Connection Order Optimizer

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impl JoinOrderOptimizer

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pub fn new(cost_calculator: Arc<CostCalculator>) -> Self

Create a new connection order optimizer.

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pub fn with_dp_threshold(self, threshold: usize) -> Self

Setting the DP threshold

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pub fn optimize_join_order( &self, tables: &[TableInfo], conditions: &[JoinCondition], ) -> JoinOrderResult

Optimize the order of the connections.

§Parameters

“tables”: The list of tables involved in the connection. “conditions”: A list of connection conditions.

§Return

Results of the optimization of the connection sequence

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pub fn cost_of_order( &self, tables: &[TableInfo], conditions: &[JoinCondition], order: &[String], ) -> Option<f64>

Price a given table order with the same left-deep accumulation the DP minimizes, so the reviewer can compare the current chain against the proposed optimum apples-to-apples.

Returns None when order is not a permutation of tables (unpriceable — the caller must keep the current shape).

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pub fn to_decision(&self, result: &JoinOrderResult) -> JoinOrderDecision

Generate a JoinOrderDecision

Trait Implementations§

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impl Debug for JoinOrderOptimizer

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

Formats the value using the given formatter. Read more

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