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ExpressionPrecomputationOptimizer

linkrs_query::optimizer::cost_based::expression_precomputation

Struct ExpressionPrecomputationOptimizer 

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pub struct ExpressionPrecomputationOptimizer { /* private fields */ }
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Expression Precomputation Optimizer

Determines which expressions should be precomputed to avoid redundant computations.

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impl ExpressionPrecomputationOptimizer

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

Create a new expression precomputation optimizer

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pub fn with_threshold(self, threshold: f64) -> Self

Set the precomputation threshold

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pub fn with_min_cost(self, min_cost: f64) -> Self

Set minimum expression cost

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pub fn with_overhead(self, overhead: f64) -> Self

Set precomputation overhead

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pub fn should_precompute( &self, expression: &ContextualExpression, reference_count: usize, ) -> PrecomputationDecision

Determine if an expression should be precomputed

§Parameters
  • expression: The expression to evaluate
  • reference_count: Number of times the expression is referenced
§Returns

Precomputation decision

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pub fn analyze_expressions( &self, expressions: &HashMap<ContextualExpression, usize>, ) -> Vec<(ContextualExpression, PrecomputationDecision)>

Analyze multiple expressions and return precomputation candidates

§Parameters
  • expressions: Map of expression to reference count
§Returns

List of expressions that should be precomputed

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pub fn total_precomputation_benefit( &self, decisions: &[(ContextualExpression, PrecomputationDecision)], ) -> f64

Get total estimated benefit from precomputing a list of expressions

Trait Implementations§

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impl Clone for ExpressionPrecomputationOptimizer

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for ExpressionPrecomputationOptimizer

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

Formats the value using the given formatter. Read more

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