Struct DefaultQueryPlanner 

pub struct DefaultQueryPlanner { /* private fields */ }

Default implementation of QueryPlanner

Implementations

impl DefaultQueryPlanner

pub fn new() -> Self

Create a new query planner with default cost parameters

pub fn with_costs( base_scan_cost: f64, predicate_cost_multiplier: f64, sort_cost: f64, limit_cost: f64, ) -> Self

Create a query planner with custom cost parameters

Trait Implementations

impl Default for DefaultQueryPlanner

fn default() -> Self

Returns the “default value” for a type.

impl QueryPlanner for DefaultQueryPlanner

fn create_execution_plan<'life0, 'life1, 'async_trait>( &'life0 self, query: &'life1 InternalQuery, ) -> Pin<Box<dyn Future<Output = NirvResult<ExecutionPlan>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Create an execution plan for the given query

fn estimate_cost<'life0, 'life1, 'async_trait>( &'life0 self, query: &'life1 InternalQuery, ) -> Pin<Box<dyn Future<Output = NirvResult<f64>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Estimate the cost of executing a query

fn optimize_plan<'life0, 'async_trait>( &'life0 self, plan: ExecutionPlan, ) -> Pin<Box<dyn Future<Output = NirvResult<ExecutionPlan>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Optimize an execution plan