Struct QueryPlan 

pub struct QueryPlan {
    pub pattern: QueryPattern,
    pub index: IndexType,
    pub estimated_results: usize,
    pub estimated_io_cost: f64,
    pub estimated_cpu_cost: f64,
    pub total_cost: f64,
    pub confidence: f64,
    pub explanation: String,
}

Query execution plan with cost estimates

Fields

pattern: QueryPattern

Pattern being queried

index: IndexType

Index to use for execution

estimated_results: usize

Estimated number of results

estimated_io_cost: f64

Estimated I/O cost (page reads)

estimated_cpu_cost: f64

Estimated CPU cost (comparisons)

total_cost: f64

Total estimated cost

confidence: f64

Confidence in cost estimate (0.0 - 1.0)

explanation: String

Explanation of plan choice

Implementations

impl QueryPlan

pub fn new( pattern: QueryPattern, index: IndexType, estimated_results: usize, ) -> Self

Create a new query plan

pub fn with_explanation(self, explanation: String) -> Self

Update with explanation

pub fn with_confidence(self, confidence: f64) -> Self

Update confidence level

pub fn to_ascii_tree(&self) -> String

Generate ASCII tree visualization of the query plan

pub fn to_dot(&self) -> String

Generate DOT format for Graphviz visualization

pub fn to_json(&self) -> Result<String>

Generate JSON representation of the query plan

pub fn to_summary(&self) -> String

Generate compact summary of the query plan

Trait Implementations

impl Clone for QueryPlan

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 QueryPlan

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for QueryPlan

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for QueryPlan

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.