Struct QueryPlan 

pub struct QueryPlan {
    pub root: PlanNode,
    pub estimated_cost_ms: f64,
    pub index_used: Option<IndexType>,
    pub filter_strategy: FilterStrategy,
    pub cache_hit: Option<bool>,
    pub plan_reuse_count: Option<u64>,
}

Query execution plan generated by EXPLAIN.

Fields

root: PlanNode

Root node of the plan tree.

estimated_cost_ms: f64

Estimated execution cost in milliseconds.

index_used: Option<IndexType>

Index type used (if any).

filter_strategy: FilterStrategy

Filter strategy.

cache_hit: Option<bool>

Whether this plan was served from the compiled plan cache (CACHE-02).

plan_reuse_count: Option<u64>

How many times this cached plan has been reused (CACHE-02).

The value is the reuse_count atomically incremented inside the cache on every successful get(). A value of 1 means the plan was found in cache and this is its first reuse. The count includes the current call to explain_query.

Implementations

impl QueryPlan

pub fn to_tree(&self) -> String

Renders the plan as a tree string.

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

Renders the plan as JSON.

Errors

Returns an error if serialization fails.

impl QueryPlan

pub fn from_select(stmt: &SelectStatement) -> Self

Creates a new query plan from a SELECT statement.

pub fn from_select_with_indexed_fields( stmt: &SelectStatement, indexed_fields: &HashSet<String>, ) -> Self

Creates a new query plan from SELECT with known indexed metadata fields.

pub fn from_match(match_clause: &MatchClause, stats: &CollectionStats) -> Self

Creates a new query plan from a MATCH clause (EPIC-046 US-004).

Trait Implementations

impl Clone for QueryPlan

fn clone(&self) -> QueryPlan

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 Display for QueryPlan

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

Formats the value using the given formatter.

impl PartialEq for QueryPlan

fn eq(&self, other: &QueryPlan) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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.

impl StructuralPartialEq for QueryPlan