Struct ExplainPlan 

pub struct ExplainPlan {
    pub node_type: String,
    pub parent_relationship: Option<String>,
    pub parallel_aware: bool,
    pub async_capable: bool,
    pub startup_cost: f64,
    pub total_cost: f64,
    pub plan_rows: u64,
    pub plan_width: u64,
    pub plans: Vec<ExplainPlan>,
}

Recursive struct which describes the plan of a query

Fields

node_type: String

The type of the plan node (e.g., “Seq Scan”, “Nested Loop”, “Hash Join”). Indicates the operation performed at this step in the query execution plan.

parent_relationship: Option<String>

The relationship of this node to its parent in the plan tree. Common values include:

• “Outer”: This node is the outer input to a join (e.g., Nested Loop).
• “Inner”: This node is the inner input to a join.
• “Subquery”: This node is part of a subquery.
• “InitPlan”, “SubPlan”, “Member”: Special plan node roles.

May be None for root nodes or when not applicable.

parallel_aware: bool

Indicates whether the plan node is aware of parallel query execution. If true, the node may participate in or benefit from parallelism.

async_capable: bool

Indicates whether the node supports asynchronous execution. Async-capable nodes can execute operations concurrently with others, improving performance in some plans (especially with I/O or remote sources).

startup_cost: f64

The estimated cost of starting this plan node. This typically includes one-time setup costs, like initializing data structures.

total_cost: f64

The estimated total cost of fully executing this plan node, including startup and all tuple processing.

plan_rows: u64

The estimated number of rows this plan node will output. This is a planner estimate, not an actual runtime value.

plan_width: u64

The estimated average width (in bytes) of each row produced by this node. Useful for understanding memory and I/O implications.

plans: Vec<ExplainPlan>

Child plan nodes that this node depends on or drives. For example, a join node will typically have two child plans (inner and outer).

Trait Implementations

impl Debug for ExplainPlan

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ExplainPlan

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ExplainPlan

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

where __S: Serializer,

Serialize this value into the given Serde serializer.