Struct QueryNode 

pub struct QueryNode {

    pub id: String,
    pub table: String,
    pub relationship_type: Option<RelationshipType>,
    pub relationship_metadata: Option<RelationshipMetadata>,
    pub parent_id: Option<String>,
    pub children: Vec<String>,
    pub depth: usize,
    pub estimated_rows: usize,
    pub parallel_safe: bool,
    pub foreign_key: Option<String>,
    pub constraints: Vec<String>,
    pub available_columns: Vec<String>,
    pub index_hints: Vec<String>,
}

Represents a node in the query execution plan

Fields

id: String

Unique identifier for this node

table: String

Table to query

relationship_type: Option<RelationshipType>

Type of relationship from parent

relationship_metadata: Option<RelationshipMetadata>

Full relationship metadata if available

parent_id: Option<String>

Parent node ID (None for root)

children: Vec<String>

Child node IDs

depth: usize

Depth in the relationship tree

estimated_rows: usize

Estimated row count (can be updated from metadata)

parallel_safe: bool

Whether this node can be executed in parallel with siblings

foreign_key: Option<String>

Foreign key used to join with parent

constraints: Vec<String>

Additional constraints for optimization

available_columns: Vec<String>

Column names available in this table (for better query construction)

index_hints: Vec<String>

Index hints for the optimizer

Implementations

impl QueryNode

pub fn new(id: String, table: String) -> Self

Create a new query node

pub fn root(id: String, table: String) -> Self

Create a root node (no parent)

pub fn child( id: String, table: String, parent_id: String, relationship_type: RelationshipType, foreign_key: String, ) -> Self

Create a child node with parent relationship

pub fn child_with_metadata( id: String, table: String, parent_id: String, metadata: RelationshipMetadata, ) -> Self

Create a child node with full relationship metadata

pub fn add_child(&mut self, child_id: String)

Add a child node ID

pub fn set_depth(&mut self, depth: usize)

Set the depth for this node

pub fn set_estimated_rows(&mut self, rows: usize)

Set row count estimate

pub fn set_parallel_safe(&mut self, safe: bool)

Set parallel safety

pub fn add_constraint(&mut self, constraint: String)

Add a constraint

pub fn is_root(&self) -> bool

Check if this node is a root node

pub fn is_leaf(&self) -> bool

Check if this node is a leaf node

pub fn set_metadata(&mut self, metadata: RelationshipMetadata)

Update metadata for this node

pub fn set_columns(&mut self, columns: Vec<String>)

Set column information for better query construction

pub fn add_index_hint(&mut self, index: String)

Add index hints for optimization

pub fn primary_key(&self) -> &str

Get the primary key column name (defaults to “id”)

pub fn get_foreign_key(&self) -> Option<&str>

Get the foreign key column name for relationships

pub fn is_collection(&self) -> bool

Check if this node represents a collection relationship

pub fn requires_pivot(&self) -> bool

Check if this node requires a pivot table

Trait Implementations

impl Clone for QueryNode

fn clone(&self) -> QueryNode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryNode

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

Formats the value using the given formatter.