Struct LogicalOptionalExtend 

pub struct LogicalOptionalExtend {
    pub children: Vec<LogicalOperator>,
    pub rel_table_name: String,
    pub rel_table_id: u64,
    pub rel_var: String,
    pub src_node_var: String,
    pub dst_node_var: String,
    pub direction: EdgeDirection,
    pub cardinality: u64,
}

OPTIONAL MATCH over an already-bound pair of node variables.

Used when both endpoint node variables of the optional pattern are bound by the required side (e.g. OPTIONAL MATCH (a)-[existing:Connected]-(b) where a and b are already in scope). Unlike LogicalOptionalMatch, the right side is not a scan: the pattern is probed per input row against the relationship table adjacency (forward and/or reverse), emitting the edge property columns, or NULL-padding them when no edge exists (P53.25).

Fields

children: Vec<LogicalOperator>

rel_table_name: String

Name of the relationship table to probe.

rel_table_id: u64

ID of the relationship table.

rel_var: String

Variable name of the relationship (e.g., “existing”); prefix for the emitted edge property columns.

src_node_var: String

Variable name of the bound source node (e.g., “a”).

dst_node_var: String

Variable name of the bound destination node (e.g., “b”). An empty string selects fan-out mode (P53.40): the destination is anonymous (OPTIONAL MATCH (m)-[r:R]-(:T)), so every edge incident on the source becomes one output row.

direction: EdgeDirection

Direction of the probe (forward, backward, or both).

cardinality: u64

Estimated cardinality.

Trait Implementations

impl Clone for LogicalOptionalExtend

fn clone(&self) -> LogicalOptionalExtend

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LogicalOptionalExtend

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

Formats the value using the given formatter.