Struct NestedLoopJoinOperator 

pub struct NestedLoopJoinOperator { /* private fields */ }

Nested Loop Join Operator.

For each row in the outer (left) input, scans all rows in the inner (right) input and emits matches based on the join condition.

Implementations

impl NestedLoopJoinOperator

pub fn new( left: Box<dyn Operator>, right: Box<dyn Operator>, join_type: JoinType, condition: Option<Expression>, ) -> Self

Create a new nested loop join operator.

Arguments

• left - Left (outer) input operator
• right - Right (inner) input operator
• join_type - Type of join (INNER, LEFT, RIGHT, FULL, CROSS)
• condition - Join condition (None for CROSS JOIN)

pub fn with_projection( self, columns: Vec<ColumnSource>, projected_schema: Vec<ColumnInfo>, ) -> Self

Set fused output projection.

Nested-loop still evaluates the join predicate against the full logical left/right rows. After that predicate boundary, projected output can be built directly, and unmatched OUTER rows can use sparse NULLs only for requested columns.

Trait Implementations

impl Operator for NestedLoopJoinOperator

fn open(&mut self) -> Result<()>

Initialize the operator.

fn next(&mut self) -> Result<Option<RowRef>>

Get the next row from this operator.

fn close(&mut self) -> Result<()>

Close the operator and release resources.

fn schema(&self) -> &[ColumnInfo]

Get the schema (column information) for this operator’s output.

fn estimated_rows(&self) -> Option<usize>

Get an estimate of the number of rows this operator will produce.

fn name(&self) -> &str

Get a descriptive name for this operator (for EXPLAIN).

fn ordering(&self) -> OrderingProperty

Physical ordering guaranteed by this operator’s output.