Struct ProjectNode 

pub struct ProjectNode { /* private fields */ }

Project operator: evaluates expressions to produce a new row shape.

Project(exprs=[a, b+1 AS c])
  └── input

Implementations

impl ProjectNode

pub fn new(input: Box<dyn PlanNode>, exprs: Vec<ProjectExpr>) -> Self

pub fn columns(input: Box<dyn PlanNode>, columns: Vec<String>) -> Self

Create a simple column-selection projection (no expressions).

Trait Implementations

impl PlanNode for ProjectNode

fn schema(&self) -> &Schema

Schema of rows produced by this node.

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

Return the next row, or None when exhausted.

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

Reset the operator for re-execution (e.g., inner side of nested loop join).

fn collect_all(&mut self) -> Result<Vec<Row>>

Collect all remaining rows (convenience method).