Struct ProjectOperator 

pub struct ProjectOperator { /* private fields */ }

A project operator that selects and transforms columns.

Implementations

impl ProjectOperator

pub fn new( child: Box<dyn Operator>, projections: Vec<ProjectExpr>, output_types: Vec<LogicalType>, ) -> Self

Creates a new project operator.

pub fn with_store( child: Box<dyn Operator>, projections: Vec<ProjectExpr>, output_types: Vec<LogicalType>, store: Arc<LpgStore>, ) -> Self

Creates a new project operator with store access for property lookups.

pub fn select_columns( child: Box<dyn Operator>, columns: Vec<usize>, types: Vec<LogicalType>, ) -> Self

Creates a project operator that selects specific columns.

Trait Implementations

impl Operator for ProjectOperator

fn next(&mut self) -> OperatorResult

Returns the next chunk of data, or None if exhausted.

fn reset(&mut self)

Resets the operator to its initial state.

fn name(&self) -> &'static str

Returns the name of this operator for debugging.