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.

Panics

Panics if projections and output_types have different lengths.

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

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

Panics

Panics if projections and output_types have different lengths.

pub fn with_transaction_context( self, epoch: EpochId, transaction_id: Option<TransactionId>, ) -> Self

Sets the transaction context for MVCC-aware property lookups.

pub fn with_session_context(self, context: SessionContext) -> Self

Sets the session context for introspection functions.

pub fn into_parts( self, ) -> (Box<dyn Operator>, Vec<ProjectExpr>, Vec<LogicalType>)

Decomposes this operator into its child and projections for push-based conversion.

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

Pulls the next batch of data. Returns None when exhausted.

fn reset(&mut self)

Resets to initial state so you can iterate again.

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

Returns a name for debugging/explain output.

fn into_any(self: Box<Self>) -> Box<dyn Any + Send>

Converts this boxed operator into Box<dyn Any> for type-based dispatch.