Struct EmptyOperator 

pub struct EmptyOperator { /* private fields */ }

An empty operator that produces no rows.

Useful as a placeholder or for empty result sets.

Implementations

impl EmptyOperator

pub fn new() -> Self

Create an empty operator with no schema.

Trait Implementations

impl Default for EmptyOperator

fn default() -> Self

Returns the “default value” for a type.

impl Operator for EmptyOperator

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 name(&self) -> &str

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

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

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

fn ordering(&self) -> OrderingProperty

Physical ordering guaranteed by this operator’s output.