Struct SingleRowNode 

pub struct SingleRowNode;

Trait Implementations

impl Clone for SingleRowNode

fn clone(&self) -> SingleRowNode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SingleRowNode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl ExecutionPlan for SingleRowNode

fn execute<'a>( &'a self, _ctx: &'a ExecutionContext<'a>, ) -> Result<Box<dyn Iterator<Item = Result<Record, Error>> + 'a>, Error>

fn estimate_cardinality(&self, _ctx: &ExecutionContext<'_>) -> usize

估算该操作的输出基数