Struct ProjectNode 

pub struct ProjectNode {
    pub input: Box<PhysicalPlan>,
    pub projections: Vec<(Expression, String)>,
}

Fields

input: Box<PhysicalPlan>

projections: Vec<(Expression, String)>

Trait Implementations

impl Clone for ProjectNode

fn clone(&self) -> ProjectNode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProjectNode

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

Formats the value using the given formatter.

impl ExecutionPlan for ProjectNode

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