Struct datafusion::relations::projection::ProjectRelation

pub struct ProjectRelation { /* fields omitted */ }

Methods

impl ProjectRelation

pub fn new(     input: Box<SimpleRelation>,     expr: Vec<RuntimeExpr>,     schema: Rc<Schema> ) -> Self

Trait Implementations

impl SimpleRelation for ProjectRelation

Important traits for Box<R>

impl<R> Read for Box<R> where
    R: Read + ?Sized, impl<W> Write for Box<W> where
    W: Write + ?Sized, impl<I> Iterator for Box<I> where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

fn scan<'a>(&'a mut self) -> Box<Iterator<Item = Result<Rc<RecordBatch>>> + 'a>

scan all records in this relation

fn schema<'a>(&'a self) -> &'a Schema

get the schema for this relation