Trait datafusion::dataframe::DataFrame

pub trait DataFrame {
    fn select(&self, expr: Vec<Expr>) -> Result<Rc<DataFrame>>;
    fn filter(&self, expr: Expr) -> Result<Rc<DataFrame>>;
    fn col(&self, column_name: &str) -> Result<Expr>;
    fn schema(&self) -> &Rc<Schema>;
    fn plan(&self) -> &Rc<LogicalPlan>;
    fn show(&self, count: usize);
}

DataFrame is an abstraction of a logical plan and a schema

Required Methods

fn select(&self, expr: Vec<Expr>) -> Result<Rc<DataFrame>>

Projection

fn filter(&self, expr: Expr) -> Result<Rc<DataFrame>>

Selection

fn col(&self, column_name: &str) -> Result<Expr>

Return an expression representing the specified column

fn schema(&self) -> &Rc<Schema>

fn plan(&self) -> &Rc<LogicalPlan>

fn show(&self, count: usize)

show N rows (useful for debugging)

Implementors

• impl DataFrame for DF