Trait datafusion::api::ScalarFunction

pub trait ScalarFunction {
    fn name(&self) -> String;
    fn args(&self) -> Vec<Field>;
    fn return_type(&self) -> DataType;
    fn execute(
        &self, 
        args: Vec<Rc<ColumnData>>
    ) -> Result<Rc<ColumnData>, Box<String>>;
}

Scalar function. User-defined implementations will be dynamically loaded at runtime.

Required Methods

fn name(&self) -> String

fn args(&self) -> Vec<Field>

fn return_type(&self) -> DataType

fn execute(
    &self,
    args: Vec<Rc<ColumnData>>
) -> Result<Rc<ColumnData>, Box<String>>

Implementors

• impl ScalarFunction for SqrtFunction
• impl ScalarFunction for STPointFunc
• impl ScalarFunction for STAsText