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<Value>>) -> Result<Rc<Value>, ExecutionError>;
}

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<Value>>) -> Result<Rc<Value>, ExecutionError>

Implementors

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