Trait VarProvider

pub trait VarProvider: Debug {
    // Required methods
    fn get_value(
        &self,
        var_names: Vec<String>,
    ) -> Result<ScalarValue, DataFusionError>;
    fn get_type(&self, var_names: &[String]) -> Option<DataType>;
}

A var provider for @variable and @@variable runtime values.

Required Methods

fn get_value( &self, var_names: Vec<String>, ) -> Result<ScalarValue, DataFusionError>

Get variable value

fn get_type(&self, var_names: &[String]) -> Option<DataType>

Return the type of the given variable

Implementations on Foreign Types

impl VarProvider for SystemVar

fn get_value( &self, var_names: Vec<String>, ) -> Result<ScalarValue, DataFusionError>

get system variable value

fn get_type(&self, _: &[String]) -> Option<DataType>

impl VarProvider for UserDefinedVar

fn get_value( &self, var_names: Vec<String>, ) -> Result<ScalarValue, DataFusionError>

Get user defined variable value

fn get_type(&self, var_names: &[String]) -> Option<DataType>

Implementors