datafusion_physical_expr::execution_props

Trait VarProvider

Source 
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>;
}
Expand description

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

Required Methods§

Source

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

Get variable value

Source

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

Return the type of the given variable

Implementors§