Method add_var_provider

datafusion/expr/src/execution_props.rs:124–136

Registers a variable provider, returning the existing provider, if any

(
        &mut self,
        var_type: VarType,
        provider: Arc<dyn VarProvider + Send + Sync>,
    )

    /// Registers a variable provider, returning the existing provider, if any
    pub fn add_var_provider(
        &mut self,
        var_type: VarType,
        provider: Arc<dyn VarProvider + Send + Sync>,
    ) -> Option<Arc<dyn VarProvider + Send + Sync>> {
        let mut var_providers = self.var_providers.take().unwrap_or_default();

        let old_provider = var_providers.insert(var_type, provider);

        self.var_providers = Some(var_providers);

        old_provider
    }

    /// Returns the provider for the `var_type`, if any
    #[expect(clippy::needless_pass_by_value)]