Method reset_variable

datafusion/core/src/execution/context/mod.rs:1150–1176

(&self, stmt: ResetVariable)

    }

    async fn reset_variable(&self, stmt: ResetVariable) -> Result<()> {
        let variable = stmt.variable;
        if variable.starts_with("datafusion.runtime.") {
            return self.reset_runtime_variable(&variable);
        }

        let mut state = self.state.write();
        state.config_mut().options_mut().reset(&variable)?;

        // Refresh UDFs to ensure configuration-dependent behavior updates
        let config_options = state.config().options();
        let udfs_to_update: Vec<_> = state
            .scalar_functions()
            .values()
            .filter_map(|udf| {
                udf.inner()
                    .with_updated_config(config_options)
                    .map(Arc::new)
            })
            .collect();

        for udf in udfs_to_update {
            state.register_udf(udf)?;
        }

        Ok(())
    }

    fn set_runtime_variable(&self, variable: &str, value: &str) -> Result<()> {
        let key = variable.strip_prefix("datafusion.runtime.").unwrap();