Method set_runtime_variable

datafusion/core/src/execution/context/mod.rs:1178–1219

(&self, variable: &str, value: &str)

    }

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

        let mut state = self.state.write();

        let mut builder = RuntimeEnvBuilder::from_runtime_env(state.runtime_env());
        builder = match key {
            "memory_limit" => {
                let memory_limit = Self::parse_capacity_limit(variable, value)?;
                builder.with_memory_limit(memory_limit, 1.0)
            }
            "max_temp_directory_size" => {
                let directory_size = Self::parse_capacity_limit(variable, value)?;
                builder.with_max_temp_directory_size(directory_size as u64)
            }
            "temp_directory" => builder.with_temp_file_path(value),
            "metadata_cache_limit" => {
                let limit = Self::parse_capacity_limit(variable, value)?;
                builder.with_metadata_cache_limit(limit)
            }
            "list_files_cache_limit" => {
                let limit = Self::parse_capacity_limit(variable, value)?;
                builder.with_object_list_cache_limit(limit)
            }
            "list_files_cache_ttl" => {
                let duration = Self::parse_duration(variable, value)?;
                builder.with_object_list_cache_ttl(Some(duration))
            }
            "file_statistics_cache_limit" => {
                let limit = Self::parse_capacity_limit(variable, value)?;
                builder.with_file_statistics_cache_limit(limit)
            }
            _ => return plan_err!("Unknown runtime configuration: {variable}"),
            // Remember to update `reset_runtime_variable()` when adding new options
        };

        *state = SessionStateBuilder::from(state.clone())
            .with_runtime_env(Arc::new(builder.build()?))
            .build();

        Ok(())
    }

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