Method return_none

datafusion/datasource/src/morsel/mocks.rs:394–397

Adds one planning step that reports the planner is exhausted.

(mut self)

    /// Adds one planning step that reports the planner is exhausted.
    pub(crate) fn return_none(mut self) -> Self {
        self.steps.push(PlannerStep::None);
        self
    }

    /// Adds one planning step that fails during CPU planning.
    pub(crate) fn return_error(mut self, message: impl Into<String>) -> Self {