Method optimize

src/clusterd-test-driver/src/dataflow.rs:406–409

Run the MIR dataflow optimizer in [`Self::finish`] before lowering. Off by default: the builder otherwise lowers the caller's MIR faithfully (the contract above). Enable it for plans that don't lower from raw MIR — notably a `Join`, whose `implementation` defaults to `Unimplemented` and is rejected by the LIR lowering until [`mz_transform::optimize_dataflow`]'s `JoinImplementation` fills it in —

(&mut self)

    /// fills it in — or to reproduce the plan `environmentd` would ship for a logical
    /// expression rather than the literal one written.
    pub fn optimize(&mut self) -> &mut Self {
        self.optimize = true;
        self
    }

    /// Lower the accumulated MIR and attach persist wiring, producing the
    /// `DataflowDescription` the compute protocol expects.