Enum PeekOptimizer 

pub enum PeekOptimizer {
    Select(Optimizer),
    CopyTo(Optimizer),
}

The optimizer driving a one-shot statement through the peek sequencing state machine.

SELECT and EXPLAIN are optimized by the peek::Optimizer, while COPY TO is optimized by the copy_to::Optimizer. Both share the same surrounding state machine (timestamp selection, read holds, off-thread optimization, …), so this enum lets that shared machinery carry either optimizer without caring which one it is. The variants are kept distinct (rather than abstracted behind a trait object) because the downstream stages need to recover the concrete optimizer and its statement-specific result.

Variants

Select(Optimizer)

Optimizer for SELECT and EXPLAIN statements.

CopyTo(Optimizer)

Optimizer for COPY TO statements.

Implementations

impl PeekOptimizer

pub fn cluster_id(&self) -> ComputeInstanceId

The cluster that will run the optimized dataflow.

pub fn optimize( &mut self, raw_expr: HirRelationExpr, timestamp_ctx: TimestampContext, session: &dyn SessionMetadata, stats: Box<dyn StatisticsOracle>, ) -> Result<PeekGlobalLirPlan, OptimizerError>

Runs the full one-shot optimization pipeline end-to-end:

1. HIR ⇒ MIR lowering and local MIR optimization,
2. timestamp resolution,
3. global MIR optimization, MIR ⇒ LIR lowering, and global LIR optimization.

The pipeline shape is identical for both variants; only the concrete (statement-specific) plan types differ, so the steps are shared via optimize_oneshot.

pub fn into_select(self) -> Option<Optimizer>

Consumes self, returning the inner peek::Optimizer if this is the SELECT/EXPLAIN path and None otherwise.

pub fn into_copy_to(self) -> Option<Optimizer>

Consumes self, returning the inner copy_to::Optimizer if this is the COPY TO path and None otherwise.

Trait Implementations

impl Debug for PeekOptimizer

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.