Method optimize

src/adapter/src/optimize.rs:177–198

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`].

(
        &mut self,
        raw_expr: HirRelationExpr,
        timestamp_ctx: TimestampContext,
        session: &dyn SessionMetadata,
        stats: Box<dyn StatisticsOracle>,
    )

    /// (statement-specific) plan types differ, so the steps are shared via
    /// [`optimize_oneshot`].
    pub fn optimize(
        &mut self,
        raw_expr: HirRelationExpr,
        timestamp_ctx: TimestampContext,
        session: &dyn SessionMetadata,
        stats: Box<dyn StatisticsOracle>,
    ) -> Result<PeekGlobalLirPlan, OptimizerError> {
        match self {
            PeekOptimizer::Select(optimizer) => {
                let plan = optimize_oneshot(optimizer, raw_expr, |local_mir_plan| {
                    local_mir_plan.resolve(timestamp_ctx, session, stats)
                })?;
                Ok(PeekGlobalLirPlan::Select(plan))
            }
            PeekOptimizer::CopyTo(optimizer) => {
                let plan = optimize_oneshot(optimizer, raw_expr, |local_mir_plan| {
                    local_mir_plan.resolve(timestamp_ctx, session, stats)
                })?;
                Ok(PeekGlobalLirPlan::CopyTo(plan))
            }
        }
    }

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