Method cache_query_plan

src/optimization/read_only_optimizer.rs:205–214

Cache a new query plan

(&self, cache_key: String, plan: CachedQueryPlan)

    /// Cache a new query plan
    fn cache_query_plan(&self, cache_key: String, plan: CachedQueryPlan) {
        let mut plans = self.query_plans.write().unwrap();
        
        // Check if we need to evict entries
        if plans.len() >= self.max_cache_size {
            self.evict_least_valuable_plan(&mut plans);
        }
        
        plans.insert(cache_key, plan);
    }

    /// Evict the least valuable cached plan
    fn evict_least_valuable_plan(&self, plans: &mut HashMap<String, CachedQueryPlan>) {