Module cache 

Query cache for parsed and planned queries.

This module provides an LRU cache for query plans to avoid repeated parsing and optimization of frequently executed queries.

Cache Levels

• Parsed cache: Caches logical plans after translation (language-specific parsing)
• Optimized cache: Caches logical plans after optimization

Usage

let cache = QueryCache::new(1000);

// Check cache first
if let Some(plan) = cache.get_optimized(&cache_key) {
    return execute(plan);
}

// Parse and optimize
let plan = parse_and_optimize(query)?;
cache.put_optimized(cache_key, plan.clone());
execute(plan)

Structs

CacheKey

Cache key combining query text and language.

CacheStats

Cache statistics.

CachingQueryProcessor

A caching wrapper for the query processor.

QueryCache

Query cache for parsed and optimized plans.