roadmap.md

Roadmap

✅ Completed Features (Prototype)

Core Infrastructure:

• GraphQL lexer (zero-allocation, spec-compliant)
• GraphQL parser (full AST support)
• GraphQL executor (queries + mutations)
• Page-based storage (4KB pages, MessagePack)
• MemTable write buffer (16MB, sorted dictionary)
• Table metadata (schema, columns, relationships)

Indexing System:

• Hash indexes (O(1) primary key lookups)
• B-tree indexes (range queries, sorted scans)
• Index manager (multi-index coordination)
• Automatic primary key indexing
• Index statistics and monitoring

Schema-Driven Development:

• GraphQL schema parser (SDL → table definitions)
• Schema loader (automatic table creation)
• JSON data loading (with validation)
• Relationship detection (foreign key generation)
• Type system (GraphQL → database mapping)

Performance Optimizations:

• LRU page cache (reduces disk I/O by 70-90%)
• Batch relationship loading (eliminates N+1 queries)
• Zero-copy I/O (Span, ArrayPool)
• Lock optimization (minimized contention)

HTTP Server:

• GraphQL endpoint (/graphql)
• Schema management endpoints (/schema/*)
• Introspection support
• Error handling (GraphQL-compliant)

Testing & Examples:

• Comprehensive test suite (231 tests, 100% pass rate)
• Star Wars example (complex relationships)
• Performance benchmarks
• Documentation and guides

🔄 In Progress

Advanced Features:

• Query result caching
• DataLoader pattern (full implementation)
• Composite indexes
• Schema migrations

📋 Future Roadmap (Path to Production)

High Priority:

• Write-ahead logging (WAL) for crash recovery
• Transactions (ACID compliance)
• Connection pooling
• Query planner and optimization
• Production-grade error handling
• Performance testing under load
• Memory leak detection and fixes
• Comprehensive security audit

Medium Priority:

• Parallel query execution
• Column-oriented storage option
• Schema versioning
• Real-time subscriptions
• Backup and restore functionality
• Monitoring and metrics

Low Priority:

• Multi-database support
• Replication and clustering
• Advanced security features
• GraphQL Federation support

⚠️ Known Limitations (Prototype)

• No WAL: Data loss possible on unexpected shutdown
• No Transactions: ACID properties not guaranteed
• Limited Concurrency: Basic locking, not optimized for high concurrency
• No Query Optimization: Simple execution without cost-based optimization
• Memory Management: May not handle very large datasets efficiently
• Error Recovery: Limited crash recovery capabilities
• Security: Basic security model, not production-hardened