# TODO
## ✅ Completed Features
### 1. WAL (Write-Ahead Logging) Implementation
- [x] Create `src/storage/wal.rs` module for write-ahead logging
- [x] Implement WAL file format and operations
- [x] Add WAL integration to BTree for durability
- [x] Add crash recovery mechanism
- [x] Add tests for WAL functionality
### 2. Transaction Support
- [x] Create `src/storage/transaction.rs` module
- [x] Implement BEGIN, COMMIT, ROLLBACK operations
- [x] Add transaction isolation support
- [x] Integrate transactions with storage engine
- [x] Add transaction tests
### 3. Basic SQL Features
- [x] Add DELETE FROM support in parser and executor
- [x] Add DROP TABLE support
- [x] Add WHERE clause with basic operators (=, !=, >, <, >=, <=)
- [x] Add CREATE TABLE support
- [x] Add INSERT INTO support
- [x] Add SELECT support
- [x] Add UPDATE support
### 4. Documentation (Completed)
- [x] Create ARCHITECTURE.md with detailed design
- [x] Create comprehensive examples (basic_usage, comprehensive_demo)
- [x] Update README with all features
- [x] Create SPEC.md with technical specifications
- [x] Create AGENTS.md for development guide
### 5. Testing (Completed)
- [x] Add comprehensive unit tests (127 tests passing)
- [x] Add integration tests for complex workflows
- [x] Add DELETE and DROP TABLE tests
- [x] Add aggregate function tests (13 tests)
- [x] Add GROUP BY tests (10 tests)
- [x] Add JOIN tests (11 tests)
- [x] Add index tests (16 tests)
### 6. Code Quality (Completed)
- [x] Fix dead code warnings (PageCache::remove, normalize)
- [x] Fix all naming issues (sql-rs to sql_rs)
- [x] Ensure all tests pass
## 🚧 In Progress / Next Priority
### Advanced SQL Features
- [x] Add ORDER BY support (ASC/DESC)
- [x] Add LIMIT/OFFSET support
- [x] Add comprehensive tests for ORDER BY and LIMIT/OFFSET (10 tests)
- [x] Add WHERE clause with multiple conditions (AND/OR)
- [x] Add comprehensive tests for AND/OR (12 tests)
- [x] Add aggregate functions (COUNT, SUM, AVG, MIN, MAX)
- [x] Add comprehensive tests for aggregate functions (13 tests)
- [x] Add GROUP BY support
- [x] Add comprehensive tests for GROUP BY (10 tests)
- [x] Add JOIN support (INNER, LEFT, RIGHT)
- [x] Add comprehensive tests for JOIN (11 tests)
### 4. Indexing (Completed)
- [x] Implement secondary indexes
- [x] Add CREATE INDEX support
- [x] Add DROP INDEX support
- [x] Add index persistence
- [x] Add comprehensive tests for indexes (16 tests)
### 5. Vector Database Enhancements
- [ ] Add vector persistence to storage engine
- [ ] Implement vector collection metadata storage
- [ ] Add batch vector operations
- [ ] Add vector filtering with metadata
- [ ] Optimize HNSW index performance
### 6. Performance Optimizations
- [ ] Add query optimizer
- [ ] Implement query plan caching
- [ ] Add connection pooling
- [ ] Optimize B-tree node splitting
- [ ] Add memory-mapped file support optimization
- [ ] Add benchmark suite with criterion
### 7. CLI Enhancements
- [ ] Add interactive REPL mode
- [ ] Add batch import/export (CSV, JSON)
- [ ] Add database backup/restore commands
- [ ] Add database statistics command
- [ ] Add verbose/debug logging options
### 8. Documentation
- [ ] Create ARCHITECTURE.md with detailed design
- [ ] Add API documentation for all public interfaces
- [ ] Create user guide with examples
- [ ] Add performance tuning guide
- [ ] Create migration guide
### 9. Testing
- [ ] Add comprehensive unit tests for all modules
- [ ] Add integration tests for complex workflows
- [ ] Add benchmark tests
- [ ] Add fuzzing tests for parser
- [ ] Add property-based tests
### 10. Code Quality
- [ ] Fix dead code warnings (PageCache::remove, normalize)
- [ ] Add rustfmt configuration
- [ ] Add clippy configuration
- [ ] Add CI/CD pipeline configuration
- [ ] Add code coverage reporting
## Bugs to Fix
- [ ] Ensure proper error handling in all edge cases
- [ ] Fix potential memory leaks in page cache
- [ ] Validate all user inputs properly
## Nice to Have
- [ ] Add compression support for large values
- [ ] Add encryption support
- [ ] Add replication support
- [ ] Add multi-threading support for queries
- [ ] Add SQL prepared statements
- [ ] Add stored procedures support
## License
Copyright 2025 SQL-RS Contributors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.