- Added TxnManager to server and ExecutionContext
- Per-connection ExecutionContext with isolated transaction state
- BEGIN creates new transaction via MVCC
- INSERT/DELETE uses transaction write buffer when active
- COMMIT flushes write set to LSM-Tree
- ROLLBACK aborts and discards pending writes
- cloneForConnection() shares tables/btrees/data, isolates transactions
- All 216 tests pass
- NOT NULL, PRIMARY KEY, UNIQUE, DEFAULT constraint validation on INSERT
- B-Tree indexes created for PK and UNIQUE columns on CREATE TABLE
- Indexes auto-populated during INSERT
- SELECT uses B-Tree index for point reads (WHERE id = 'x')
- Indexes cleaned up on DROP TABLE
- EXPLAIN output shows index usage vs full scan
- All 216 tests pass
- Server now reads binary wire protocol messages (header + payload)
- Implements recvExact for reliable message framing
- Query execution against LSM-Tree for SELECT/INSERT/DELETE
- SELECT supports point reads (WHERE key = 'value') and full scans
- INSERT parses simple EdgeDB-style syntax
- DELETE with WHERE clause
- Wire protocol responses: Data, Complete, Error, Pong
- Export wire protocol read/write helpers for external use
- Add scanMemTable to LSMTree for full scans
- Add GEL/ to .gitignore
- All 214 tests pass
- Add Current Status / Limitations section to README
- Fix benchmark compilation (Duration.ticks → inNanoseconds)
- Implement real SSTable binary format with write/read/mmap support
- Add BloomFilter serialize/deserialize for disk storage
- Fix mmap.nim to use posix.open instead of system.open
- New PLAN.md with improvement roadmap
- All 214 tests pass
Critical fixes:
- B-Tree splitChild: fixed out-of-bounds on child.children.len (mid+1..len → mid+1..<len)
- Wire protocol: all deserializeValue cases now properly assign to result
- Wire protocol: fkBool/fkInt8 now increment pos after reading
- MVCC: write-write conflict now detected for completed transactions
- MVCC: commit only marks visible versions as deleted (not concurrent uncommitted)
- Lexer: buffer overrun on backslash escape at end of input — added bounds check
- Bulgarian/Russian stemmers: fixed UTF-8 byte offsets for Cyrillic suffixes (2 bytes per char)
High fixes:
- WebSocket: added missing std/tables import
- Raft: added randomize() call for election timeouts
- MemTable.get: binary search O(log n) instead of linear scan O(n)
Medium fixes:
- Zerocopy: string length now written as 4-byte int32 (was single byte)
- Raft appendEntries: guard against nextIdx underflow
- Columnar: null tracking with nulls seq on ColumnPtr
- Removed dead code in lexer readIdent (redundant true/false checks)
- Updated Bulgarian stemming test to match corrected byte offsets
All 214 tests pass across 48 suites with 0 failures.
Crash Recovery:
- WAL file scanning with magic/version/entry parsing
- REDO/UNDO analysis — identify committed vs uncommitted txns
- Summary reporting with entry/txn/apply status
Raft Election Timer:
- ElectionTimer with configurable timeout and tick/check/reset
- Automatic election start on follower timeout
- Candidate timeout restart on failed elections
CLI Autocomplete:
- Full autocomplete engine for commands and SQL keywords
- Suggest function for single/multi completions
- 60+ keywords (SELECT, FROM, WHERE, JOIN, GROUP BY, etc.)
ROADMAP.md:
- All completed items properly marked
- Updated status table — 9 out of 12 phases at 90%+
14 new tests (246 total, all passing)
Zero-Copy Serialization:
- Direct memory buffer with schema-based field offsets
- Write/read int32/int64/float/bool/string without copies
- FastMem copy operations (fastCopy, fastCopyFrom, slice)
- ZcTable for batch columnar records
Adaptive Query Execution:
- Cardinality estimation with exponential moving average
- Reoptimize triggers when actual/estimated row ratio exceeds threshold
- Plan caching with hash-based lookup
- Execution context with parallelism hints and explain
Distributed Transactions:
- Two-phase commit across multiple nodes
- Saga pattern with step-by-step execute/compensate
- DistTxnManager with cleanup lifecycle
Vector Batch Operations:
- batchInsert/batchSearch for HNSW and IVF-PQ
- IndexWatcher with auto-rebuild based on unindexed count and ratio
- Rebuild statistics tracking
26 new tests (222 total, all passing)
dimgigov