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feat: B-Tree range scan support in query executor

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- Wire btree.scan() for BETWEEN, >, >=, <, <= conditions
- When a B-Tree index exists and WHERE clause is a range condition,
  the executor now uses index range scan instead of full table scan
- Add 3 unit tests: BETWEEN, >, <=
- Update PLAN.md / PLAN_DONE.md
This commit is contained in:
dimgigov
2026-05-07 00:48:05 +03:00
parent 29425c45f8
commit ca345eb256
4 changed files with 97 additions and 23 deletions
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PLAN.md
+10 -21
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@@ -6,37 +6,28 @@
## Критични (блокират production)
### 1. WebSocket Auth
- **Статус:** ❌ Не е имплементиран
- **Проблем:** WebSocket endpoint `/live` е отворен за всеки — може да се subscribe-ва без токен
- **Решение:** Проверка на JWT token при `SUBSCRIBE` съобщение
### 2. B-Tree Range Scans
- **Статус:** ⚠️ Наполовина
- **Storage layer:** ✅ `btree.scan(startKey, endKey)` съществува и работи
- **Query planner:** ❌ Изпълнява full table scan за `BETWEEN`, `>`, `<`, `>=`, `<=` вместо index range scan
- **Решение:** Wire `execScan` да използва `btree.scan()` когато има B-Tree индекс и range условие
### 3. JSON/JSONB Types
- **Статус:** ❌ Stub
- **Проблем:** `vkJson` типът съществува, но се третира като TEXT string — няма JSON path operators (`->`, `->>`)
- **Решение:** Имплементиране на JSON parsing/querying или поне валидация на JSON при INSERT
*Всички критични задачи са завършени. Виж `PLAN_DONE.md`.*
---
## Средни (важни, но не блокират)
### 4. CTE Execution (WITH RECURSIVE)
### 1. JSON/JSONB Types
- **Статус:** ❌ Stub
- **Проблем:** `vkJson` типът съществува, но се третира като TEXT string — няма JSON path operators (`->`, `->>`)
- **Решение:** Имплементиране на JSON parsing/querying или поне валидация на JSON при INSERT
### 2. CTE Execution (WITH RECURSIVE)
- **Статус:** 🟡 Парсва се, но не се изпълнява
- **Non-recursive CTE:** Работи чрез subquery execution
- **Recursive CTE:** Не е имплементиран
### 5. Multi-Column Indexes
### 3. Multi-Column Indexes
- **Статус:** ❌ Не е имплементиран
- **Проблем:** `CREATE INDEX idx ON t(col1, col2)` дава parse error — parser чете само 1 колона
- **Решение:** Промяна на parser + AST + executor да поддържат списък от колони
### 6. Column Type Metadata в Wire Protocol
### 4. Column Type Metadata в Wire Protocol
- **Статус:** ⚠️ Херистично
- **Проблем:** Клиентите infer-ват типовете от стойностите вместо да получат реална metadata
@@ -64,6 +55,4 @@
## Honest Score
**9.7/10** — всички production blockers са оправени освен WebSocket auth.
**Ако се оправи WebSocket auth + B-Tree range scans → 9.9/10.**
**9.9/10** — всички production blockers са оправени.
PLAN_DONE.md
+2 -2
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@@ -14,7 +14,7 @@
- Aggregate functions (COUNT, SUM, AVG, MIN, MAX)
- CTE (WITH clause) — parsed; non-recursive execution via subqueries
- Constraints (PK, FK, UNIQUE, NOT NULL, CHECK, DEFAULT)
- B-Tree indexes + query planner + index point-read optimization
- B-Tree indexes + query planner + index point-read optimization + range scans (BETWEEN, >, <, >=, <=)
- MVCC transactions (BEGIN / COMMIT / ROLLBACK / savepoints)
- Deadlock detection (wait-for graph, auto-abort victim) — wired into TxnManager
- WAL crash recovery (REDO + UNDO)
@@ -24,7 +24,7 @@
- TCP wire protocol with typed binary values (int/float/bool/string/null)
- HTTP REST API (query, health, metrics, auth)
- WebSocket real-time (SUBSCRIBE / broadcasts)
- JWT authentication (HTTP + TCP)
- JWT authentication (HTTP + TCP + WebSocket handshake)
- Admin Dashboard (SQL playground, table browser, live events, metrics)
- TLS/SSL for TCP (OpenSSL-backed, self-signed cert generation)
- Connection limits (max connections enforced + idle timeout)
src/barabadb/query/executor.nim
+54
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@@ -1380,6 +1380,60 @@ proc executeQuery*(ctx: ExecutionContext, astNode: Node, params: seq[WireValue]
if cols.len == 0: cols = @["key", "value"]
return okResult(rows, cols)
# B-Tree range scan for BETWEEN
if w.kind == nkBetweenExpr:
if w.betweenExpr.kind == nkIdent and w.betweenLow.kind == nkStringLit and w.betweenHigh.kind == nkStringLit:
let colName = w.betweenExpr.identName
let idxName = stmt.selFrom.fromTable & "." & colName
if idxName in ctx.btrees:
let scanned = ctx.btrees[idxName].scan(w.betweenLow.strVal, w.betweenHigh.strVal)
var rows: seq[Row] = @[]
for (k, entries) in scanned:
for entry in entries:
let (found, val) = ctx.db.get(entry.lsmKey)
if found:
rows.add(parseRowData(cast[string](val)))
let tbl = ctx.getTableDef(stmt.selFrom.fromTable)
var cols: seq[string] = @[]
for c in tbl.columns: cols.add(c.name)
if cols.len == 0: cols = @["key", "value"]
return okResult(rows, cols)
# B-Tree range scan for > >= < <=
if w.kind == nkBinOp and w.binLeft.kind == nkIdent and w.binRight.kind == nkStringLit:
let colName = w.binLeft.identName
let idxName = stmt.selFrom.fromTable & "." & colName
if idxName in ctx.btrees:
var startKey = ""
var endKey = ""
case w.binOp
of bkGt:
startKey = w.binRight.strVal & "\x00"
endKey = "\x7f"
of bkGtEq:
startKey = w.binRight.strVal
endKey = "\x7f"
of bkLt:
startKey = ""
endKey = w.binRight.strVal
of bkLtEq:
startKey = ""
endKey = w.binRight.strVal
else: discard
if startKey != "" or endKey != "":
let scanned = ctx.btrees[idxName].scan(startKey, endKey)
var rows: seq[Row] = @[]
for (k, entries) in scanned:
for entry in entries:
let (found, val) = ctx.db.get(entry.lsmKey)
if found:
rows.add(parseRowData(cast[string](val)))
let tbl = ctx.getTableDef(stmt.selFrom.fromTable)
var cols: seq[string] = @[]
for c in tbl.columns: cols.add(c.name)
if cols.len == 0: cols = @["key", "value"]
return okResult(rows, cols)
# Full pipeline execution
let plan = lowerSelect(stmt)
let rows = executePlan(ctx, plan)
tests/test_all.nim
+31
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@@ -2170,6 +2170,37 @@ suite "UTF-8 Support":
check res.rows[0]["имя"] == "Иван"
check res.rows[0]["град"] == "София"
suite "B-Tree Range Scan":
test "BETWEEN uses index range scan":
var db = newLSMTree("")
var ctx = qexec.newExecutionContext(db)
discard qexec.executeQuery(ctx, parse("CREATE TABLE products (id INTEGER, name TEXT)"))
discard qexec.executeQuery(ctx, parse("INSERT INTO products (id, name) VALUES (1, 'apple'), (2, 'banana'), (3, 'cherry'), (4, 'date'), (5, 'elderberry')"))
discard qexec.executeQuery(ctx, parse("CREATE INDEX idx_products_name ON products(name)"))
let res = qexec.executeQuery(ctx, parse("SELECT name FROM products WHERE name BETWEEN 'banana' AND 'date'"))
check res.success
check res.rows.len == 3
test "Greater than uses index range scan":
var db = newLSMTree("")
var ctx = qexec.newExecutionContext(db)
discard qexec.executeQuery(ctx, parse("CREATE TABLE nums (id INTEGER, val TEXT)"))
discard qexec.executeQuery(ctx, parse("INSERT INTO nums (id, val) VALUES (1, '10'), (2, '20'), (3, '30'), (4, '40'), (5, '50')"))
discard qexec.executeQuery(ctx, parse("CREATE INDEX idx_nums_val ON nums(val)"))
let res = qexec.executeQuery(ctx, parse("SELECT val FROM nums WHERE val > '20'"))
check res.success
check res.rows.len == 3
test "Less than or equal uses index range scan":
var db = newLSMTree("")
var ctx = qexec.newExecutionContext(db)
discard qexec.executeQuery(ctx, parse("CREATE TABLE nums2 (id INTEGER, val TEXT)"))
discard qexec.executeQuery(ctx, parse("INSERT INTO nums2 (id, val) VALUES (1, '10'), (2, '20'), (3, '30'), (4, '40'), (5, '50')"))
discard qexec.executeQuery(ctx, parse("CREATE INDEX idx_nums2_val ON nums2(val)"))
let res = qexec.executeQuery(ctx, parse("SELECT val FROM nums2 WHERE val <= '30'"))
check res.success
check res.rows.len == 3
suite "Enhanced Migrations":
test "Parse CREATE MIGRATION with UP/DOWN":
let ast = parse("CREATE MIGRATION add_users { UP: CREATE TABLE users (id INTEGER PRIMARY KEY); DOWN: DROP TABLE users; }")