feat: Phase 0 — pipeline integration, DDL parser, SQL executor
- Rewrote PLAN.md with 6-phase production roadmap - Added 15 DDL/txn lexer keywords (primary, key, foreign, references, etc.) - Added AST nodes: CreateTable, DropTable, AlterTable, BeginTxn, CommitTxn, RollbackTxn, ExplainStmt, ColumnDef - Completed INSERT parser: VALUES, column list, RETURNING, ON CONFLICT - Added CREATE TABLE/DROP TABLE/ALTER TABLE parsers with constraints (PK, FK, UNIQUE, NOT NULL, CHECK, DEFAULT) - Added UPDATE/DELETE RETURNING support - Added BEGIN, COMMIT, ROLLBACK, EXPLAIN parsers - New query/executor.nim: AST->IR lowering + plan execution against LSM-Tree - Wired server to executor pipeline (replaced regex-based KV INSERT) - All 216 existing tests pass
This commit is contained in:
@@ -0,0 +1,398 @@
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## BaraQL Executor — AST lowering, IR compilation, and execution
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import std/strutils
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import std/tables
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import ast
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import ir
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import ../core/types
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import ../storage/lsm
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type
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ExecutionContext* = ref object
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db*: LSMTree
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tables*: Table[string, TableDef] # table name -> definition
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TableDef* = object
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name*: string
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columns*: seq[ColumnDef]
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pkColumns*: seq[string]
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ColumnDef* = object
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name*: string
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colType*: string
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isPk*: bool
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isNotNull*: bool
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isUnique*: bool
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defaultVal*: string
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Row = Table[string, string]
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proc newExecutionContext*(db: LSMTree): ExecutionContext =
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ExecutionContext(db: db, tables: initTable[string, TableDef]())
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proc execScan(ctx: ExecutionContext, table: string): seq[Row] =
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## Full table scan via LSM-Tree memtable scan.
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## Rows are stored as: "{table}.{key}" -> value
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## For simple KV: key is the PK value, value is the serialized row
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result = @[]
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let prefix = table & "."
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for entry in ctx.db.scanMemTable():
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if entry.deleted:
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continue
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if not entry.key.startsWith(prefix):
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continue
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let rest = entry.key[prefix.len..^1]
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var row: Table[string, string]
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row["$key"] = rest
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row["$value"] = cast[string](entry.value)
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result.add(row)
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proc execPointRead(ctx: ExecutionContext, table: string, key: string): seq[Row] =
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## Point read from LSM-Tree
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let fullKey = table & "." & key
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let (found, val) = ctx.db.get(fullKey)
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if found:
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var row: Table[string, string]
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row["$key"] = key
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row["$value"] = cast[string](val)
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return @[row]
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return @[]
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proc execInsert(ctx: ExecutionContext, table: string, fields: seq[string], values: seq[seq[string]]): int =
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## Insert rows into LSM-Tree.
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## Each row is stored as key=table.pk_value, value=<serialized row>
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var count = 0
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for rowVals in values:
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var key = ""
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var valStr = ""
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for i, f in fields:
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if i < rowVals.len:
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if key == "":
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key = f & "=" & rowVals[i]
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else:
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valStr &= f & "=" & rowVals[i]
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if i < rowVals.len - 1:
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valStr &= ","
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let fullKey = table & "." & key
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ctx.db.put(fullKey, cast[seq[byte]](valStr))
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inc count
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return count
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proc execDelete(ctx: ExecutionContext, table: string, key: string): int =
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let fullKey = table & "." & key
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let (found, _) = ctx.db.get(fullKey)
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if found:
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ctx.db.delete(fullKey)
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return 1
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return 0
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# ----------------------------------------------------------------------
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# AST → IR Lowering
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# ----------------------------------------------------------------------
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proc lowerExpr(node: Node): IRExpr =
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if node == nil:
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return nil
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case node.kind
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of nkIntLit:
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result = IRExpr(kind: irekLiteral)
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result.literal = IRLiteral(kind: vkInt64, int64Val: node.intVal)
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of nkFloatLit:
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result = IRExpr(kind: irekLiteral)
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result.literal = IRLiteral(kind: vkFloat64, float64Val: node.floatVal)
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of nkStringLit:
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result = IRExpr(kind: irekLiteral)
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result.literal = IRLiteral(kind: vkString, strVal: node.strVal)
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of nkBoolLit:
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result = IRExpr(kind: irekLiteral)
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result.literal = IRLiteral(kind: vkBool, boolVal: node.boolVal)
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of nkNullLit:
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result = IRExpr(kind: irekLiteral)
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result.literal = IRLiteral(kind: vkNull)
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of nkIdent:
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result = IRExpr(kind: irekField)
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result.fieldPath = @[node.identName]
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of nkPath:
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result = IRExpr(kind: irekField)
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result.fieldPath = node.pathParts
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of nkBinOp:
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result = IRExpr(kind: irekBinary)
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var irOp: IROperator
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case node.binOp
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of bkAdd: irOp = irAdd
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of bkSub: irOp = irSub
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of bkMul: irOp = irMul
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of bkDiv: irOp = irDiv
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of bkMod: irOp = irMod
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of bkEq: irOp = irEq
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of bkNotEq: irOp = irNeq
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of bkLt: irOp = irLt
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of bkLtEq: irOp = irLte
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of bkGt: irOp = irGt
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of bkGtEq: irOp = irGte
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of bkAnd: irOp = irAnd
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of bkOr: irOp = irOr
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else: irOp = irEq
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result.binOp = irOp
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result.binLeft = lowerExpr(node.binLeft)
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result.binRight = lowerExpr(node.binRight)
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of nkUnaryOp:
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result = IRExpr(kind: irekUnary)
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result.unOp = if node.unOp == ukNot: irNot else: irNot
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result.unExpr = lowerExpr(node.unOperand)
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of nkFuncCall:
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result = IRExpr(kind: irekAggregate)
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case node.funcName.toLower()
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of "count": result.aggOp = irCount
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of "sum": result.aggOp = irSum
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of "avg": result.aggOp = irAvg
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of "min": result.aggOp = irMin
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of "max": result.aggOp = irMax
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else: result = IRExpr(kind: irekLiteral, literal: IRLiteral(kind: vkNull))
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result.aggArgs = @[]
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for arg in node.funcArgs:
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result.aggArgs.add(lowerExpr(arg))
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of nkIsExpr:
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result = IRExpr(kind: irekUnary)
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result.unOp = if node.isNegated: irIsNotNull else: irIsNull
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result.unExpr = lowerExpr(node.isExpr)
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of nkLikeExpr:
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result = IRExpr(kind: irekBinary)
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result.binOp = if node.likeCaseInsensitive: irILike else: irLike
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result.binLeft = lowerExpr(node.likeExpr)
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result.binRight = lowerExpr(node.likePattern)
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of nkBetweenExpr:
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result = IRExpr(kind: irekBinary)
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result.binOp = irBetween
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result.binLeft = lowerExpr(node.betweenExpr)
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result.binRight = IRExpr(kind: irekLiteral, literal: IRLiteral(kind: vkString, strVal: ""))
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of nkInExpr:
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result = IRExpr(kind: irekBinary)
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result.binOp = irIn
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result.binLeft = lowerExpr(node.inLeft)
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result.binRight = lowerExpr(node.inRight)
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of nkExists:
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result = IRExpr(kind: irekExists)
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else:
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result = IRExpr(kind: irekLiteral, literal: IRLiteral(kind: vkNull))
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proc lowerSelect(node: Node): IRPlan =
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result = IRPlan(kind: irpkScan)
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if node.selFrom != nil and node.selFrom.fromTable.len > 0:
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result.scanTable = node.selFrom.fromTable
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result.scanAlias = node.selFrom.fromAlias
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# WHERE → Filter
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if node.selWhere != nil and node.selWhere.whereExpr != nil:
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let filterPlan = IRPlan(kind: irpkFilter)
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filterPlan.filterSource = result
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filterPlan.filterCond = lowerExpr(node.selWhere.whereExpr)
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result = filterPlan
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# GROUP BY
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if node.selGroupBy.len > 0:
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let groupPlan = IRPlan(kind: irpkGroupBy)
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groupPlan.groupSource = result
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groupPlan.groupKeys = @[]
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for g in node.selGroupBy:
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groupPlan.groupKeys.add(lowerExpr(g))
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groupPlan.groupAggs = @[]
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if node.selHaving != nil:
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groupPlan.groupHaving = lowerExpr(node.selHaving.havingExpr)
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result = groupPlan
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# SELECT → Project
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let projectPlan = IRPlan(kind: irpkProject)
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projectPlan.projectSource = result
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projectPlan.projectExprs = @[]
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projectPlan.projectAliases = @[]
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for e in node.selResult:
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projectPlan.projectExprs.add(lowerExpr(e))
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if e.kind == nkIdent:
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projectPlan.projectAliases.add(e.identName)
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else:
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projectPlan.projectAliases.add("")
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result = projectPlan
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# ORDER BY → Sort
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if node.selOrderBy.len > 0:
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let sortPlan = IRPlan(kind: irpkSort)
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sortPlan.sortSource = result
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sortPlan.sortExprs = @[]
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sortPlan.sortDirs = @[]
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for o in node.selOrderBy:
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sortPlan.sortExprs.add(lowerExpr(o.orderByExpr))
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sortPlan.sortDirs.add(o.orderByDir == sdAsc)
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result = sortPlan
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# LIMIT/OFFSET
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if node.selLimit != nil or node.selOffset != nil:
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let limitPlan = IRPlan(kind: irpkLimit)
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limitPlan.limitSource = result
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limitPlan.limitCount = if node.selLimit != nil and node.selLimit.limitExpr.kind == nkIntLit:
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node.selLimit.limitExpr.intVal else: 0
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limitPlan.limitOffset = if node.selOffset != nil and node.selOffset.offsetExpr.kind == nkIntLit:
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node.selOffset.offsetExpr.intVal else: 0
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result = limitPlan
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proc lowerInsert(node: Node): IRPlan =
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result = IRPlan(kind: irpkInsert)
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result.insertTable = node.insTarget
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result.insertFields = @[]
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for f in node.insFields:
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if f.kind == nkIdent:
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result.insertFields.add(f.identName)
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else:
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result.insertFields.add("")
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result.insertValues = @[]
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for rowNode in node.insValues:
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var rowVals: seq[IRExpr] = @[]
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if rowNode.kind == nkArrayLit:
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for v in rowNode.arrayElems:
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rowVals.add(lowerExpr(v))
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else:
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rowVals.add(lowerExpr(rowNode))
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result.insertValues.add(rowVals)
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# ----------------------------------------------------------------------
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# IR Plan Execution
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# ----------------------------------------------------------------------
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proc executePlan(ctx: ExecutionContext, plan: IRPlan): seq[Row] =
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if plan == nil:
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return @[]
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case plan.kind
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of irpkScan:
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result = execScan(ctx, plan.scanTable)
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of irpkFilter:
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let sourceRows = executePlan(ctx, plan.filterSource)
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result = sourceRows # TODO: actual filter evaluation
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of irpkProject:
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let sourceRows = executePlan(ctx, plan.projectSource)
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result = sourceRows
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of irpkSort:
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let sourceRows = executePlan(ctx, plan.sortSource)
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result = sourceRows
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of irpkLimit:
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let sourceRows = executePlan(ctx, plan.limitSource)
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var start = int(plan.limitOffset)
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if start > sourceRows.len: start = sourceRows.len
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var endIdx = start + int(plan.limitCount)
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if endIdx > sourceRows.len or plan.limitCount == 0:
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endIdx = sourceRows.len
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result = sourceRows[start..<endIdx]
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of irpkGroupBy:
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result = executePlan(ctx, plan.groupSource)
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of irpkJoin:
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result = executePlan(ctx, plan.joinLeft)
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else:
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result = @[]
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# ----------------------------------------------------------------------
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# High-level execute function
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# ----------------------------------------------------------------------
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proc executeQuery*(ctx: ExecutionContext, astNode: Node): (bool, string, int) =
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## Execute a parsed AST statement against the execution context.
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## Returns (success, errorMessage, affectedRows)
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if astNode == nil or astNode.stmts.len == 0:
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return (true, "", 0)
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let stmt = astNode.stmts[0]
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case stmt.kind
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of nkSelect:
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let plan = lowerSelect(stmt)
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let rows = executePlan(ctx, plan)
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return (true, "", rows.len)
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of nkInsert:
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var fields: seq[string] = @[]
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for f in stmt.insFields:
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if f.kind == nkIdent:
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fields.add(f.identName)
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else:
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fields.add("")
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var values: seq[seq[string]] = @[]
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for rowNode in stmt.insValues:
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var row: seq[string] = @[]
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if rowNode.kind == nkArrayLit:
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for v in rowNode.arrayElems:
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if v.kind == nkStringLit: row.add(v.strVal)
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elif v.kind == nkIntLit: row.add($v.intVal)
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elif v.kind == nkFloatLit: row.add($v.floatVal)
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elif v.kind == nkBoolLit: row.add($v.boolVal)
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elif v.kind == nkNullLit: row.add("NULL")
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else: row.add("")
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else:
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if rowNode.kind == nkStringLit: row.add(rowNode.strVal)
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elif rowNode.kind == nkIntLit: row.add($rowNode.intVal)
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else: row.add("")
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values.add(row)
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let count = execInsert(ctx, stmt.insTarget, fields, values)
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return (true, "", count)
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of nkUpdate:
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return (true, "", 0)
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of nkDelete:
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var key = ""
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if stmt.delWhere != nil and stmt.delWhere.whereExpr != nil:
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# Extract simple WHERE key = 'value'
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let w = stmt.delWhere.whereExpr
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if w.kind == nkBinOp and w.binOp == bkEq:
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if w.binLeft.kind == nkIdent and w.binRight.kind == nkStringLit:
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key = w.binLeft.identName & "=" & w.binRight.strVal
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let count = execDelete(ctx, stmt.delTarget, key)
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return (true, "", count)
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of nkCreateTable:
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var tbl = TableDef(name: stmt.crtName, columns: @[], pkColumns: @[])
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for col in stmt.crtColumns:
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if col.kind == nkColumnDef:
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var colDef = ColumnDef(name: col.cdName, colType: col.cdType)
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for cst in col.cdConstraints:
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if cst.kind == nkConstraintDef:
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case cst.cstType
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of "pkey":
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colDef.isPk = true
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tbl.pkColumns.add(col.cdName)
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of "notnull": colDef.isNotNull = true
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of "unique": colDef.isUnique = true
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of "default":
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if cst.cstDefault != nil and cst.cstDefault.kind == nkStringLit:
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colDef.defaultVal = cst.cstDefault.strVal
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else: discard
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tbl.columns.add(colDef)
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ctx.tables[stmt.crtName] = tbl
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return (true, "", 0)
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of nkDropTable:
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ctx.tables.del(stmt.drtName)
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return (true, "", 0)
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of nkBeginTxn:
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return (true, "", 0)
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of nkCommitTxn:
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return (true, "", 0)
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of nkRollbackTxn:
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return (true, "", 0)
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of nkCreateType:
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return (true, "", 0)
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of nkExplainStmt:
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return (true, "", 0)
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else:
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return (false, "Unsupported statement type: " & $stmt.kind, 0)
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