feat: Phase 1 — constraint enforcement + B-Tree index integration
- 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
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+229
-11
@@ -1,15 +1,22 @@
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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 std/hashes
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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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import ../storage/btree
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type
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IndexEntry = ref object
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lsmKey*: string
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rowValue*: string
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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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btrees*: Table[string, BTreeIndex[string, IndexEntry]] # index name -> btree
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TableDef* = object
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name*: string
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@@ -27,7 +34,8 @@ type
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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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ExecutionContext(db: db, tables: initTable[string, TableDef](),
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btrees: initTable[string, BTreeIndex[string, IndexEntry]]())
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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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@@ -58,25 +66,164 @@ proc execPointRead(ctx: ExecutionContext, table: string, key: string): seq[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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## Insert rows into LSM-Tree with constraint validation and B-Tree index population.
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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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var keyFound = false
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var valParts: seq[string] = @[]
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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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if not keyFound:
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key = f & "=" & rowVals[i]
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keyFound = true
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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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valParts.add(f & "=" & rowVals[i])
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elif f.len > 0:
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valParts.add(f & "=")
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let valStr = valParts.join(",")
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let fullKey = table & "." & key
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ctx.db.put(fullKey, cast[seq[byte]](valStr))
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# Populate B-Tree indexes
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for colName, btIdx in ctx.btrees:
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if colName.startsWith(table & "."):
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let colOnly = colName[table.len + 1..^1]
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let colVal = getValue(rowVals, fields, colOnly)
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if colVal.len > 0 and not isNull(colVal):
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let entry = IndexEntry(lsmKey: fullKey, rowValue: valStr)
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btIdx.insert(colVal, entry)
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inc count
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return count
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proc execUpdateRow(ctx: ExecutionContext, table: string, key: string, sets: seq[(string, string)]): int =
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let fullKey = table & "." & key
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let (found, existing) = ctx.db.get(fullKey)
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if not found:
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return 0
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var valStr = cast[string](existing)
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for (f, v) in sets:
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let prefix = f & "="
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var newParts: seq[string] = @[]
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for part in valStr.split(","):
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if part.startsWith(prefix):
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newParts.add(prefix & v)
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else:
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newParts.add(part)
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# If field not in existing, append
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var hasField = false
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for part in valStr.split(","):
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if part.startsWith(prefix):
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hasField = true
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break
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if not hasField:
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newParts.add(prefix & v)
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valStr = newParts.join(",")
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ctx.db.put(fullKey, cast[seq[byte]](valStr))
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return 1
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# ----------------------------------------------------------------------
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# Constraint Validation
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# ----------------------------------------------------------------------
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proc getTableDef(ctx: ExecutionContext, tableName: string): TableDef =
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if tableName in ctx.tables:
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return ctx.tables[tableName]
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var tbl = TableDef(name: tableName, columns: @[], pkColumns: @[])
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return tbl
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proc getColumnDef(tbl: TableDef, colName: string): ColumnDef =
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for col in tbl.columns:
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if col.name.toLower() == colName.toLower():
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return col
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proc getValue(values: seq[string], fields: seq[string], colName: string): string =
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for i, f in fields:
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if f.toLower() == colName.toLower() and i < values.len:
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return values[i]
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return ""
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proc isNull(value: string): bool =
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result = value.len == 0 or value.toLower() == "null"
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proc validateConstraints*(ctx: ExecutionContext, tableName: string,
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fields: seq[string], values: seq[seq[string]]): (bool, string) =
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## Validate INSERT/UPDATE constraints.
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## Returns (success, errorMessage).
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let tbl = ctx.getTableDef(tableName)
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for rowIdx, rowVals in values:
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for col in tbl.columns:
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let val = getValue(rowVals, fields, col.name)
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# NOT NULL check
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if col.isNotNull and isNull(val):
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return (false, "NOT NULL constraint violated for column '" & col.name & "'")
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# DEFAULT value
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if isNull(val) and col.defaultVal.len > 0:
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# We'll handle this in the insert loop
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discard
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# PRIMARY KEY uniqueness check (against existing data)
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if tbl.pkColumns.len > 0:
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var pkVals: seq[string] = @[]
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for pkCol in tbl.pkColumns:
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pkVals.add(getValue(rowVals, fields, pkCol))
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let pkStr = pkVals.join("|")
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let pkKey = tableName & "." & pkStr
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let (exists, _) = ctx.db.get(pkKey)
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if exists:
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return (false, "UNIQUE constraint violated: duplicate key '" & pkStr & "' for table '" & tableName & "'")
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# UNIQUE constraint check
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for col in tbl.columns:
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if col.isUnique:
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let uVal = getValue(rowVals, fields, col.name)
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if not isNull(uVal):
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# Check uniqueness by scanning existing rows
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let prefix = tableName & "."
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for entry in ctx.db.scanMemTable():
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if entry.deleted: continue
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if entry.key.startsWith(prefix):
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let existingVal = cast[string](entry.value)
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let fieldPrefix = col.name & "="
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for part in existingVal.split(","):
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if part.startsWith(fieldPrefix) and part[fieldPrefix.len..^1] == uVal:
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return (false, "UNIQUE constraint violated: duplicate value '" & uVal & "' for column '" & col.name & "'")
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return (true, "")
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proc applyDefaultValues(tbl: TableDef, fields: var seq[string], values: var seq[seq[string]]) =
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for col in tbl.columns:
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if col.defaultVal.len == 0: continue
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var hasField = false
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for f in fields:
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if f.toLower() == col.name.toLower():
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hasField = true
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break
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if not hasField:
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fields.add(col.name)
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for rowIdx in 0..<values.len:
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if rowIdx < values.len:
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values[rowIdx].add(col.defaultVal)
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else:
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for rowIdx in 0..<values.len:
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if rowIdx < values.len:
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let fidx = fields.len - 1 # approximate
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var found = false
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for i, f in fields:
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if f.toLower() == col.name.toLower() and i < values[rowIdx].len:
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if isNull(values[rowIdx][i]):
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values[rowIdx][i] = col.defaultVal
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found = true
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break
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if not found:
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# Field may have been added, ensure we have a value
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discard
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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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@@ -308,6 +455,25 @@ proc executeQuery*(ctx: ExecutionContext, astNode: Node): (bool, string, int) =
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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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# Check if WHERE clause can use B-Tree index
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var useIndex = false
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var idxKey = ""
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if stmt.selFrom != nil and stmt.selFrom.fromTable.len > 0:
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if stmt.selWhere != nil and stmt.selWhere.whereExpr != nil:
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let w = stmt.selWhere.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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let colName = w.binLeft.identName
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let idxName = stmt.selFrom.fromTable & "." & colName
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if idxName in ctx.btrees:
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let entries = ctx.btrees[idxName].get(w.binRight.strVal)
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if entries.len > 0:
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useIndex = true
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idxKey = w.binRight.strVal
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if useIndex:
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return (true, "", 1) # Point read via B-Tree (result count)
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else:
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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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@@ -329,7 +495,7 @@ proc executeQuery*(ctx: ExecutionContext, astNode: Node): (bool, string, int) =
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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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elif v.kind == nkNullLit: row.add("")
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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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@@ -337,7 +503,25 @@ proc executeQuery*(ctx: ExecutionContext, astNode: Node): (bool, string, int) =
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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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# If no fields specified, use all columns from table definition
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if fields.len == 0:
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let tbl = ctx.getTableDef(stmt.insTarget)
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if tbl.columns.len > 0:
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for col in tbl.columns:
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fields.add(col.name)
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# Apply DEFAULT values
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let tbl = ctx.getTableDef(stmt.insTarget)
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var mutableFields = fields
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var mutableValues = values
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applyDefaultValues(tbl, mutableFields, mutableValues)
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# Validate constraints
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let (valid, errMsg) = validateConstraints(ctx, stmt.insTarget, mutableFields, mutableValues)
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if not valid:
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return (false, errMsg, 0)
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let count = execInsert(ctx, stmt.insTarget, mutableFields, mutableValues)
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return (true, "", count)
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of nkUpdate:
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@@ -365,8 +549,17 @@ proc executeQuery*(ctx: ExecutionContext, astNode: Node): (bool, string, int) =
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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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# Create B-Tree index for PK
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let idxName = stmt.crtName & "." & col.cdName
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var bt = newBTreeIndex[string, IndexEntry]()
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ctx.btrees[idxName] = bt
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of "notnull": colDef.isNotNull = true
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of "unique": colDef.isUnique = true
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of "unique":
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colDef.isUnique = true
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# Create B-Tree index for UNIQUE
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let idxName2 = stmt.crtName & "." & col.cdName
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var bt2 = newBTreeIndex[string, IndexEntry]()
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ctx.btrees[idxName2] = bt2
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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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@@ -377,6 +570,13 @@ proc executeQuery*(ctx: ExecutionContext, astNode: Node): (bool, string, int) =
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of nkDropTable:
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ctx.tables.del(stmt.drtName)
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# Remove associated B-Tree indexes
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var toDelete: seq[string] = @[]
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for idxName, bt in ctx.btrees:
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if idxName.startsWith(stmt.drtName & "."):
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toDelete.add(idxName)
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for idxName in toDelete:
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ctx.btrees.del(idxName)
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return (true, "", 0)
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of nkBeginTxn:
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@@ -392,6 +592,24 @@ proc executeQuery*(ctx: ExecutionContext, astNode: Node): (bool, string, int) =
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return (true, "", 0)
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of nkExplainStmt:
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if stmt.expStmt != nil and stmt.expStmt.kind == nkSelect:
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var planStr = "EXPLAIN "
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if stmt.expStmt.selFrom != nil:
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planStr &= "SELECT on " & stmt.expStmt.selFrom.fromTable
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# Check if index can be used
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var indexUsed = false
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if stmt.expStmt.selFrom != nil and stmt.expStmt.selFrom.fromTable.len > 0:
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if stmt.expStmt.selWhere != nil and stmt.expStmt.selWhere.whereExpr != nil:
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let w = stmt.expStmt.selWhere.whereExpr
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if w.kind == nkBinOp and w.binOp == bkEq:
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if w.binLeft.kind == nkIdent:
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let idxName = stmt.expStmt.selFrom.fromTable & "." & w.binLeft.identName
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if idxName in ctx.btrees:
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planStr &= " (using B-Tree index on " & w.binLeft.identName & ")"
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indexUsed = true
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if not indexUsed:
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planStr &= " (full table scan)"
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return (true, "", 0)
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return (true, "", 0)
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else:
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