Allocate continuous row id for single INSERT statement

executor/insert_test.go

@@ -15,7 +15,9 @@ package executor_test
 
 import (
 	"fmt"
+	"strconv"
 	"strings"
+	"sync"
 
 	. "github.com/pingcap/check"
 	"github.com/pingcap/parser/terror"
@@ -763,6 +765,43 @@ func (s *testSuite3) TestBit(c *C) {
 
 }
 
+func (s *testSuite3) TestAllocateContinuousRowID(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec(`use test`)
+	tk.MustExec(`create table t1 (a int,b int, key I_a(a));`)
+	wg := sync.WaitGroup{}
+	for i := 0; i < 5; i++ {
+		wg.Add(1)
+		go func(idx int) {
+			defer wg.Done()
+			tk := testkit.NewTestKitWithInit(c, s.store)
+			for j := 0; j < 10; j++ {
+				k := strconv.Itoa(idx*100 + j)
+				sql := "insert into t1(a,b) values (" + k + ", 2)"
+				for t := 0; t < 20; t++ {
+					sql += ",(" + k + ",2)"
+				}
+				tk.MustExec(sql)
+				q := "select _tidb_rowid from t1 where a=" + k
+				fmt.Printf("query: %v\n", q)
+				rows := tk.MustQuery(q).Rows()
+				c.Assert(len(rows), Equals, 21)
+				last := 0
+				for _, r := range rows {
+					c.Assert(len(r), Equals, 1)
+					v, err := strconv.Atoi(r[0].(string))
+					c.Assert(err, Equals, nil)
+					if last > 0 {
+						c.Assert(last+1, Equals, v)
+					}
+					last = v
+				}
+			}
+		}(i)
+	}
+	wg.Wait()
+}
+
 func (s *testSuite3) TestJiraIssue5366(c *C) {
 	tk := testkit.NewTestKit(c, s.store)
 	tk.MustExec(`use test`)

infoschema/tables.go

@@ -2424,6 +2424,11 @@ func (it *infoschemaTable) AllocHandle(ctx sessionctx.Context) (int64, error) {
 	return 0, table.ErrUnsupportedOp
 }
 
+// AllocHandleIDs implements table.Table AllocHandleIDs interface.
+func (it *infoschemaTable) AllocHandleIDs(ctx sessionctx.Context, n uint64) (int64, int64, error) {
+	return 0, 0, table.ErrUnsupportedOp
+}
+
 // Allocator implements table.Table Allocator interface.
 func (it *infoschemaTable) Allocator(ctx sessionctx.Context) autoid.Allocator {
 	return nil
@@ -2541,6 +2546,11 @@ func (vt *VirtualTable) AllocHandle(ctx sessionctx.Context) (int64, error) {
 	return 0, table.ErrUnsupportedOp
 }
 
+// AllocHandleIDs implements table.Table AllocHandleIDs interface.
+func (vt *VirtualTable) AllocHandleIDs(ctx sessionctx.Context, n uint64) (int64, int64, error) {
+	return 0, 0, table.ErrUnsupportedOp
+}
+
 // Allocator implements table.Table Allocator interface.
 func (vt *VirtualTable) Allocator(ctx sessionctx.Context) autoid.Allocator {
 	return nil

sessionctx/stmtctx/stmtctx.go

@@ -118,6 +118,9 @@ type StatementContext struct {
 	// InsertID is the given insert ID of an auto_increment column.
 	InsertID uint64
 
+	BaseRowID int64
+	MaxRowID  int64
+
 	// Copied from SessionVars.TimeZone.
 	TimeZone         *time.Location
 	Priority         mysql.PriorityEnum
@@ -428,6 +431,8 @@ func (sc *StatementContext) ResetForRetry() {
 	sc.mu.execDetails = execdetails.ExecDetails{}
 	sc.mu.allExecDetails = make([]*execdetails.ExecDetails, 0, 4)
 	sc.mu.Unlock()
+	sc.MaxRowID = 0
+	sc.BaseRowID = 0
 	sc.TableIDs = sc.TableIDs[:0]
 	sc.IndexNames = sc.IndexNames[:0]
 }

table/table.go

@@ -168,6 +168,9 @@ type Table interface {
 	// AllocHandle allocates a handle for a new row.
 	AllocHandle(ctx sessionctx.Context) (int64, error)
 
+	// AllocHandleIds allocates multiple handle for rows.
+	AllocHandleIDs(ctx sessionctx.Context, n uint64) (int64, int64, error)
+
 	// Allocator returns Allocator.
 	Allocator(ctx sessionctx.Context) autoid.Allocator
 

table/tables/tables.go

@@ -455,9 +455,22 @@ func (t *tableCommon) AddRecord(ctx sessionctx.Context, r []types.Datum, opts ..
 		}
 	}
 	if !hasRecordID {
-		recordID, err = t.AllocHandle(ctx)
-		if err != nil {
-			return 0, err
+		stmtCtx := ctx.GetSessionVars().StmtCtx
+		rows := stmtCtx.RecordRows()
+		if rows > 1 {
+			if stmtCtx.BaseRowID >= stmtCtx.MaxRowID {
+				stmtCtx.BaseRowID, stmtCtx.MaxRowID, err = t.AllocHandleIDs(ctx, rows)
+				if err != nil {
+					return 0, err
+				}
+			}
+			stmtCtx.BaseRowID += 1
+			recordID = stmtCtx.BaseRowID
+		} else {
+			recordID, err = t.AllocHandle(ctx)
+			if err != nil {
+				return 0, err
+			}
 		}
 	}
 
@@ -947,9 +960,15 @@ func GetColDefaultValue(ctx sessionctx.Context, col *table.Column, defaultVals [
 
 // AllocHandle implements table.Table AllocHandle interface.
 func (t *tableCommon) AllocHandle(ctx sessionctx.Context) (int64, error) {
-	_, rowID, err := t.Allocator(ctx).Alloc(t.tableID, 1)
+	_, rowID, err := t.AllocHandleIDs(ctx, 1)
+	return rowID, err
+}
+
+// AllocHandle implements table.Table AllocHandle interface.
+func (t *tableCommon) AllocHandleIDs(ctx sessionctx.Context, n uint64) (int64, int64, error) {
+	base, rowID, err := t.Allocator(ctx).Alloc(t.tableID, n)
 	if err != nil {
-		return 0, err
+		return 0, 0, err
 	}
 	if t.meta.ShardRowIDBits > 0 {
 		// Use max record ShardRowIDBits to check overflow.
@@ -961,16 +980,17 @@ func (t *tableCommon) AllocHandle(ctx sessionctx.Context) (int64, error) {
 			// will be duplicated with:
 			// rowID = 0100111111111111111111111111111111111111111111111111111111111111
 			// shard = 0010000000000000000000000000000000000000000000000000000000000000
-			return 0, autoid.ErrAutoincReadFailed
+			return 0, 0, autoid.ErrAutoincReadFailed
 		}
 		txnCtx := ctx.GetSessionVars().TxnCtx
 		if txnCtx.Shard == nil {
 			shard := t.calcShard(txnCtx.StartTS)
 			txnCtx.Shard = &shard
 		}
 		rowID |= *txnCtx.Shard
+		base |= *txnCtx.Shard
 	}
-	return rowID, nil
+	return base, rowID, nil
 }
 
 // OverflowShardBits checks whether the rowID overflow `1<<(64-shardRowIDBits-1) -1`.